Hafler DH-330 tuner

The DH-330 tuner is the perfect complement to Hafler preamplifiers in technology, sound quality and facilities, as well as appearance FM tuning was never easier surer, or more listenable. On a live broadcast the realism is breath-taking. Your favourite station is there - perfectly - when you just switch it on.

If reception is difficult, this tuner stands out. More stations, both weak and strong, simply sound better. The DH-330 is the tuner for the exceptional - in program content in broadcast quality and in listener perception

The Hafler experience is sheer pleasure. You get the lowest distortion and noise fast accurate tuning with ideal interstation muting, and a dynamic suppressor for multipath interference. A 75 Ω  coaxial connection facilitates a shielded antenna connection, as well as 300 Ω  lead in. A volume control and a front panel output make taping and headphone use simple and convenient.

Selectable muting enables you to "DX" every signal, or just scan those with acceptable signal strength for quality reception. The five-station memory provides instant access to your favorites while Auto-Search (a five-second pause mode) and bidirectional seeking make it easy to find all the others.

A Hafler designed microprocessor highlights the sophisticated technology which makes tuning simple and positive. Quartz-controlled digitally synthesized tuning - not hust a digital readout - provides precision lowest distortion reception. The non-volatile memory need no batteries. Even if the tuner is unplugged the last station you listened to will reappear precisely tuned and all five preset stations are retained.

Multipath interference can distort even a powerful signal. This is a pervasive problem in cities, and often in the thills. The DH-330 has an exclusive multipath and noise sensing Auto-Filter circuit which greatly improves listening response and high frequency separation On a clear signal it is deactivated.

Once on station, the tuner's selectivity - or ability to reject extraneous interference - is paramount Five tuned circuits in the "front end", including a triple-tuned RF stage , make the DH-330 exceptional. The superior isolation of three dual-gate MOSFETs provides exceptional rejection of spurious artefacts and reduces any possibility of generating Intermodulation Distortion in the presence of high level signals. The incoming signal does not affect the oscillator and the added selectivity keeps the mixer stage from being overloaded by off-channel signals Four ceramic filters in the IF stages have a flat group-delay-characteristic improving selectivity and phase linearity and lowering distortion.

 

Specifications

Useable Sensitivity:  113 dBf (2 µV)

50 dB Quieting Sensitivity: 

Mono :  15,2 dBf (3,2 µV)

Stereo :  36,5 dBf (37 µV)

Total Harmonic Distortion (1 kHz, 100% modulation)

Mono :  0,1%

Stereo :  0,18%

Capture Ratio:  15 dB

Alternate Channel Selectivity:  60 dB

Stereo Separation:  45 dB (at 1 kHz); 35 dB (at 10 kHz)

Signal-to-Noise Ratio

Mono :  72 dB

Stereo :  68 dB

Power Requirements:  95 - 130 V, 190 - 260 V, 50/60 Hz

Power Consumption:  15 watts

AC Outlet:  1 switched

Dimensions (W x H x D):  17" x 3" x 8,5" = 1" for knobs

19" rack mounting accessories included

Weight:  9 lbs net

 

Hafler DH-120 power amplifier

The DH-120 may shatter the illusions of some audiophiles in their search for perfection with ever larger, heavier and more costly amplifiers. It demonstrates once again that quality, not quantity, is the deciding sonic factor. Engineered for adequate power, proper headroom and excellent overload characteristics, together with conservative ratings, the DH-120 surpasses in sound quality many amplifiers of substantially higher advertised output.

To the technically knowledgeable observer, the DH-120 is quite elegant. Its novel drive circuit is extraordinarily linear. Its very low distortion is achieved with relatively little negative feedback. The oversized heat sinks and power supply, the careful selection of critical components for their sonic attributes, and the evident product quality demonstrates our commitment to excellence.

The most important design element is the utilization of power MOSFET output devices MOSFET advantages include self-stabilization  robustness linearity, high speed, vaccum tibe-like characteristics and they require no thermal compensation. Because MOSFETs can handle heavy currents current limiting circuits are not required.

The audio enthusiast will appreciate the extra features which make the DH-120 more versatile than conventional amplifiers. Independent level controls on each channel are valuable for such applications as bi-amplification. For those needing higher power in a small package a back panel switch converts to a bridged mono mode which uses both channels to deliver in excess of 125 watts. If separate speakers are to be used in another area, a second set of speaker terminals is provided. Alternatively, these terminals can be switched to power rear speakers to add ambience recovery to the main system.

Hafler ingenuity has developed a uniquely simple and effective means of recovering heretofore inaccessible sonic details which have been hidden in many recordings and broadcasts. These elusive signals consist of reflected and reverberant sounds which contribute the sense of space and depth in the recording location. When these sounds are reintroduced through loudspeakers placed behind the listener using the Hafler Ambience Recovery System you will find a new sense of immediacy and involvement emerging from many of your familiar recordings.

 

Specifications

Power rating:  less than 0,009% Total Harmonic Distortion at any power level up to 62 watts continuous average power per channel into 8 Ω  at any frequency between 20 Hz and 20 kHz with both channels driven.

Intermodulation DIstortion (SMPTE): less than 0,005% from 1 watt in 62 watts each channel into 8 Ω

Total Harmonic Distortion : 0,002% (8 Ω , 1 kHz)

Frequency Response (at 8 Ω )

At 1 watt :  4 Hz - 200 kHz -3db

At 62 watts :  10 Hz -40 kHz +0 -1/2 dB

Typical Channel Separation: 

20 Hz :  better than 75 dB

1 kHz :  better than 85 dB

20 kHz :  better than 65 dB

Signal-to-Noise Ratio (Unweighted):  exceeded 103 dB referred to 62 watts into 8 Ω

Input Impedance:  22,000 Ω

Input Sensitivity:  11 volts rms for 62 watts into 8 Ω

Damping Factor:  100 to 1 kHz into 8 Ω ; 50 to 10 kHz into 8 Ω

Rise Time:  10 kHz, 45 volts peak to peak square wave, 10% to 90%, 2 µs

Slew Rate:  10 kHz, 45 volts peak to peak square wave, 30 V µs

Semiconductors:  22 Transistors; 4 Power MOSFETs; 23 Diodes; 8 Zener Diodes; 1 Diode Bridge

Power Consumption:  62 watts both channels into 8 Ω , 300 VA

Dimensions (W x H x D):  15-3/8" x 3-1/2" x 9"

Weight:  18 lbs Net

 

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

 

Hafler DH-220 power amplifier

A State of The Art. Power Amplifier

The DH-220 follows in the path of the widely acclaimed DH-200 amplifier which has had highly laudatory reviews and widespread consumer acceptance. Like the DH-200 amplifier, this 115 watt per channel amplifier is available either in easy-to-assemble kit form or factory assembled. Either way it is a highly reliable piece of equipment which can satisfy the most hyper-critical listener, including the audiophile with the most difficult loudspeaker load. And, in kit form the DH-220 provides a significant cost saving for a pleasant few hours of assembly time, using factory pre-assembled and tested audio modules.

The DH-220 utilizes all polypropylene capacitors in the circuit path. All electrolytic are bypassed by polypropylene capacitors. This results in a clarity of sound unusual in an amplifier of this size.

Two completely assembled and fully tested amplifier modules comprise all of the kit's active circuitry, leaving just a handful of parts for the builder to complete the mechanical assembly and power supply wiring. This makes your job simpler and faster, and assures that your finished kit will easily meet all of its specs, and provide the ultimate in listening pleasure.

 

The DH-220 employs a unique circuit configuration using all discrete transistors, operating the very latest output devices, power MOSFETs, in a conservative array. The result is that the benefits of Class A output stages are obtained - such as high speed, minimal crossover distortion, and decreasing distortion at lower signal levels - without the disaddvantages of high cost, high heat, low efficiency and thermal instability that are a part of conventional Class A operation. Like other Hafler products, this new power amplifier has a completely symmetrical, mirror-image complementary push-pull circuit from input to output.

 

Exceptionally low distortion is apparent on reading the specifications, but such figures cannot detail the unit's true capabilities. The significance of achieving orders of magnitude reduction in total harmonic distortion and intermodulation distortion lies in the correlative elimination of other distortion products. Presently recognized test standards are seemingly unable to quantify to many listeners. The DH-220's characteristics of vanishing distortion at lower signal levels, and minimal indication of any forms of transient distortion, such as slew induced distortion, as observed at all power levels of square waves, tone bursts and pulse tests, will, we are confident, maintain its superiority as new standards and tests become applicable.

 

Specifications

Power Rating:  less than 0,02% T.H.D. at any power level up to 115 watts continuous average power per channel into 8 Ω  at any frequency between 20 Hz and 20 kHz with both channels driven.

Intermodulation DIstortion (SMPTE): less than 0,005% from 1 watt to 115 watt into 8 Ω

Typical Total Harmonic Distortion at 115 wats into 8 Ω :

1 kHz :  0,0015%

10 kHz :  0,005%

20 kh :  0,012%

Frequency Response (into 8 Ω ):

2 Hz to 160 kHz at 1 watt (-3 dB)

6 Hz to 60 kHz at 115 watts (-0,5 dB)

Typical Channel Separation:

20 Hz :  75 dB

1 kHz :  85 dB

20 kHz :  65 dB

Signal-to-Noise Ratio (Unweighted): better than 100 dB at 115 watts into 8 Ω

Input Impedance:  47,000 Ω

Input Sensitivity:  1,55 volts rms for 115 watts into 8 Ω

Damping Factor:

300 to 1 kHz into 8 Ω

60 to 10 kHz into 8 Ω

Rise Time:  10 kHz, 60 volts peak to peak square wave, 10% to 90% :  2,5 µs

Slew rate:  10 kHz, 60 volts peak to peak square wave :  30 V/µs

Semiconductors:  26 Transistors; 8 Power MOSFETs; 29 Diodes; 4 Zener Diodes; 1 Diode Bridge

Power Consumption:  Quiescent 125 VA, 115 watts into 8 Ω  ; 580 VA

Dimensions (W x H x D): 16" x 5-1/8" x 10-1/2"

Weight: 26 lbs net

Hafler DH-200 power amplifier

Both ears and instruments attest to the excellent quality of the DH-200 power amplifier. It has both superior test specifications and the listening quality to satisfy the most critical listeners, including those for whom price is not a limitation.

The DH-200 follows in the path of the widely acclaimed DH-101 preamplifier which has had highly laudatory reviews and wide spread consumer acceptance. Like the preamplifier this 100 watt per channel amplifier is available either in easy-to-assemble kit form or factory assembled. Either way it is a highly reliable piece of equipment which can satisfy the most hyper-critical listener, including the audiophile with the most difficult loudspeaker load. And, in kit form the DH-200 provides a significant cost saving for a pleasant few hours of assembly time, using factory pre-assembled and tested audio modules.

Two completely assembled and fully tested amplifier modules comprise all of the kit's active circuitry, leaving just a handful of parts for the builder to complete the mechanical assembly and power supply wiring. This makes your job simpler and faster, and assures that your finished kit will easily meet all of its specs, and provide the ultimate in listening pleasure.

The DH-200 employs a unique circuit configuration using all discrete transistors, operating the very latest output devices, power MOSFET's in a conservative array. The result is that the benefits of Class A output stages are obtained - such as high speed, minimal crossover distortion, and decreasing distortion at lower signal levels - without the disadvantages of high cost, high heat, low efficiency and thermal instability that are a part of conventional Class A operation. Like the Hafler preamplifier, this power amplifier has a completely symmetrical, mirror-image complementary push-pull circuit from input to output.

Exceptionally low distortion is apparent on reading the specifications, but such figures cannot detail the unit's true capabilities. The significance of achieving orders of magnitude reduction in Total Harmonic Distortion and Intermodulation DIstortion lies in the correlative elimination of other distortion products. The footnote at the end discusses this in detail.

 

The DH-200's characteristics of vanishing distortion at lower signal levels, and minimal indication of any forms of transient distortion, such as slew induced distortion, as observed at all power levels of square waves, tone bursts and pulse tests, will , we are confident, maintain its superiority as new standards and tests become applicable.

T.H.D. and Intermodulation Distortion (both SMPTE and CCIR measurements) are below the threshold of the finest test equipment - from one-tenth of a watt to beyond 70 watts. Measured with the Sound Technology Model 1701A analyzer, typical mid-band distortion at full power into 8 ohms averages 0,0015%

Another limiting factor in correlating sound quality to measured performance is that conventional amplifiers may measure well on the standard resistive test loads, but exhibit distortion when confronted by the complex reactive loads of the loudspeaker and its crossover network. The Hafler DH-200 has the power reserves to handle mismatched loads (it can deliver 150 watts into 4 ohms, and 100 watts into 2 ohms), but more important, it can handle the back - EMF from the loudspeaker cone without generating interfacing distortion components.

With no need for special protective circuits which may compromise sonic performance, the self-protective design of the DH-200 output stage prevents the thermal runaway which is a threat to other designs.

For applications requiring extraordinary power, the DH-200 may also be bridged to convert it to 300 watt (at 8 ohms) monophonic amplifier, with similar distortion specifications. As a modestly priced, versatile "no frills" design, operating premium quality components conservatively for extended life, this new Hafler amplifier is the audio perfectionist's answer to state of the art. Performance at affordable prices.

 

Specifications

Power Rating:  less than 0,02% T.H.D. at any power level up to 100 watts continuous average power per channel into 8 Ω  at any frequency between 20 Hz and 20 kHz with both channels driven.

Intermodulation DIstortion (SMPTE): less than 0,005% from 1 watt to 100 watt into 8 Ω

Typical Total Harmonic Distortion at 100 wats into 8 Ω :

1 kHz :  0,0015%

10 kHz :  0,005%

20 kh :  0,012%

Frequency Response (into 8 Ω ):

-3db, 1 Hz to 100 kHz at 1 watt

±0,5 dB, 10 Hz to 40 kHz at 100 watts

Typical Channel Separation:

20 Hz :  66 dB

1 kHz :  66 dB

20 kHz :  60 dB

Signal-to-Noise Ratio (Unweighted): better than 100 dB at 100 watts into 8 Ω

Input Impedance:  22,000 Ω

Input Sensitivity:  1,5 volts rms for 100 watts into 8 Ω

Damping Factor:

150 to 1 kHz into 8 Ω

50 to 10 kHz into 8 Ω

Rise Time:  10 kHz, 60 volts peak to peak square wave, 10% to 90% :  2,5 µs

Slew rate:  10 kHz, 60 volts peak to peak square wave :  25 V/µs

Semiconductors:  26 Transistors; 8 Power MOSFETs; 24 Diodes; 4 Zener Diodes; 1 Diode Bridge

Power Consumption:  Quiescent 100 VA, 100 watts into 8 Ω  ; 370 VA

Dimensions (W x H x D): 16" x 5-1/8" x 10-1/2"

Weight: 26 lbs net

 

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

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 )