Spectro Acoustics 101B preamplifier

Spectro Acoustics Model 101B

Preamplifier/Equalizer

The quality of a stereo component system lies in the audiophil's choice of equipment. The major influence affecting that quality is the interaction and influence of each component on other components and the culmination of those influences on the human ear. This is where the choice is made in selecting "quality" and whether to accept a particular sound as "right"

All things considered, the perfect listening environment is still the concert hall and reproduction of music must remain subjective. However, we want control over what we hear and have the facility to change what it is that reaches our ears. In musical reproduction this function is relegated to the concepts of tonal compensation, balance and volume. The equipment corollary is the modern preamplifier; a device which offers control over the amount of sound reaching our ears and which particular source we will listen to, (whether it be a tape recording, a phonograph record or a radio broadcast). In most cases, there is the ability to change the tonal content at specifically designated frequencies.

Spectro Acoustics, in attempting to obtain maximum performance value, offers the Model 101B preamplifier/equalizer for audiophiles who want the most in flexibility and performance at a reasonable price.

The Spectro Acoustic Model 101B  in order to optimize reliability and serviceability, is designed and constructed to utilize plug-together glass-epoxy circuit boards and 100% monolithic IC circuitry for consistent performance. All controls and connections are human engineered to give simple straight forward operation. The graphic panel of the 101B is a display of exactly what's going on inside of the unit. Control is at the user's finger tips to seek the level and range of sound that achieves personal satisfaction.

The equalizer circuit for the Model 101B is a totally new type based on Spectro Acoustics gyrator synthesis techniques similar to those used in the Model 210 Graphic Equalizer. The design is a hybrid coil/gyrator type which totally eliminates distortion and hum for equalizer circuitry. The filter parameters are optimized for maximum flexibility from a five band design and as an added benefit the highest and lowest frequency bands are "shelving" type to control the response well beyond are "shelving" type to control the response well beyond the extremes of audibility. The usefulness of the equalizer circuitry is further enhanced through its complete availability to line or tape outputs, or total bypass for equalization in/out comparisons.

In phono stage, the Model 101B utilizes an isolated feedback servo op-amp phono stage with ultra-accurate adherence to the RIAA curve. This circuit provides for accurate cartridge response, increased definition of high frequencies and greater dynamic range. Internally accessible cartridge loading components can be adjusted by any qualified and authorized technician to perfectly match the cartridge load for any cartridge.

Specifications

Total Harmonic Distortion:  less than .05% at 2 volts rms output, 20Hz to 10kHz, 10 k Ω  load

Intermodulation Distortion; less than .01% at any output level below clipping, 7kHz and 60 Hz mixed 1 to 4 (SMPTE)

Noise

Phono Stage:  less than 2 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 74 dB below 10 mV reference) Better than 88 dB below full output (ASA standard "A" weighting)

High Level & EQ Stages:  less than 30 mV equivalent input noise, 20Hz to 20kHz, inputs open or shorted (S/N ratio = at least 90 dB below 1 V reference) Better than 100 dB below full output (ASA standard "A" weighting)

Frequency Response: 

Phono Stage : within 0,5 dB of true RIAA equalization, 20Hz to 20kHz, typically within 0,1 dB

High Level Inputs : within 0,1 dB of absolutely flat response, 20Hz to 20kHz, within 3 dB of absolutely flat response, 5Hz to 100kHz

Gain

Phono Stage :  40 dB at 1 kHz, phono stage alone, 50 dB at 1 kHz, phono +line amplifier (main outputs)

High Level Stage :  10 dB with Level controls set to maximum

Equalizer Stage :  Plus or minus 15 dB nominal range of adjustment, within 0,1 dB of unity gain, controls set flat

Dynamic Range

Phono Stage : Overload point is 100 mV at 1 kHz input

High Level Stage :  Overload point is 10 V at 1 khz into 10 k Ω  load

Port Impedances

Phono Units :  47 k Ω  shunted by 220 pF (internally adjustable)

High Level Inputs :  50 k Ω  shunted by 10 pF

Tape Inputs less than 600 Ω , resistive, direct coupled

Main Output :  less than 600 Ω , resistive, direct coupled

Output Capabilities

Rated Output:  2 volts rms into 10 k Ω  load, resistive

Output at Clipping :  Greater than 9 volts rms into 10 k Ω  load, greater than 5 volts rms into 600 Ω  load at 1 kHz

Protection:  Fully protected against short circuits at any output level

Power Requirements:  110 to 125 VAC, 50/60 Hz, 14 watts (Standard unit); 220 to 250 VAC, 50/60 Hz, 14 watts (Export unit)

Physical Data

Dimensions (W x H x D):  381 x 152,4 x 140 mm (15" x 6" x 5-1/2")

Optional Wood Cabinet (W x H x D):  412,8 x 184,2 x 421,3 mm

Weight :  10 pounds shipping

 

Onkyo Icon Series P-80 pre amplifier

Icon Series P-80 Network Preamplifier

 

The Icon Series

Is not only a complete renewal of Onkyo’s previous hi-hi products, but also the culmination of Onkyo’s accumulated and continuously evolving sound creation technologies and was developed to become the icon of the Onkyo brand.

 

Quality is King, and Sublime Sound is The Decree

Thanks to patented DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry), the P-80 Network Preamplifier delivers a vivid yet smooth and comfortable sound from any music source. DIDRC is a discrete signal control circuit developed to make digital sound sources such as CDs and music streaming services sound as natural as analog records. This technology has been further refined and is used in the P-80’s the analog filter of the DAC and phono amplifier circuits.

 

Input Your Gear, Connect To Your Music

Hardwire your turntable, plug in your CD player, and stream your songs with ease thanks to the Onkyo P-80’s many connectivity options. With 3 pairs of RCA analog inputs, MM/MC phono, coax, optical, USB-A (Storage Playback) and headphone inputs, you have all the flexibility your music devices need to move you.

 

Onkyo Invests in Your Modern Lifestyle

Your carefully curated playlists play well with the Onkyo P-80 Network Preamplifier. Seamlessly hardwire or cast your content from any of the following built-in platforms: Spotify Connect, TIDAL Connect, Qobuz Connectt, Amazon Music, Qplay, TuneIn, Works with AirPlay 2, Chromecast, Roon Ready

 

From Onkyo Academy: The Benefits of a Preamplifier

A preamplifier receives the signal input from your device (music source), and applies tone controls to that signal. You have more control over your audio playback in terms of bass, treble, volume, and more. When Fidelity IQ (Auto Loudness function) is turned on, the system automatically provides optimal audio playback according to any volume in conjunction with the master volume (This function operates independently of Tone Control and can be used in conjunction with Tone Control / Parameters are generated for the viewing environment using the setup microphone during initial setup). This Fidelity IQ goes beyond correcting loudness characteristics. Onkyo’s sound quality engineers adjust the frequency response to provide the most emotional sound possible, regardless of the music genre. Select your source, tweak settings to your liking – which may vary depending on the speakers you listen through, the type of audio being played, the genre of music, etc. – and customize the experience accordingly.

 

Dirac Live For The  Discerning Listener

Onkyo builds world-class products for early adaptors and tech enthusiasts. It’s what sets us apart from the rest, and the P-80 Network Preamplifier is no exception to our commitment to impress. That’s why it comes with built-in Dirac Live Room Correction. With frequency response correction (500 Hz - 20 kHz / full version is option), multiple playback modes, and more, this highly sought feature will elevate your listening experience by taking your unique system and room setup into account.

 

Specifications

Pre Amplifier Channel:   2,2 Ch

Frequency Response:  5 Hz ~ 100 kHz (+1/-3 dB)

Tone Controls

Bass :   ±10dB at 100 hz

Treble :  ±10dB at 10  kHz

Analog Audio Input:  RCA (Unbalanced) 3 Pair

Digital Audio Input:   HDMI ARC, COAX, Optical, USB-A (Storage playback)

Phono Input:  1 Pair (MM/MC)

Audio Pre Output
RCA (Unbalanced) 1 Pair

XLR (Balanced) 1 Pair

Subwoofer Output:  RCA (Preout) x 2

Headphone Output:  1/4” (6,3 mm) Jack

Setup MIC Input:  1/8” (3,5 mm) Jack

12V TRIGER Output:  1/8” (3,5 mm) Jack

Network Connectivity:  Wi-Fi, LAN; BLUETOOTH SBC, aptX, aptX HD

Network Service:  Spotify Connect, TIDAL Connect, Amazon Music, Qobuz Connect, QQ Music, Tune In, Roon Ready

Room Calibration:  Dirac Live® Room Correction

Power Consumption:  35 W, 30 W (idle), Less than 0,3 W (Standby

Dimensions (W X H X D):  435 x 135 x 355 mm (17.1” x 5.3” x 14”)

Weight:  12,0  kg

 

Lineage CP100 preamplifier

Many decades of leadership in American audio electronics.

Saul Marantz and John Curl create Lineage

Perhaps no man can be better said to represent the philosophy of excellence in audio than Saul Marantz. Many audiophiles and journalists consider him the father of high performance audio. The electronic components he created during the 1950's and 60's are considered classics - respected and in demand in the U.S., Europe and Japan.

In the 1970's, when Saul Marants was introducing the first Phased Array loudspeaker, a young electronics designer named John Curl was gaining international recognition for his innovative solid state electronics. These designs were also destined to become classics.

Some years later, Saul Marantz and John Curl have joined together in a new endeavor - one whose name, Lineage, reflects not only a distinguished history, but also a future of continued leadership in the American audio industry.

To create new classics for the 1980's and 90's, Lineage has brought together a multi-generational group of talented audio professionals. Their design brief is startlingly simple; To develop quality products of lasting value.

 

The CP100 Control Preamplifier, shown above, is the first of these new classics. The CP100 employs an innovative all-FET circuit topology and precision parts to assure true audiophile sound quality. It also offers a full complement of features, ease of operation and an integrity of construction that will provide years of musical pleasure.

Lineage components are made available through a network of experienced audio/video specialist. They are knowledgeable professionals who offer quality products, proper demonstration facilities and a commitment to after-sale service and support.

The first Lineage products will be available in late 1987. we hope that you'll take the opportunity to audition Lineage, the innovative audio company with many decades of experience.

 

Kyocera C-901 preamplifier

 

Control Preamplifier

Featuring Direct Coupling from  Front End to Output Terminals

 

Features:

Input Selector (Phono 1, Phono 2, Tuner, Aux)

Phono Selector (MC and MM cartridge)

Tape Monitor (1, source, 2)

Tape Copy (1 - 2; off; 2 - 1)

Mode (Stereo, Mono)

Muting (0, -20 dB)

Subsonic Filter (On, Off)

Bass, Mid, Treble (Detented variable)

Tone Switch (On, Off)

Bass Center Frequency (100 Hz, 50 Hz)

Mid Center Frequency (1 kHz)

Treble Center Frequency (10 kHz, 20 kHz)

Pre Out Switch (On, Off)

Inputs (Phono 1 & 2, Tuner, Tape 1 & 2, Aux)

Outputs (Tape 1 & 2, Preout 1 & 2)

Phones Jack

 

Specifications

Input Sensitivity/Impedance

Phono 1, 2 MC :  120 µV/1 K Ω

Phono 1, 2 MM :  2,5 mV/27 k Ω - 47 k Ω  - 100 K Ω

Tuner Aux, Tape 1, 2 :  150 mV/130 K Ω

Total Harmonic Distortion (20 Hz - 20 kHz)

Phono MC (1,5 V output) :  0,007%

Phono MM (13 V output) :  0,007%

Tuner, Aux, Tape (1,5 V output) :  0,007%

Tuner, Aux, Tape (13 V output) :  0,007%

Rated Output Power/Impedance

Rec Out :  150 mV/600 Ω

Pre Out :  1,5 V/22 Ω

Signal-to-Noise Ratio

Phono MC :  70 dB

Phono MM :  86 dB

Tuner, Aux, Tape :  110 dB

Frequency Response

Phono MC (20 Hz - 20 kHz) RIAA ±0,2 dB

Phono MM (20 Hz - 20 kHz) RIAA ± 0,2 dB

Tuner, Aux, Tape (20 Hz - 20 kHz) +0 -0,2 dB

Tuner, Aux, Tape (5 Hz - 100 kHz) +0 -1,0 dB

Maximum Input Level

Phono MM, MC :  1 kHz (RMS)

Maximum Output Voltage:  13 V

Tone Controls

Bass ±10 dB at 100 Hz - 50 Hz

Mid :  ±10 dB at 1 kHz

Treble :  ±10 dB at 10 kHz - 20 kHz

Subsonic Filter:  15 Hz (12 dB/oct)

Muting:  -20 dB

Power Supply:  AC 120 V, 60 Hz

Power Consumption:  80 W

Dimensions (W x H x D):  18-7/16" x 5-3/16" x 14-7/16"

Weight:  15,4 lbs

Brook Model 7 pre-amplifier

Brook Electronics Pre-amplifier Model 7

 

The audio performance afforded by unique Brook tone controls make this pre-amplifier a perfect complement to Brook Basic Models 12A and 10C, also , an ideal companion to any quality basic amplifier,… Hum well below the thermal noise of tubes, … All the features of the Brook Model 4B Pre-Amplifier, plus built-in power supply, operating from 115V, 50 to 60 cycles.

 

Specifications

Frequency Range:  with bass control set at position 4 and treble control set at position 8, volume control set at position7, overall response is within 1 dB, 15 to 30,000 cycles

Controls:  Channel Selector; Record Playback Characteristic, Bass, Treble, Volume, Pilot Light, Power Switch; Switch to cut out Automatic Bass Compensation (bass-loudness control)

Five Input Channels: 

A & B for tuners (AM, FM, TV or recorders),

Gain :  pre-amplifier only 40 dB flat

Input Impedance :  1 meg.

C &D for tuners, recorders or crystal pickups

Gain :  40 dB flat

Input Impedance :  250,000 ohms

E for magnetic, variable reluctance or capacitance pickup

Gain :  55 dB pre-amplifier only, at 1000 cycles, compensated for pickup along with Record Playback Characteristic Control

Jack EM for magnetic type or variable reluctance pickups,

Input Impedance 2 mag, shunted by 47 K loading resistor (resistor may be changed as required)

Also adapted for microphone with Record Characteristic Control set on Position1

Gain :  65 dB flat

Jack EC for Capacitance FM pickups

Gain :  55 dB flat

Jack R on rear panel:  Output for use with recorders, or Armchair dimmer, furnished with amplifier

Record Playback

Characteristic Control :  Position 1 flat for microphone input, position 2 -10 to match various types of recordings,

Bass Control :  Switch-type with 10 steps of control. Two stage R-C network. Bass may be boosted as much as 24 dB at 500 cycles without boominess. This is in addition to pickup equalization and automatic bass compensation. Bass may be cut as much as 16 dB at 50 cycles

Treble Control:  Switch-type with 10 steps of control. Two-stage R-C network. Steps 9 and 10 provide boost of 5 and 10 dB respectively at 10,000 cycles

Tubes:  1-6J7 (or 1620); 2-6SJ7's; 2-6C4's; All triode-connected : power supply tube 6X4.

The 1620 and 6j7 are identical except that the 1620's are especially selected for low noise.

The 6J7 gives a hum level entirely satisfactory for all normal applications. For supercritical use, the 1620 may give slightly lower hum.

Dimensions :  14-1/2" (wide); 9-1/8" (deep); 3-1/2" (high)

Luxurious gold-finished consolette, enhanced with highly polished solid walnut and blocks, has removable lucite escutcheon 13" x 2-3/4" to facilitate panel-mounting.

Net Weight:  10 lbs

Hafler DH-110 preamplifier

The DH-110's low noise and distortion, versatily control center is the standard bearer of the Hafler line. The DH-110 challenges comparison at any price on any criteria.

The improvements the DH-110 lends to your system are obvious the moment you start to listen. A three-dimensional image takes shape, acoustics are more accurate, voices are more precise transients are more articulate.. With the DH-110 reproduced sound becomes real.

Facilities include two magnetic phono inputs, two complete tape circuits with monitoring facilities and LED indication of monitoring mode a separate input-output loop for an equalizer or other signal processor a switchable highpass filter easy conversion to rack mounting (adapters are supplied), a front panel jack for most high impedance headphones, or for tape recording, and two pairs of audio outputs - one of which is switched by the headphone jack for private listening.

The full complementary symmetry circuit employs all discrete silicon transistors - no ICs. Precisions components hold very tight tolerances on inter-channel balance and RIAA equalization. This assures accurate phase relationships for correct spatial perspectives. An integral muting circuit eliminates turn-on and turn-off annoyances. The precision volume control ,maintains accurate balance between channels. The tone controls are effective while audibly unobtrusive but may be totally bypassed.

Less obvious significant refinements include a full power bandwidth that extends to 200 kHz, easily accommodating problem signals, a low impedance power supply; the use of low distortion low dielectric loss capacitors; silver plated contacts on the selector switches for long term noise-free operation; internal grounding of unused inputs for lower crosstalk; internal sockets for phono loading capacitors to accommodate specific cartridges; and a very wide phono acceptance level to handle the full dynamic range of the best cartridges.

 

Specifications

Phono Preamplifier Section

Rated Output:  3 V rms, 8 Hz to 105 kHz

Max. Output: 12 V rms at Rec Out

Total Harmonic Distortion :  0,0006% at 3 V rms

RIAA Frequency Response :  20 Hz - 20 kHz +0 dB  -0,25 dB

RIAA Equalization Accuracy:  30 Hz to 15 kHz +0 dB -0,1 dB

Sensitivity (1/2Volt at Rec Out) :  10 mV

Max. Input Signal (at 1 kHz):  300 mV (3 V at 20 kHz)

Gain:  34 dB at 1 kHz

Input Impedance:  47 k Ω  in parallel with 30 pF. User Adjustable. Plug in capacitors are installed to increase this to 150 pF/Phono1; 250 pF/Phono 2

Signal-to-Noise Ratio:  87 dB below 0,5 Volt output

Slew rate:  12 Volts per microseconds

Line Amplifier Section

Rated Output:  3 V rms 4 Hz to 210 kHz

Max. Output:  14 V rms, 20 Hz to 20 kHz

Total Harmonic Distortion less than 0,001%

Frequency Response:  20 Hz to 20 kHz +0 dB -0,1 dB

Sensitivity:  50 milivolts

Max. Input Signal (at 1 kHz): 14 V rms, volume control at -20 dB

Gain:  20 dB

Input Impedance:  better than25 k Ω

Signal-to-Noise Ratio:  105 dB

Slew Rate:  12 Volts /µsec

Crosstalk:  72 dB down

Separation:  better than 82 dB at 1 kHz; 52 dB at 20 kHz

Bass Control:  ±17 dB at 20 Hz (variable turnover)

Treble Control:  ±17 dB at 20 kHz (shelving at 5 kHz)

Filter Control:  25 kHz -12 dB/oct

General Specifications

Semiconductors:  30 Transistors; 3 ICs; 12 Diode; 2 LEDs

Inputs:  2 x Phono, Tuner, Aux, 2 x Tape, EPL

Outputs:  2 x Tape (buffered), 2 x Line EPL, Headphone jack

Intermodulation Distortion:  below residual of instrumentation

AC Power:  100 - 130 and 200 - 260 V, 50/60 Hz 3,5 Watts

AC Convenience Outlets:  2 switched 1 unswitched

Dimensions  (W x H x D):  17" x 3" x 8-1/2" + 1: knobs, 19" rack mounting

Weight:  10 lbs net

 

McIntosh C-30 preamplifier

The McIntosh C 30 Preamplifier

McIntosh continues research into user desires consistent with high quality music reproduction.

Engineering that is aggressively inquisitive in the search for better ways to bring these user dictated requirements to a technologically superior, innovative and clearly useful result.

Appearance design that has long life, complements the living style, is complimentary to the owner, and is made of materials, whose characteristics permit a like new always appearance.

Easy, to operate; the unique McIntosh designed panels are always easily readable in your choice of home lighting. They are obviously designed by human beings for human beings.

Manufactured of carefully specified and selected component parts that have high quality and long predicted life.

Assembled by highly trained craftspeople who are dedicated to quality, accuracy and perfection.

Thorough verification of the desired capabilities and quality of performance by constant and complete setting throughout the entire manufacturing process.

Here is the latest advanced technology instrument that adds to the already formidable McIntosh reputation.

Five separate tone shaping controls provides musical spectra tone shaping. Each control adjusts two octave band segments to satisfy your personal preference or the demands of the program material. At the detent in the center of the rotation of each control the equalizer circuits are disconnected, completely removed from the operating circuits.

 

Loudness controls in ordinary equipment are usually simple, passive circuits connected to a portion of the rotation range of the volume control. As a consequence, loudness compensation accuracy is dependent on many variables such as speaker efficiency amplifier gain and differences in input level. The C30 loudness control is continuously variable, operates independently of the volume control, and its contour is accurately modelled after the family of "Equal Loudness" curves developed by Drs. Fletcher and Munson.

Ideal volume control tracking accuracy and noise free performance are two of the considerable benefits of the McIntosh Precision Step Attenuator. It is a thirty-two step, 70 dB range control with unheard of tracking accuracy within 1 dB. The extreme accuracy is obtained through special electronically controlled resistance element trimming. The accuracy and quiet operation are maintained because the switch commutator touches only the switch contact pad and not the precision resistor elements.

Headphone loudness is adjusted using the same type of Precision Step Attenuator. The loudness of the program when using headphones is controlled by this front panel control. The control adjusts the output to the headphone jacks only and does not affect the program loudness from the loudspeakers. Then, while wearing the headphones, adjust the headphone level controls to the desired loudness level.

The appearance of a McIntosh speaker eloquently of precision, quality, premier performance and long, trouble-free life. Consider the construction and materials used in the front panel and knobs. Each constituent part is selected for long, wear-resistant life and stable attractive styling. The panel itself is select white flint glass, free from bubbles, flow marks and other faults. It is silk screened on the reverse side with thermal setting epoxy screen inks which practically become a part of the glass. Then it is built into a brightly polished and anodized frame. The knobs used are meticulously machined of solid aluminum then anodized and thermally isolated.

 

Specifications

Frequency Response:  20 - 20,000 Hz +0 -0,5 dB

Max. Voltage Output: 

Main and Tape Output :  10 V from 20 - 20,000 Hz

Line/Headphone Output :  9 V (1,3 V with 8 Ω  headphones) from 20 - 20,000 Hz

Total Harmonic Distortion :  0,007% max. 20 -20,000 Hz at 2,5 V rated output

Sensitivity

Phono :  2 mV for 2,5 V rated output (0,4 mV IHF)

High Level :  200 mV for 2,5 V rated output (40 mV IHF)

Signal-to-Noise Ratio

Phono :  90 dB below 10  mV input (84 dB IHF)

High Level :  100 dB below rated output (86 dB IHF)

Maximum Input Signal

Phono :  100 mV

High Level :  10 V

Input Impedance

Phono :  47 k Ω  and 65 pF capacitance

High Level :  22 k Ω

Voltage Gain

Phono to Tape :  40 dB

Phono to Main :  62 dB

Phono to Headphone/line :  58 dB (51 dB with 8 Ω  headphones)

High Level to Tape :  0 dB

High Level to Main :  22 dB

High Level to Headphone/Line :  28 dB

(11 dB with 8 Ω  headphones)

Equalization Control:  Variable 12 dB boost to 12 dB cut at center frequencies of 30, 150, 500, 1500, 10 k Hz

LF-HF Filter:  Flat or roll-off at 12 dB per octave below 50 Hz and above 7,000 Hz

Semiconductor Complement:  28 Bipolar Transistors; 66 Field Effect Transistors; 15 Integrated Circuits; 91 Diodes; 1 Silicon Controlled Rectifier (SCR)

Power Requirements:  120volts, 50/60 Hz , 25 watts

Weight:  8,2 kg (18 pounds) net

 

Denon PRA-1100 pre-amplifier

Stereo Pre-Amplifier

 

Specifications

Equalizer Amplifier (Phono In - Rec Out)

Input Sensitivity/Impedance:

Phono MC :  0,2 mV/100 Ω

Phono MM :  2,5 mV/47 k Ω

Phono Variable Input Capacitor:  200 pF - 600 pF

Max. Input Level

Phono MC :  13 mV/ 1 kHz

Phono MM :  160 mV/ 1 kHz

Max. Output ? Rated Output:  10 V / 150 mV

Total Harmonic Distortion :  less than 0,001% (1 kHz, 7 V output)

RIAA Deviation

Phono MC :  20 Hz - 100 kHz ±0,3 dB

Phono MM :  20 Hz - 20 kHz ±0,2 dB

Signal-to-Noise Ratio

Phono MC :  79 dB (A -weighted) at 0,5 mV Input

Phono MM :  96 dB (A -weighted) at 5 mV Input

Gain

Phono MC :  57,5 dB / 1 kHz

Phono MM :  35,6 dB / 1 kHz

Phono Subsonic Filter:  16 Hz, 12 dB/oct

High-Level Amplifier (AUX In - Pre Out)

Input Sensitivity/ Impedance:

CD, Tuner, Aux 1, 2; Tape 1, 2 :  150 mV / 47 k Ω

CD Direct :  1 V/ 10 k Ω

Max. Output/Rated Output:  10 V / 1 V

Total Harmonic Distortion :  less than 0,003% (20 Hz - 20 kHz, 5 V output)

Frequency Response:

1 Hz - 300 kHz +0,2 dB -3 dB

10 Hz - 100 kHz ±0,2 dB

Signal-to-Noise Ratio :  105 dB (A -weighted)

Tone Control:

Bass :  ±8 dB at 100 Hz

Treble :  ±8 dB at 10 kHz

Muting:  PRE Out Off and Headphones circuit muting (indication by LED)

Gain :  16,5 dB

Output Impedance:  10 Ω

General

Power Requirements:  AC 220 - 240 V 50/60 Hz

Power Consumption:  15 W

DC Output:  15 V x 2 (1 mA)

Dimensions (W x H x D):  434 x 119 x 302 mm (17-3/32" x 4-11/16" x 11-57/64")

Weight (net):  5,0 kg (11 lbs 1 oz)

 

Hafler DH-100 preamplifier

 The preamplifier functions as the control center of your component music system. It is the interface between the audio sources and the basic power amplifier. It provides appropriate switching, and adjustment of the volume, balance and tonal correction, as well as the additional amplification and frequency compensation required for magnetic phono cartridges. Given the wide choice of preamplifier designs, a price range of ten times or more, some laden with features, and others burdened with notable complexity, there is a natural tendency for you to expect that the highest performance will necessarily be achieved with the most costly designs. This need not be true. The David Hafler Company has a tradition of maintaining a very high level of quality while achieving substantial cost reductions in our products. In the DH-100 we have state of the art. Performance in a handsome unit which is very modest in cost.

Our philosophy has always been to produce maximum performance at minimum cost, offering exceptional value in every one of our designs. The ability to achieve this is based on our expectation that the merits of each product will be so well recognized that demand will enable us to produce it in substantial volume, with the attendant economies in purchasing and manufacturing. Some of the design features which contribute to this value factor are:

Elimination of frills, such as unnecessary inputs, loudness controls, and the like, while we provide all the important features

Careful component selection and painstaking distillation of each circuit to its essentials delivers unsurpassed performance.

We develop a physical arrangement which enables reliable, reproducible performance with easy low cost assembly techniques.

We expend a large amount of engineering time to make our designs conform to close standards, without the need for time-consuming adjustments.

A further benefit of these factors is that our designs can be supplied as kits with ease of assembly and assurance of success for the builder, with additional savings.

 

While the DH-100 exemplifies the "no-frills" path to ultimate economy, it is replete with subtle features which are not apparent at first, but which make a significant contribution to its superior performance:

Low impedance power supply maintains that characteristic out to the highest audio frequencies.

A delay circuit provides muting to eliminate surges and "pops" at turn-on

Unused inputs are isolated to prevent feedthrough and consequent distortion from unselected sources

Precision RIAA phono equalization and a balanced tone control circuit assure flat response.

Sufficient line output enables the use of high impedance headphones for direct listening, as an alternate to the power amplifier connection.

 

A  goal of the lowest possible distortion is axiomatic. The conventional harmonic and intermodulation distortion of the DH-100 are almost unmeasurable. But further, we determined to make some of the more obscure forms of distortion equally inoffensive. Outside of conventional audio band it is possible for signals to intermodulate, producing distortion products inside the listening range. This ultrasonic intermodulation is an insidious form of distortion that is not shown in conventional specifications. Some engineers try to reduce it by rolling off the response of the unit so that out-of-band signals are not being reproduced. Our method is to make a very wide band design which can handle high frequency signals cleanly, so that they will not create intermodulation or transient distortion which might be audible.

 

We have paid special attention to maintaining stereo separation out to the highest frequencies so that phase information remains accurate between the two stereo channels. This provides a stable and sharply defined stereo image.

In selection circuit components, we used special listening tests based on amplified bridge comparisons, so that we could identify those items which adversely affected sonic quality. This LED to the exclusive use of polypropylene and polycarbonate capacitors in the signal path, because their superior quality justified the higher cost. Like the circuit design, the parts which comprise it were selected for the most accurate sound quality attainable.

 

Specifications

Phono preamp Section

Rated Output: 3 V rms

Max. Output:  8 V rms

Total Harmonic Distortion :  less than 0,005%

RIAA Frequency Response :±0,25 dB (20 Hz - 20 kHz); ±0,1 dB (40 Hz - 20 kHz)

Sensitivity:  10 mV (for 1/2 volt at Rec Out)

Max. Input:  180 mV at 1 kHz

Gain:  34 dB at 1 kHz

Input Impedance:  47,5 k Ω  in parallel with 130 pF

Signal-to-Noise Ratio better than 100 dB (A-weighted)

Line Amplifier Section

Rated Output:  3 V rms

Max. Output:  8 V rms

Total Harmonic Distortion :  less than 0,005%

Frequency Response:  ±0,25 dB (20 Hz - 20 kHz)

Gain:  20 dB

Input Impedance:  better than 35 k Ω

Signal-to-Noise Ratio :  better than 100 dB  (A-weighted)

Crosstalk:  down 80 dB

Separation:  better than 70 dB (at 1 kHz); 55 dB (at 10 kHz)

Controls

Bass ;  ±10 dB at 20 Hz (Moving inflection type)

Treble :  ±10 dB at 20 kHz (shelving type)

General Specifications

Semiconductors:  7 ICs; 5 Diodes; 1 LED

Inputs:  Phono, Tuner, Aux, Tape

'outputs:  Record, Line

Power Requirements:  AC Supply Voltage 95 - 130 V or 190 - 260 V 50/60 Hz

Power Consumption:  less than 5 watts

AC Outlets:  2 switched

Dimensions (W x H x D):  13-9/16" x 3 " x 10"

Weight:  7 lbs net

Adcom GFP-555 preamplifier

 Preamplifier A remarkable combination of exceptional performance, flexibility and value

The GFP-555's musical performance is outstanding - by any measurement or listening criterion. For example,… one of the most satisfying preamps around in terms of overall tonal balance. You can go back to it after a few weeks and still feel it to be basically right; it reveals most associated equipment as more colored than itself.

At the same time, the GFP-555 is surprisingly affordable.

Superb construction, incorporating regulated power supplies with large filter capacitors, provides superior performance no matter how widely the musical signal or AC line voltage may fluctuate.

As for flexibility, you can listen to any source while taping from another. There's an unusual number of inputs and outputs, plus adjustable phono gain and capacitance.

Outstanding performance

The GFP-555's musical performance is outstanding - by any measurement or listening criterion - and at the same time it offers a full array of meaningful controls and features.

What's more, the GFP-555 does it all at a surprisingly affordable price. Surprising, that is, only to those who aren't yet familiar with the Adcom approach to design and performance Musical performance, in particular.

Gai path - simple and direct

The GFP-555's gain path is simple and direct from input to output. The use of a minimum number of components - each of the highest quality - means low waveform distortion and less phase shift

The gain stages employ the most innovative state-of-the-art. Linear amplifiers ever used in high fidelity components. These individually selected instrument-grade devices are in a class by themselves.

The speed of the gain stages is almost fifty times faster than CD or LP signals.  And the noise and distortion measurements are incredibly low. Direct coupling makes possible a frequency response from below 1 Hz to beyond 400,000 Hz

 

Specifications

Total Harmonic Distortion:  0,005%

Intermodulation Distortion:  0,005%

Signal-to-Noise Ratio

Phono :  better than 85 dB (re 0,5 V output)

Tuner, CD, Tape :  better than 100 dB (re 2 V output)

Tone Controls

Bass :  ±9 dB at 40 Hz

Treble :  ±9,5 dB at 15 kHz

Contour:  =6 dB at 50 Hz

Frequency Response:  1 Hz - 100 kHz ±0,1 dB

High Filter:  -2,5 dB at 20 kHz (6 dB/octave)

Low Filter :  -5 dB at 20 Hz (6 dB/octave)

Input Sensitivity for 0,5 V output

Phono High MC/MM :  0,4 mV

Phono Low MMC :  0,13 mV

High :  40 mV

Maximum Output Level :  10 volts

Input Impedance

High MC'/MM :  47 Ω

Low MC :  100 Ω

Output Impednce:  470 Ω

Phono Overload (at 1 kHz High MC/MM):  140 mV

Phono Input Capacitance:  10 pF, 175 pF, 275 pF (adjustable)

Line Voltage:  120 V 60 Hz (available in 230 V /50 Hz)

Dimensions (W x H x D):  432 x 83 x 324 mm (17" x 3-1/4" x 12-3/4")

Weight:  6,4 kg (14 lbs)

McIntosh C-100 preamplifier

Controller and Preamplifier

 

The McIntosh C100 Preamplifier/Controller is without question the finest audio preamplifier ever created. No design compromises were allowed in the quest for a preamplifier with absolute accuracy, total sonic purity and virtual elimination of distortion and audible noise. For those who have been searching for their "Last Preamplifier" your search is over.

 

Full features Remote Control

Full featured RC is included that will allow complete control of all front panel controls and switches

 

Power Control Output

A Power Control connection for convenient turn on of McIntosh power amplifiers and accessories is included.

 

Dual Chassis Design

Dual-Chassis design completely separates all power supply, microprocessor and control circuits from the pure audio circuits for total noise isolation

 

Balanced and Unbalanced Inputs/Outputs

Three balanced high level inputs, three balanced main outputs and one balanced tape output, are provided. Eight unbalanced inputs, three unbalanced outputs as well as listen and record processor loops are included.

 

Precision Tracking Volume Control

Volume levels are controlled by a microprocessor controlled logarithmic attenuator with a tracking accuracy of 0,1 dB. Levels change in 213 individual 0,5 dB steps.

 

Precision Volume Display

The front panel digital Volume display indicates the preamplifier gain in dB or percentage of available volume

 

Precision Parts

Only the finest precision 1% tolerance resistors and polypropylene capacitors are used throughout

 

Moving Coil and Moving Magnet Phono Input

Separate shielded precision RIAA phono preamplifier for low output moving coil phono cartridges, utilizes two double mu metal shielded, silver wire, step-up transformers. Precision RIAA phono preamplifier for moving magnet cartridges.

 

Ultra Low Distortion

Distortion levels of all types are less than 0,002%. Music is amplified with total transparency and accuracy

 

Specifications

Frequency Response:  10 Hz - 40,000 Hz +0 -0,5 dB

Total Harmonic Distortion :  0,002% (from 10 Hz to 40,000 Hz)

Signal-to-Noise Ratio : 

Phono :  86 dB

High Level :  100 dB

Max. Voltage Output:

Balanced :  25 V rms

Unbalanced ;  12 V rms

Output Impedance:  50 Ω 

Sensitivity

Phono MM :  4,4 mV for 2,5 V rated output (1mV IHF)

Phono MC :  100 µV for 2,5 V rated output

High Level:  450 mV for 2,5 V rated output

Input Impedance

Phono MM :  47 k Ω  (65 pF)

Phono MC :  10 Ω

High Level :  22 k Ω  (unbalanced), 44 k Ω  (balanced)

Max. Input Signal:

Phono MM :  50 mV

High Level :  5 V (unbalanced), 5 V (balanced)

Power Requirements:  100, 110, 120, 220, 230, 240 V, 50/60 Hz at 30 watts

Dimensions (W x H x D):  445 x 137 x 445 mm (17-1/2" x 5-3/8" x 17-1/2")

Weight:  31,8 kg (70 lbs)shipping