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

 

Musical Fidelity X-P100 pre amplifier

 

X-P100 remote control Class A preamplifier.

The X-P100 is a new model based on our innovative and now very highly regarded Nu-Vista valve preamp but using Field Effect Transistors in place of the Nuvistor valves used in that model.

These transistors were carefully selected from the great many alternatives we tested because of their close similarity in both measured performance and sonic fingerprint to the 6CW4 Nuvistor. We feel that the X-P100 offers a very similar level of sonic fidelity to the Nu-Vista but at the reduced cost afforded by the choice of FET devices.

The X-P100 preamp also features full remote control and a high quality discrete MM phono stage.

 

External Power Supply and  Setting Up

The X-P100 is supplied with an external power supply which is connected to the main unit via an umbilical lead terminated in an XLR/Cannon type plug. This lead should be connected to the socket on the back of the X-P100 main unit.

 

Connections

All connections should be made with the power OFF.

The X-P100 has 5 line level inputs - CD, Tuner, Aux1, Aux2 and Tape, plus an MM phono input. All line inputs are electrically identical and are suitable for use with any source component with an output voltage in the hundreds of millivolts (mV). This includes CD players, tuners, tape machines and the audio outputs of video recorders, televisions, DVD and Laser Disc players etc.

The high quality phono input caters for turntables fitted with a Moving Magnet type cartridge or other cartridges with an output voltage in the range 1 to 5mV.

 

Tape Recording

The X-P100 has a single tape circuit with facilities for off-tape monitoring with 3-head cassette decks.

Connection of your tape machine to the X-P100 should be as follows. The tape machine's Tape/Line outputs go to the X-P100's 'Tape' input sockets. The tape machine's Tape/Line inputs go to the X-P100's 'Tape Record' output.

To record simply select the required source with the source selector knob on the front panel. The selected source will now be sent to the 'Tape Record' output for recording by the attached tape machine.

 

Remote Control

The X-P100 features Infra Red remote control of volume, input selection and mute functions via the supplied remote control handset. The Infra Red receiver is the small red lens marked I.R. situated on the front panel, it is a good idea to place your X-P100 such that there is an unobstructed line-of-sight to this lens from around your listening room.

 

Specifications:

Inputs:  5 Line, MM phono

Total Harmonic Distortion:

less than 0.007% (20 Hz - 20 kHz unweighted)

Less than  0.004% (20 Hz - 20 kHz ‘A’ weighted)

Frequency Response:  20 Hz - 20 kHz ±0.2 dB

Signal-to-Noise Ratio

MM Phono:  better than 72 dB unweighted

MM Phono :  better than 78 dB 'A' weighted

Line : better than  81 dB unweighted

Line : better than  90 dB ‘A’ weighted

Dimensions (W x H x D)  230 x 110 x 315mm, Width and height include feet

Power Consumption: 20 watts (maximum)

Standard accessories:

Remote control handset

X-P100 power supply unit

IEC type mains lead

2 x batteries (AA, SUM-3, CR6)

Hafler DH-101 preamplifier

The Hafler DH-101 is the control center of your high fidelity system. 

Its extremely low distortion and noise level provides very accurate control of the following functions:

Preamplification and equalization for such sources as tape recorders, tuners, and the like;

Control of tonal balance of all signals;

Adjustment of volume level and balance;

Switching facilities for all signal sources;

Tape copying facilities and monitoring capability while tape recording.

Special features:

Lowest distortion from phono input to preamp output

Extraordinary pulse and square wave response

Widest power bandwidth

Highest phono input acceptance level  - 1,8 volts at 20 kzh

High slew rate both phono section and tone control stage

Fast rise time

Human engineered with self-indicating push buttons

All discrete transistors, no ICs in audio circuits

Tape dubbing facilities

Provision for internal moving coil pre-preamp

Sub-sonic filter meets latest RIAA standard

Easiest kit construction

No cartridge interaction

Precision RIAA equalization all push pull design

Regulated power supply

International power transformer

Complete tape record, monitor, and duplicate facilities

Feedback tone controls with defeat switch

Prefabricated and pretested circuit modules carry all components, operating controls, and switches

Finest quality components including tantalum capacitors and film resistors where useful

Provision for patching external equipment such as a noise reduction unit or graphic equalizer

 

 

Specifications

Phono Preamp Section

Type:  Discrete transistor (No integrated circuits)

Rated Output:  3 volts, 10 Hz to 100 kHz

Max. Output:  7 volts, 20 Hz to 20 kHz

Total Harmonic Distortion :  less than 0,0006% at 1 kHz and 3 volts out

Slew Rate: 12 volts per microsecond

Phono Overload:  180 mV at 1 kHz ; 1,8 V at 20 kHz

Phono Cartridge Interaction at 20 kHz:  Unmeasureable

Hum and Noise:  86 dB below 10 mV, 1khz input (A weighted)

Frequency Response:  complies with RIAA sepcification 40 Hz to 15 kHz ±0,5 dB

Hi-pass Filter:  In accordance with proposed RIAA revision

Gain:  34 dB at 1 kHz

Input impedance:  47 k Ω  in paralel with 250 pf

Tone Control Section and High Level Amplifier

Type:  Discrete transistor (no integrated circuits)

Rated Output:  3 volts 10 Hz to 100 kHz

Max. Output:  7 volts, 10 Hz to 100 kHz

Total Harmonic Distortion less than 0,001%, 20 Hz to 20 kHz at rated output

Slew Rate:  12 volts per microsceond

Rise Time:  2 microseconds

Hum and Noise:  90 dB below 1 volt (A weighted)

Frequency Response:  20 Hz to 20,000 Hz +0 dB,  -0.25 dB

Gain:  20 dB ±1 dB

Input Impedance: better than 25 k Ω 

Bass Control: 

Type:  Moving Inflection with variable turnover frequency

Amount:  ±12 dB at 50 Hz

Treble Control:

Type:  shelving with fixed turnover frequency

Amount;  ±10 dB at 20 kHz

General Specifications

Semiconductors:  28 Transistors; 4 Diodes; 1 LED; 2 ICs power supply regulators

Inputs:  Two phono, tuner, auxiliary; two tape recorders

Outputs:  Two tape (buffered) and one profram

Provision for patching in external equipment

Controls: Volume, balance, bias, trebl, tape dubbing, input switching, mono-stereo, tone control engage, power on-off

Intermodulation Distortion:  at normal levels of operation, IMD, whether SMPTE or CCIF, from phono iput to preamplifier output is below the residual of currently available instruments

AC Convenience Outlets:  2 switched; 5 amp continuous, 72 amp surge; 2 unswitched, 5 amp continuous

Power Requirements:  AC 100/120/200/220/240 50/60 Hz

Power Consumption:  3,5 watts

Dimensions (W x H x D):  350 x 82,5 x 215 mm (13,75" x 3,25" x 8,5")

Weight: 3,6 kg (8 lbs )

 

Technics SU-C1000 preamplifier

Stereo Control Amplifier

 

Specifications

Total Harmonic Distortion (Vol. Max 20 Hz- 20 kHz):  0,01%

Input Sensitivity/Impedance

Phono MM :  2,5 mV/47 k Ω

Phono MC :  170 µV/220 Ω

Tuner, CD, Aux, Tape 1, 2/DCC :  200 mV/22 k Ω

Phono Maximum Input Voltage (1 kHz, RMS)

Phono MM :  130 mV (IHF '66)

Phono MC :  10 mV (IHF '66)

Signal-to-Noise Ratio

Phono MM :  78 dB (86 dB, IHF '66)

Phono MC :  64 dB (S _ 260 µV, 66 dB IHF '66)

Tuner, CD, Aux, Tape 1, 2/DCC :  91 dB (100 dB, IHF '66)

Frequency Response

Phono MM :  RIAA standard curve ±0,8 dB (30 Hz - 15 kHz)

Tuner, CD, Aux, Tape 1, 2/DCC :  3 Hz - 80 kHz (+0 _3 dB);  20 Hz - 20 kHz (+0 -0,3 dB)

Tone Controls

Bass :  50 Hz +10 dB -10 dB

Treble :  20 kHz +10 dB -10 dB

Output Voltage

Tape 1, Tape 2 Rec Out :  200 mV

Pre Out :  1 V

Channel Balance (Aux, 250 Hz - 6,3 kHz):  ±1 dB

Channel Separation (Aux, 1 kHz) :  50 dB

Power Consumption:  10 W
 Power Requirements:  AC 120 V, 230 - 240 V, 50/60 Hz

Dimensions (W x H x D):  430 x 69,3 x 307 mm (16-15/16" x 2-23/32" x 12-3/32")

Weight:  3,3 kg (7,3 lb)

Conrad-Johnson PV12 preamplifier

Vaccum Tube Pre-amplifer

The PV12 draws on two decades of research at Conrad-Johnson into the reproduction of recorded music. The result is a line-stage preamplifier with a remarkable ability to recreate the dynamics, textures, tonalities, and ambience of live musical performances. With the PV12, we believe that you will experience the excitement of discovery in hearing more from your favorite recordings than ever before.

The audio circuit of the PV12 uses six vacuum tubes of three different types: two 12AX7 (V1 and V2), one 5751 (V3) and three 12AU7 (V4, V5 and V6).

Absolute Phase

Musical notes are heard through the ear’s response to waves of alternating rise and fall of air pressure. Musical ransients are almost exclusively positive: that is, the initial effect is a rise in pressure. The ear is capable of distinguishing these positive transients from the musically unnatural alternative of a negative transient (an initial fall in air pressure).

In terms of your stereo system, these transients are created by your loudspeakers. If the speakers respond to musical transients by first moving out, they are creating a rise in pressure, and the system is said to be "phase correct". If they respond by moving in, they create a fall in pressure and the system is said to be phase inverting. Each component

in the stereo system either preserves the phase of the incoming signal, and is said to be phase correct or inverts the phase and is said to be phase inverting. It is unimportant whether an individual component is phase correct or phase inverting, as long as the system as a whole is phase correct. This will be the case if the number of phase inversions is

even (or zero).

 

 

Specifications

Gain:

Phono Stage :  49 dB

Line Stage :  16.5 dB

Output: Maximum 20 V

Phase:  Line stage inverts phase of all inputs.

Phono Overload:  in excess of 200 mV at 1 kHz

Response:  bandpass 2 Hz to more than 100 KHz

RIAA Equalization to ±  .25dB (20 Hz - 20 KHz)

Hum and Noise (2 0Hz - 20 kHz):

Phono : 78 dB below 10 mV input

Line Level - 98 dB below 2.5V output

Distortion (Line Stage): THD & IMD less than .25%

Ouput Impedance: less than 800 Ω 

Dimensions (W x H x D):  19" x3,315" x  14.375"

Weight: 16 lbs