SAE Mark XVII equalizer

Solid State Stereo Octave Equalizer

Control - for many years the need to tailor program material to meet individual tastes has been apparent. Highly sophisticated multi-control systems have been available to meet these needs in the recording studio, on the rock stage and at the concert hall (places where you would find the 2700B). However, the need to control sound in the home has never fully been realized, due to limitations in present consumer designs. There were numerous requests for a modestly priced, quality equalizer to improve old or worn records, and to compensate for speaker performance and room conditions without degradation of sound. The Mark XVII is the answer to these requests, incorporating many of the same unique performance and convenience features as our professional half-octave equalizer,, the 2700B. For example, we use the same long throw oil-damped graphic potentiometers as the 2700B. We feel this offers better accuracy for spectral control and smoother operation. We also incorporate our famous L-C-R network which result in the best balance of performance, low noise, and reliability. The toroid inductors are precision wound at our factory and then hand picked for each model to offer the ultimate in performance.

Finally, the latest in output design is incorporated to ensure that the Mark XVII would affect the sound in no other way than that for which it was intended - the control of frequency response. The Mark XVII can deliver over 11V into a 10 k Ω  or greater load, assuring undistorted performance with any program material. SAE's unequalled talents show through in measurements too-both T.H.D. and Intermodulation Distortion are less than 0,03% and the noise is 90 dB below rated output. We feel that such a level of performance in an equalizer of this size and flexibilty is a true innovation in the audio industry.

 

Features

Octave Control

Twenty precision L-C-R band-pass filters offer octave control for each channel. Precision-wound toroid inductors, low-loss capacitors, and precision-tracking potentiometers result in low noise, low phase shift, and low distortion.

Dual Range

The individual frequency controls operate over a range of +8 dB for program equalization or +16 dB for more drastic modification to room or speaker response. These two ranges are front panel selectable.

Individual EQ Defeat

Front panel selection is available for the individual defeat of the equalization on either channel. This offers A-B comparison between speakers and between equalized and non-equalized program material. You may also simply defeat the equalizer for some program sources.

Output Drive

The high output voltage circuitry delivers over 11 Volts RMS into a 10 k Ω  or greater load. This allows the Mark XVII to be terminated into any unique load configuration without an incrase in distortion or current limiting.

 

Specifications

Frequency Response:  20 Hz - 20,000 Hz ±0,25 dB

Bandwidth:  3 dB down at 6 Hz and 80 kHz

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,03%

Intermodulation Distortion (at any level of rated output with any 2 mixed frequencies between 20 Hz and 20 kHz at 4/1 voltage ratio):  less than 0,03%

Signal-to-Noise Ratio :  greater than 90 dB below rated output

Rated Output:  2,5 Volts RMS

Output at Clipping:  greater than 10 Volts into 100 k Ω ; greater than 9 Volts into 10 k Ω

Input Impedance:  100 k Ω

Output Source Impedance:  400 Ω

Output Load Impedance:  10 k Ω  minimum

Insertion Loss:  less than 1 dB with controls centered

Equalizer Range:  ±16 dB or ±8 dB at : 40 Hz,  80 Hz, 160 Hz, 320 Hz, 640 Hz, 1280 Hz, 2500 Hz, 5000 Hz, 10 kHz, 15 kHz

Power Requirements:  110, 125 V AC , 50 or 60 Hz

Power Consumption:  10 watts

Dimensions (W x H x D): 432 x 146 x 178 mm (17" x 5,75" x 7")

Weight:  20 lbs (shipping)

 

SAE Mark XIV loudspeaker

The SAE Mark XIV Solid -State Electrostatic Transducer represents a dramatic advancement in the loudspeaker industry. Years of extensive research and design were required to perfect the ideal enclosure which would optimize the performance of all internal components. Only after this was achieved was the task of developing the correct drivers begun. Faithful sound reproduction was the goal while developing the Mark XIV. Each and every component part was developed expressly for the Mark XIV and is assembled within the SAE plant.

The result of this intensive program is the purest re-creation of the recorded audio signal by any device anywhere.

Low Frequency Transducer

Nominal diameter - 12,3 inches

Voice coil diameter - 4,175 inches

Voice coil material - edge wound copper ribbon

Magnetic assembly - Black anodized aluminum voice coil support to assist in transmission and dissipation of heat during high power operation

Integral heat sink in the magnet structure to assist elimination of temperature build up; double spider system for precise alignment of the voice coil form to eliminate breakage

11,25 pound cast ductile iron-magnetic structure for efficient conductance of magnet flux.

Frame - rigid 8-spoke aluminum

Compliance - non-fatiguing foam to insure linear travel

Free air electrical resonance of 18 Hz ±1 Hz

In system electrical resonance of 32 Hz ±1 Hz.

Chamber type - 3 cubic foot with acoustically suspended low-frequency driver

 

Specifications

Mid Frequency Transducers

Nominal diameter - 5.0 inches

Voice coil diameter - 1,0 inches

Magnetic assembly - 1,75 pounds

High compliance is ensured with a half-roll linear surround, drivers are acoustically suspended within their own chambers

Electrostatic Elements: Constant-charge, bipolar-radiating elements

Crossover:  All air-core copper inductors with special design audio transformers

Crossover Frequencies

Low Frequency Driver :  Adjustable to 120 Hz, 240 Hz, 4890 Hz at 12 dB/octave

Mid Frequency Drivers :  240 at 6 dB/ocave, continuously variable calibrated adjustment from 16 dB through +4 dB

Electrostatic Elements :  1440 Hz at 12 dB/octave, efficiency level adjustable from -4 dB through +10 dB, continuously variable calibrated adjustments

Solid-State Electronic Protection

The circuit is triggered by excessive voltage in relation to a particular frequency. Triggering may be caused by ±DC voltage, super-sonic or subsonic oscillations or any other amplifier malfunction; see graph. Operational mode is indicated by an amber light behind the grill cloth. A red light indicates the non-operational mode. This device also indicates the non-operational mode if it senses a malfunction within itself. Initial activation time - 5 seconds nominal; deactivation time 0,1 second nominal; reactivation time 5 seconds nominal.

Minimum Power Requirement :  100 Watts RMS per channel (recommended)

Maximum Power Input :  No limit, Electronic Protection will deactivate System with excessive wattage input

System Impedance :  8 Ω  nominal

Finish :  Oiled walnut or rosewood

Fabric :  Ebony

Dimensions (H x W x D):  1086  x 457 x 152 mm (42-3/4" x 24" x 6"

Shipping Weight:  113,6 kg (250 pounds) /pair

 

SAE Mark X loudspeaker

SAE's dedication to excellence in quality construction and innovative designs pervades all factes of the manufacturing process. Every unit is handcrafted in SAE's new environmentally controlled plant. All circuit boards, amplifier power transformers, and metal work are manufactured at the SAE facility. Features common to all SAE units include; 5% deposited-carbon resistors; military-grade glass-epoxy circuit boards; computer grade capacitors; high-grain iron-ore laminations in all power transformers, and durable, precisely machined chassis fabricated on the premises.

 

Dynamic Transducer

The Mark X is a three-way system utilizing four drivers. The major characteristics of this transducer are exceptionally wide frequency response and excellent dispersion. Low frequencies are generated by a 12" driver with a specially treated cone utilizing a half-roll foam surround. Extended cone excursion enables the Mark X to reproduce signals as low as 18 Hz - an astonishing accomplishment from a small enclosore.

Mid-frequencies are reproduced by a 5" driver in its own air-tight enclosure.

High frequencies are propagated from two 2-1/2" tweeters. One of the tweeters radiates from the rear producing desirable reflected sound. High and mid-frequency controls can be adjusted to render the system completely flexible to compensate for room acoustics.

The Mark X system is completely fuse-protected.

 

Specifications

Power Requirements:  minimum 20 Watts RMS

Power Handling:  Greater than 200 Watts RMS musical peaks. Completely fuse-protected against excessive current input.

Nominal Impedance:  8 Ω

Rear Radiation:  50% above 1440 Hz

Crossover Frequencies

High Frequency Driver :  1440 Hz at 6 dB/octave

Mid Frequency Drivers :  240 Hz at 6 dB/octave

Low Frequency Drivers :  480 Hz at 6 dB/octave

Controls

High Frequency Level :  Continuously adjustable from -7 dB at +5 dB

Mid Frequency Level :  Continuously adjustable from -16 dB to +4 dB

Dimensions (H x W x D):  635 x 368 x 305 mm (25" x 14-1/2" x 12")

Weight:  22,23 kg (49 pounds) each

Finish:  Hand rubbed oiled walnut

Base:  Model B-10 (optional)

 

SAE 3200 FM tuner

 

FM Digital Tuner

The SAE 3200 FM Digital Tuner offers the benefits of the latest circuit design while drawing upon the linear and digital technology developed for SAE's other superb FM tuner, the 8000. many of the features synonymous with SAE are present on the 3200; the precision tuning accuracy of a crystal-controlled digital readout; the low distortion and wide separation obtained with linear phase filters; the smooth, effect of side-skirt controlled muting. These features combine with others unique to 3200; precision 10-turn tuning potentiometer and varactor front-end for accurate tuning and excellent rejection of unwanted stations, direct reading LED displays for signal-strength and center-tuning. The resulting superior performance and unique simplicity of operation make the 3200 another Component for the Connoisseur.

 

Features

Electronic Front-End

This unique 4-section varactor front-end and its associated 10-turn tuning control potentiometer provides spurious response rejection of over 80 dB and IHF sensitivity of 10,3 dBf (1,8 µV)

LED Signal Strength and Center Tuning

The 5 section LED signal strength display indicates the actual signal strength received by the tuner. The 3 section LED center tuning displays center of station. When used in conjunction with the signal strength display they provide precise information necessary for proper tuning.

FM Muting

A unique side-skirt muting circuit eliminates off-channel interference and muting is "thump-free" due to stereo audio attenuators.

Antenna Inputs

Careful attention is paid to antenna termination to ensure the best signal reception possible. Inputs are provided for 300 Ω  flat lead and a special input for 75 Ω  coaxial cable.

Phase-Lock-Loop-Multiplex

This circuit is used in the reception of FM stereo, automatically locking the phase of the internal multiplex subcarrier oscillator to the incoming signal. This internal signal oscillator is not susceptible to transmission noise and has less intermodulation distortion products then the broadcasted subcarrier.

Digital Frequency Readout

Utilizing the latest LSI (Large Scale Integration) technology, four 7-segmented ruby LED's and crystal reference control the 3200 readout displays the exact station frequency, accurate to within 0,025% of the station frequency.

Linear Phase Filters

Sonically pure FM stereo requires that all signal components required for stereo must remain time aligned (in-phase). Since these components must pass through the IF filters to strip them of unwanted noise and distortion it is imperative that these filters have as little phase shift as possible. Our permanently aligned monolithic linear phase filters ensure exactly that.

 

Specifications

IHF Usable Sensitivity

Mono:  10,3 dBf (1,8 µV) at 300 Ω

50 dB Quieting

Stereo :  37,2 dBf (40 µV) at 300 Ω

Signal-to-Noise Ratio at 65 dBf

Mono :  70 dB

Stereo :  67 dB

Frequency Response:  20 Hz to 15 kHz ±0,5 dB

Total Harmonic Distortion (1 kHz)

Mono :  less than 0,15%

Stereo :  less than 0,20%

Capture ratio:  1,2 dB

Alternate Channel Selectivity:  better than 90 dB

Spurious Response Ratio:  better than 80 dB

IF Response Ratio:  better than 80 dB

AM Suppression Ratio:  better than 80 dB

Stereo Separation

At 1 kHz :  better than 42 dB

At 10 kHz :  better than 35 dB

Output:  1,5 VRMS

Dimensions (W x H x D):  483 x 133 x 89 mm (19" x 5,25" x 3,5")

Weight:  6,8 kg (15 lbs)

SAE 2200 power amplifier

 

Stereo Power Amplifier

The new SAE2200 Power Amplifier achieves the ultimate. It combines performance and value with aesthetic balance and beauty. Delivering 100 watts rms/channel from 20 Hz to 20 kHz at less than 0,05% Total Harmonic Distortion, the 2200 shares the SAE engineering heritage which includes fully complementary circuitry, high slew rate and low transient distortion. The 2200 package also includes a 15 LED/channel power display which instantly indicates the amount of power being delivered to your speakers, and because of the quality of material and components that go into every SAE, the 200 offers a Free transferable 5 year Service Contract.

 

Fully Complementary Circuitry

The 2200 is completely balenced from input to output utilizing full complementary dual-differential inputs, full complementary drivers and full complementary output stages. This design approach offers inherently low steady-state or transient distortion while assuring accurate reproduction of complex musical waveforms.

 

LED Power Display

This display can instantly inform you of the power output to your speakers, channel imbalance and other information pertinent to the proper performance of your system. Utilizing 15 light Emitting Diodes per channel the amplifier's average power (peak responding) is constantly displayed from 20 mW to full rated power. Amplifier overload is also indicated. The circuit is analog in nature and displays power output in 3 dB increments over its full range, making it the most accurate indicator of its type available in the industry today.

 

Amplifier Protection

Three means of circuit protection are included in the 2200;

-A VI limiter which senses load impedance below 2 Ω  without being affected by reactive loads (i.e. electrostatic speakers) which are rated at 4 Ω  or greater

-A thermal cutout device shuts down the amplifier should the heatsink reach an abnormal high temperature

-An AC line fuse for overall protection

 

Loudspeaker Protection

Should subsonic pulses or ±DC Voltages, which could damage your speakers, appear at the amplifiers outputs, a relay circuit will automatically disconnect the speakers from the amplifier. The circuit is also used during turn-on/off to prevent annoying transients. This relay circuit incorporates many features unique to SAE products, the most important of which alleviates high frequency distortion developed by the relay due to "contact diode effect"

 

Plug-in Board Design

Easily accessible input-drive, relay-power, and meter boards make the 2200 consistent in performance from one amplifier to another in production, and simple to service.

 

Monocoque Construction

Utilizing technology developed in our other amplifier designs, the 2200 mechanical package is constructed in the form of a box, offering structural rigidity and integrity, plus high strength to weight coefficient,

 

Premium materials

Only the finest materials have been used in the construction of the 2200. among the components used you will 5% carbon deposit resistors throughout, military grade glass-epoxy circuit boards and high-grain iron-ore laminations in the transformer. These efforts to use quality materials throughout insures that the 2200 will deliver superior performance and reliability in any application.

 

Precision Construction

No effort has been spared in taking these raw materials to manufacture the highest grade audio components available. It was because of this goal that our 36,000 sq,ft, primary production facility was built. This plant was designed exclusively for the manufacture and assembly of audio components. Further, critical parts unique to SAE products, such as metal work, toroid inductors and circuit boards are produced at our facilities. As a testimonial to SAE thoroughness, our metal shop fabricates all parts with a tolerance of 0,005 in (,013 cm) for proper fit. All front panels are hand brushed for proper aesthetic appearance, and all aluminum parts are mil-spec anodized for long life and easy upkeep. This attention to detail is the hallmark of SAE Components.

 

Specifications

RMS Continuous Power Output per Channel (20 Hz - 20 kHz, both channels driven into 4 or 8 Ω ):  100 Watts at 0,05% T.H.D.

Total Harmonic Distortion (from 20 Hz to 20 kHz at 250 mW to rated power into 4 or 8 Ω ):  0,05% max

Intermodulation Distortion:  0,05% max.

Frequency Response at Rated Power:  20 Hz - 20 kHz ±0,25 dB

Noise:  Greater Than 100 dB below rated power

Transient Response of Any Square Wave:  2,5 microseconds rise and fall time

Slew Rate:  40 Volts/microsecond

Stability:  Unconditionally stable with any type of load or no load including full range electrostatic loudspeakers

Damping Factor:  150 Min (100 Hz)

Input Sensitivity:  1,5 Volts RMS

Input Impedance:  50 k Ω

Overload Protection:

Low impedance electronic-sensing circuit limits with output current below 2 Ω  without limiting with 4 Ω  or higher (or reactive Loads)

Thermal sensing of inadequate ventilation.

Loudspeaker Protection:

Relay circuit protects loudspeakers from low frequency oscillations and plus or minus DC output.

Five second turn on disturbances

Power Requirements:  110 - 120 V, 50 /60 Hz. 75 Watts at idling to 600 Watts at rated poer

Dimensions (W x H x D):  483 x 133 x 21,6 mm (19" x 5,25" x 8,5")

Weight:  11,4 kg (25 pounds) shipping

SAE Mark XXVIIB equalizer

 

Stereo Half Octave Equalizer

The SEA Mark XXVIIB is a highly sophisticated frequency modification system that compensates for room acoustic, balances speaker response, selectively filters noise, equalizes sound for recording, induces stereo on mono program sources and aids in solving most reproduction problems.

Twenty low-noise, low-distortion band pass filters per channel  are provided where each filters center frequency is separated by one-half octave. The filter range effectiveness is selectable at either ±8 dB max or ±16 dB max. Grain or attenuation on the individual filters are independently controlled by calibrated professional slide potentiometers.

Further flexibility is offered in normalizing room acoustics with the inclusion of a "pink Noise" generator. This generator offers the flexibility of calibrating your system for minimum frequency distortion, as well as checking for proper speaker phasing and energy balance. Utilizing our professionally proven precision wound toroid inductors in the classic L-C-R configuration, the mark XXVIIB provides uncompromising performance with low noise (greater than -100 dB) and low harmonic and Intermodulation Distortion Distortion (0,02 T.H.D. and 0,02 Intermodulation Distortion). The full complementary output circuit offers adequate drive for any equipment the Mark XXVIIB will interface with in home or professional applications.

 

Specifications

Frequency Response:  20 Hz - 20,000 Hz ±0,25 dB

Bandwidth:  3 dB down at 6 Hz and 80 kHz

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,02%

Intermodulation Distortion:  less than 0,02%

Signal-to-Noise Ratio :  greater than 100 dB below rated output

Rated Output:  2,5 Volts RMS

Output at Clipping:  greater than 12 Volts into 100 k Ω ; greater than 8 Volts into 600 Ω

Input Impedance:  100 k Ω

Output Source Impedance:  150 Ω

Output Load Impedance:  600 Ω  minimum

Insertion Loss:  less than 1 dB with controls centered

Equalizer Range:  ±16 dB or ±8 dB at 20 Hz, 40 Hz, 60 Hz, 80 Hz, 120 Hz, 160 Hz, 240 Hz, 320 Hz, 480 Hz, 640 Hz, 960 Hz, 1280 Hz, 1800 Hz, 2500 Hz, 3700 Hz, 5000 Hz, 7500 Hz, 10 kHz, 15 kHz, 20 kHz

Power Requirements:  110, 125 V AC , 50 or 60 Hz

Power Consumption:  50 watts

Dimensions (W x H x D): 432 x 222 x 178 mm (17" x 8,75" x 7")

SAE Mark VIII tuner

FM Digtal Tuner

The mark VIII Digital Stereo Tuner sets new standards for FM quality at a moderate price. Utilizing the newest linear and digital technology, the Mark VIII has been designed to achieve broadcast quality reception with outstanding reliability. Based on monolithic linear-phase filters and phase-locked-loop stereo MX, the Mark VIII is permanently aligned to maintain minimum distortion and maximum interference-rejection characteristics,

An LED digital-readout display guarantees the precise logging of stations. This readout system is crystal referenced with an accuracy of 0,004%. Accurate tuning is further pinpointed by an illuminated dual metering system indicating both relative signal strength and center-of-channel tuning.

The purist will be more than satisfied by the crystal-clear reception, the wide-open stereo separation, the precise smooth operation, and the obvious excellence of engineering and construction.

 

Features

LED Display:  Four 7-segmented ruby LEDs constantly display the exact station frequency received. Extremely rapid and smooth tuning is provided by the balanced 17-oz flywheel.

Meters:  An illuminated two-meter system facilitates the precise station tuning desirable for optimum reception. One meter indicates the relative signal strength of the station on a logarithmic scale while the other defines center-of-channel.

Front End:  The use of five-gang variable capacitor

3 MOSFET:  RF front end results in a spurious response rejection of over 100 dB and an IHF sensitivity of 1,6 µV

IF Filters:  Eight permanently-aligned, linear-phase monolithic IF filters assure 120 dB alternate -channel selectivity while enabling harmonic and intermodulation distortion throughout the pass band.

Limiters:  Seven cascaded differential-amplifier IC limiters achieve 100 dB rejection and high impulse noise rejection

Stereo MX:  PLL circuitry incorporated in a single IC automatically locks the phase of the MX subcarrier oscillator to the incoming signal which generates fewer intermodulation distortion products when listening to stereo

De-Emphasis Selector:  A push-button on the front panel selects either 75 µsec standard FCC de-emphasis or the recently adapted 25 µsec de-emphasis used with broadcasts including special noise reduction systems

MX Switching:  When an MX station is received, a computer-logic circuit automatically switches reception to stereo indicated by a front-window LED. This circuit automatically triggers reception back to mono when less than 4 µV of signal strength is present. A front-panel "Stereo Only" push button selects circuitry which locks out all reception other than stereo stations.

Muting:  An ingenious station-skirt muting circuit eliminates off-channel interference. With the Mark VIII, muting is "thump-free" due to FET stereo audio attenuators. A two-position switch selects the threshold signal-strength level which will activate the mute circuitry. The most sensitive position has been factory adjusted at 2 µV for minimum station rejection.

 

Specifications

IHF Sensitivity:  1,6 µV

Total Harmonic Distortion (1 kHz):

Stereo :  less than 0,20%

Mono :  less than 0,15%

Noise:  70 dB below 100% modulation

Capture ratio:  1,5 dB

AM Suppression:  100 dB

Spurious Response Rejection:  100 dB

Image Rejection:  100 dB

Alternate Channel Selectivity:  120 dB

Stereo Separation:  45 dB at 1 kHz; 35 dB at 10 kHz; 30 dB at 15 kHz

Frequency Response;  20 Hz - 15 kHz ±0,5 dB

RF Drift:  less than 15 kHz (±0,05%)

Rated Output and Load Impedance:  1,2 V RMS at 1500 Ω  min.

Muting:  60 dB at 1 kHz with two step threshold control

Antenna Inputs:  300 Ω  balanced and 75 Ω  unbalanced

Tuning Aids:  4 digit 7-segment LED readout, logarithmic signal strength meter, channel-center meter

Circuitry:  3 MOS FET RF, 2 stage RF amp,; 5-gang var. Cap.; 7-stage diff. Amp. Limiter ratio detector; PLL MX , 19 kHz and 38 kh IC filters, FET muting

Semiconductor Complement:  18 ICs; 31 Transistors; 12 Diodes

Dimensions (W x H x D):  483 x 133 x 267 mm (19" x 5,25" x 10,5")

Weight (Shipping):  10,5 kg (23 pounds)

SAE 2900 pre-amplifier

 

The SAE2900 Preamplifier-Equalizer presents a unique combination of sonic excellence and sophisticated system control. Carefully designed to compliment any system, the 2900 contains many attributes and features that confirm its truly exceptional value. These include the Parametric Equalizer, which ensures precise program tone control, and a multiple tape monitor/ copy/EQ system, which offers maximum useability of all tape facilities. Even though the 2900 has this comprehensive system of input, tape, tone, and output control, sonic excellence is still the primary concern at SAE. Our new ultra low distortion phono and line circuits have been carefully developed to provide the clarity and definition that establish the 2900 as still another of SAE's Components for the Connoisseur.

 

Features:

Phono Circuit

The most critical single component of any preamplifier is the phono section. Our multi-stage design ensures that all active devices will operate well within their design parameters. This careful attention to linear area operation minimizes any distortion or slewing problems. Further, active devices for this stage are hand selected for optimum performance. The result of these efforts? A circuit that delivers optimum performance from any of the fine phono cartridges available.

Parametric Equalizer

This unique tone control system is the result of years of extensive research into the purpose and uses of tone networks. With the parametric you now have the flexibility to precisely contour the tone network to create any desired effect. Every effect, from conventional wide-band bass and treble, to continuously variable notch filters, or virtually anything in between, is at your fingertips. This system, considered the standard of the recording industry , is now available to you in the 2900

Taping Facilities

Tape circuits and their uses have received careful scrutiny during the 2900's development. The end product of this scrutiny includes provisions for 3 tape machines or other devices and the ability to monitor any of these circuits. Now you can copy from any tape circuit to another tape circuit, and while copying you can monitor either machine or another source. Besides these capabilities, the following features are provided to further extend the 2900's tape capabilities.

Tape EQ.

Now you can create your own special effects, or overcome program problems. With the Tape EQ feature, our unique Parametric tone circuit can be switched between the source you wish to record, and your tape machine. Creation of background music or car stereo tapes is a simple matter with the 2900.

Filters

The 2900 provides two low frequency filters for optimum bass control. The first is at 30 Hz, designed to remove rumble and other subsonic phenomena that may compromise musical quality. The second filter operates at 100 Hz, to correct low bass accentuated by room characteristics, speaker placement and program material. To increase their effectiveness these filters are combined in the EQ group. This allows them to be switched to before or after the tape circuits along  with the Parametric. Being able to switch the filters ahead of the tape circuits ensures that rumble and other subsonic problems that may distort the recordings you wish to make will now  be removed.

 

Specifications

Total Harmonic Distortion (at any level to rated output from 20 Hz to 20 kHz):  less than 0,01%

Intermodulation Distortion (at any level to rated output with any two mixed frequencies between 20 Hz and 20 kHz at a 4/1 voltage ratio):  less than 0,01%

Rated Output:  2,5 Volts RMS

Phono

Frequency Response (RIAA Equalized):  20 Hz to 20 kHz ±0,25 dB

Signal-to-Noise Ratio (20 Hz to 20 kHz. Ref. 10 mV input at 1 kHz):  greater than 75 dB

Input Overload (at 1 kHz):  greater than 150 mV

Gain:  35 dB (to tape out); 60 dB (to pre out)

Line

Frequency Response:  20 Hz to 20 kHz ±0,25 dB

Sn (20 Hz to 20 kHz. Ref. 2,5 V RMS out)"  greater than 95 dB

Maximum Output (10 k Ω  load):  9 Volts RMS

Minimum Load:  600 Ω 

Gain:  25 dB

Power Requirements:  110 - 125 V AC, 50 -60 Hz

Power Consumption:  25 watts

Dimensions (W x H x D): 

Front Panel (W x H): 483 x 133 mm (19" x 5,25")

Chassis (D):  89,9 mm (3,5 ") excluding knobs and connectors

Weight:  4,08 kg (9 lbs)

 

SAE 2500 / XXV power amplifier

Solid State Power Amplifier

At  the very top of our amplifier line are the Mark 2500 (XXV) Professional Power Amplifier , with 300 watts per channel, min. RMS into 8 Ω  at less than 0,05% Total Harmonic Distortion , both channels driven, 20 Hz to 20 kHz), these amplifiers represent years of sound reinforcement experience. They are offered in our traditional satin-gold and black version (Mark XXV) for home music systems, and the professional version (Mark 2500) complete with black rack-mountable front panel and custom handles. They are easily transported since they weigh less than sixty (60) pounds each.

Along with the fully complementary input circuitry designed into all SAE amplifiers, a unique Parallel-Series-Output circuit utilizes 16 output devices and combines the inherent advantages of both parallel and series connected output stages.

Unit-to-unit repeatability, ease of service, and minimal wiring are the benefits accuring from plug-in drive, input, and relay boards. A massive heat sink of 1/8" aluminum, and built-in forced-air cooling ensure cool operation under the most demanding power and load conditions.

Amplifier Protection

Four means of protection are included: Avolt/amp limiter which senses load impedances below 2 Ω  (without being affected by reactive loads such as electrostatic speakers which are rated at 4 Ω  or higher). A thermal cut-out device  for sensing  of abnormal heat-sink temperature, 4 B-supply fuses, and an AC-line fuse.

Circuitry

The Mark 2500 (XXV) are completely balanced from input to output utilizing full complementary double differential inputs, complementary drives and full complementary series connected output stages. Eight output devices per channel (in paralll/series) are utilized for higher than normal safe-area operation. The output devices are run so conservatively that failure is improbable.

Feedback Level Controls

This type of level control assures a constant input impedance of 50  kohm and reduces the noise figure to less than -100 dB below rated output at all positions.

Meters

The meters in the Mark 2500 (XXV) are direct power reading in Watts. They are extremely useful and easy to read requiring no conversion charts. A dB reference is provided for professional applications. In conjunction with the range switch, they cover output levels from 20 mW to over 400 Watts

Plug-in Board Design

Easily accessible input, drive , and relay boards make the amplifiers both simple to service and consistant in performance from one amplifier to another in production. All boards are constructed with military-grade, FR-10 glass-epoxy material to ensure circuit integrity.

Loudspeaker Protection

In case of subsonic pulses or ±DC outputs the amplifier incorporates a relay activated disconnect circuit, which will automatically disconnected the loudspeakers from the amplifier. Used also during turn-on prevent annoying turn-on transients, this dual relay circuit incorporates features unique to SAE products. The most important of these alleviates high frequency distortion developed by the relay due to "contact diode effect"

Power Supply

The engineering goal was to develop a transformer which was small in size yet have a greater copper-to-iron ratio resulting in better regulation. This was achieved by using thicker square-section copper windings and special laminations which  have extended window openings effecting lower heat generation and greater efficiency. This transformer which is manufactured within the SAE plant is coupled to 4 computer-grade capacitors totaling 40,000 microfarads. This combination creates a power supply which will very no more than 10% from no load to full load.

Forced Air Cooling

A quiet, high-output integral fan provides the necessary cooling for continuous operation under demanding situations or confined installations. The Mark 2500 is equipped with an extra high-speed fan.

Specifications

Continuous Power Output per Channel (20 Hz -20 kHz both channels driven, 8 Ω , RMS min.):  300 Watts at 0,05% (T.H.D)

45Continuous Power Output per Channel (20 Hz -20 kHz both channels driven, 4 Ω , RMS min.):  450 Watts at 0,1% (T.H.D)

Total Harmonic Distortion (from 20 Hz to 20 kHz at 250 mW to rated power)

 at 8 Ω :  0,05% Max.

 at 4 Ω :  0,1% Max.

Intermodulation Distortion (from 250 mW to rated power at 8 Ω  with any 2 mixed frequencies between 20 Hz to 20 kHz at 4/1 voltage ratio):  0,05% Max.

Frequency response (at rated power):  20 Hz - 20,000 Hz ±0,25 dB

Noise:  greater than 100 dB below rated power

Transient Response of any Square Wave:  2,5 microseconds rise and fall time

Slew Rate:  40 Volts per microsecond

Stability:  unconditionally stable with any type of load or no load inclding full-range electrostatic loudspeakers

Damping Factor:  150 Min (100 Hz)

Input Sensitivity:  1,84 V RMS for rated output at 8 Ω

Input Impedance:  50 k Ω

Semiconductor Complement:  46 Transistors, 49 Diodes

Overload Protection  

Low impedance electronic-sensing circuit limits with output current below 2 Ω  without limiting with 4 Ω  or higher (or reactive loads)

Thermal sensing of inadequate ventilation

Internal B+, B- suppy fuses

Loudspeaker protection

Relay circuit protects loudspeakers fom low frequency oscilations and plus or minus DC output. Five second turn on/off delay eliminates on/off disturbances

Power Requirements:  110 - 125 V, 50/60 Hz 100 watts at idling to 1100  watts at rated output

Dimensions (W x H x D):  483 x 178 x 400 mm ( 19" x 7" x 15,75") excluding handles controls, and connections)

Weight (Shipping):  30,9 kg (68 pounds)

Options:  Walnut Cabinet WC-25

SAE 5000 noise reduction system

Impulse Noise Reduction System

Ever since the invention of the recorded disc, annoying "clicks" and "pops" caused by scratches, static, and other imperfections, have consistently disturbed the listening pleasure of mysic lovers. Now, SAE introduces the unique model 5000, an Impulse Noise Reduction System which eliminates those unwanted sounds with no adverse effect on the quality of the recorded material.

This break-through in electronic circuitry is so demonstrably effective, that the SAE 5000 is destined to beacome an essential part of any sound system.

The SAE 5000 is compact and sleek, built to SAE's exacting standards, and ready to enhance the performance of any system, from the standard receiver/turntable combination to the most sophisticated audiophile components.

Before the technological break trough achieved by the 5000, there were many records that offered less than ultimate performance and some which were rendered virtually unlistenable due to the presence of impulse noise. Impulse noise is generated by static discharge, record blemishes or accumilation of dirt, and is often referred to as "clicks"  and "pops". Now, with the 5000, most of these problems can be overcome. Many virtually lost recordings can be played again with their fidelity unnamed by impulse noise. Ofcourse, unblemished recordings can be played without being adversely affected by the 5000. only sounds which are detected as impulse noise are eradicated. All else remains. Old recordings, even 78 rpm's may be rejuvenated by our new system.

The circuitry in the SAE 5000 is the result of extensive research and evaluation by its inventor, Jack Sacks, into the field of impulse noise.

At the start of research a careful statistical analysis was made of impulse noise and those properties which are unique to it. From this information a logic circuit was developed for the 5000 which constantly monitors the music, searching for those unique parameters which  indicate the presence of impulse noise. Upon detection of the presence and duration of the offending impulse, which is accomplished by examining the shape of the "spike", and other parameters, the noise removal circuit comes into play which deletes pnly the damaged segment from the sound sequence. Because the duration of this impulse noise is usually so minute, (less than one thousandth of a second), it is possible to extrapolate forward a tiny segment from the music information immediately preceding the gap and thus maintain total continuity and integrity at the same time. This technique is undetectable to the ear and does not adversely affect the frequency response, dynamic range, or spectral balance of the music. The system remains passive and "transparent" at all times, doing its job only when called upon by the detection of unwanted noise.

The SAE 5000 has simple and effective controls. The principal control is a threshold adjustment which varies the sensitvity of the detection circuit. Different record characteristics may require some sensitivity adjustment.

There is a system defeat button which allows the Impulse Noise Reduction (INR) circuit to be bypassed electrically. A tape monitor switch and rear mounted jacks reconnect the tape monitor circuitry used to hook up the 5000.

Finally, the incredible effectiveness of the INR system can be demonstrated by activating the Invert switch. This action reverses the active circuitry and you  are now able to hear Only the noise your system eliminates while in the operating model.

Specifications:

Total Harmonic Distortion (at any level to rated output from  20 Hz to 20 kHz):  less than 0.1%  Intermodulation Distortion (at any level or rated output with  any 2 mixed frequencies between  20 Hz to 20 kHz at 4/1 Voltage Ratio):  less than 0.1%

Signal-to-Noise Ratio:  greater than 90 dB (below rated output)

Rated Output:  2.50 Volts RMS

Frequency Response:  ±1 dB (20 Hz to 20kHz)

Output at Clipping:  greater than 9 Volts into 10 K Ω  
Input Impedance:  75 K Ω 

Output Source Impedance:  500 Ω 

Output Lead Impedance:  600 Ω  (minimum)
Insertion Loss:  less than 1 dB

Power Supply / Consumption:  110-125 VAC, 50 Hz to 60 Hz / 7 watts

Dimensions (W x H x D):  10.75" x 3"  x  9.25"

Shipping Weight:  8 Ibs.

Rack Mount Kit available