Heathkit
WA-P2 pres
W-5M amps
WA-P2 Master-Control Preamplifier
* 3 high-level inputs ea with level-trim control.
* Equalization for LP, RIAA, AES, 78.
* Separate bass and treble controls.
* Low-impedance cathode-follower output.
In planning the purchase of a really fine hi-fi system or improving a present one, the WA-P2 should receive your serious consideration. It has many fine features that will eventually be desired. Designed to operate with the Heathkit models W-3AM, W-4AM, W-5M and W-6M amplifiers, this control-center provides almost infinite combinations of equalization and compensation.
It features five switch-selected inputs, three high-level inputs for 0.1 Volts or higher at 0.5M Ohms input impedance and two low-level inputs, for 0.1 Volts or lower for magnetic phono pickup or microphone. Each input has its own level control to eliminate blasting or fading while switching through the various inputs, and will accommodate a record changer or player, tape recorder, AM-FM tuner, TV receiver, or microphone, etc.
Provision is also made for a tape recorder output that is not affected by the volume or tone controls so that the program material being recorded can be monitored without affecting the recording. A special hum control is provided for absolute minimum hum level. The low impedance cathode-follower output circuit allows complete installation flexibility, making the WA-P2 ideally suited for "remote" installations as output lead length is not critical.
The frequency response is within +/- 1.5 db from 15Hz to 35kHz.
Equalization is provided for records through separate turnover and rolloff switches for LP, RIAA, AES and early 78's. The turnover switch produces the rising low-frequency characteristics required for proper equalization since record manufacturers deliberately limit the low frequency intensity to avoid cutting into adjacent grooves. The rolloff control deemphasizes the high frequencies, removing much of the noise and scratch through four positions of 8, 12, 16 and 1 flat position.
Separate tone controls provide 18 db boost and 12 db cut at 50Hz on bass and 15 db boost and 20 db cut at 15kHz on treble. Power requirements for the WA-P2 are 6.3 Volts AC at 1 Amp, and 300 volts DC at 10 mA from the basic amplifier with which it is used.
Additional features include tube shielding, plastic sealed capacitors, smooth acting controls, good filtering, excellent decoupling, low hum and noise level, and an all-steel cabinet.
The WA-P2 has been carefully pre-engineered for you to insure specified high performance level. All components were especially selected for their high quality, and all values are clearly stamped to avoid mistakes. The construction manual contains complete step-by-step directions, with large pictorial diagrams that can be hung over the work area for easy reference. Successful construction is assured even for the beginner.
Three high-level & two low-level inputs with individual level controls for each.
High-level inputs:
1, 2 & TUNER, for 0.1 Volts or higher,
500k Ohm input impedance.
Low-level inputs:
PHONO & MIC, for 0.1 Volts or lower:
Magnetic phono 22k Ohms.
Microphone 2.2M Ohms.
Frequency Response:
1.0 db from 25Hz to 30kHz.
1.5 db from 15Hz to 35kHz.
Hum and Noise:
0.5 Volt at Tuner input, 72 db bellow 2.0 Volts RMS.
6 mV at PHONO input, 62 db below 2.5 Volts RMS.
15 mV at MIC input, 70 db bellow 2.5 Volts RMS.
Tone Control:
Separate bass & treble tone controls.
18 db boost and 12 db cut at 50Hz.
15 db boost and 20 db cut at 15kHz.
Power Supply:
Requires power from external source:
6.4 Vac at 1.0 amp & 300 Vdc at 10 mA.
Dimensions:
12.6" Long, 3.6" High, 5.9" Deep.
Weight:
Net weight: 3.5 lbs.
Ship weight: 7 lbs.
CLICK for more WA-P2 
W-5M Monoblock Amplifier
Special Peerles 16309 nickel-core output transformer
(* later production used less-costly 16458 xfmr).
Full 25 watt output with KT66 tubes.
Simplified balance-circuit requires only voltmeter for adjustment.
Wide bandwidth and Low phase-shift.
Low Intermodulation and Harmonic distortion.
The W-5M Amplifier is considered top value in its power class by leading independent research organizations. It incorporates all the latest advance-design features for the super-critical listener. You can enjoy virtually distortionless reproduction from one of the most outstanding high fidelity amplifiers available, at any price!
This amplifier [originally] employs a specially-designed Peerless nickel-core output transformer and KT66 output tubes. Involving entirely new techniques in transformer design, this Peerless unit prevents loss in frequency response, especially at moderate volume levels, in addition to allowing increased power output. The circuit is rated at 25 watts, and will follow instantaneous power peaks of a full orchestra up to 42 Watts.
Featured also, is the "tweeter saver" which suppresses high frequency oscillation, and a new type balancing circuit. This is easier to adjust, requiring only a voltmeter, and it results in a closer "dynamic" balance between output tubes. Overall results are improved phase shift characteristics, reduced IM and harmonic distortion, and improved frequency response. With complete stability under all dynamic operating conditions.
The frequency response is +/-1 db from 5Hz to 160kHz at 1 Watt, and within 2 db from 20Hz to 20kHz at full 25 Watts output. Harmonic distortion is 1% at 25 Watts and intermodulation distortion is 1% at 20 Watts (60 & 3kHz, 4:1). Hum and noise are 99 db below 25 Watts for truly quiet performance. The specifications above were taken with the most modern and accurate test equipment available in 1958. They are actual measurements taken on a typical amplifier, under carefully controlled conditions, not representing the most favorable operating conditions nor advertising information.
All connectors and terminals are located on one side of the chassis apron for convenience. The circuit is fused, and two AC outlets are provided for accessory equipment. One outlet is switch-operated and can be used to automatically turn off record player motor when amplifier is turned off. Provision is made for matching 4, 8 or 16 Ohm speakers at a terminal strip on the chassis. The chassis is finished in satin-gold enamel, and all terminals and tube sockets are marked as to type and function. An attractive cover fits over all above-chassis components. This not only "child-proofs" the unit, but it results in a most attractive finished appearance. The bottom plate also has large rubber feet to prevent marring of furniture. It is suitable for use in or out of a cabinet. Rich black and gold color harmonizes with the Heathkit model WA-P2 Preamplifier, the Heathkit model FM-3A Tuner, and blends with any room decoration.
Conservatively rated, high quality components are used throughout to insure years of trouble-free performance. Its specifications, completely outlined above, clearly indicate the superiority of this amplifier for the individual who wants something special in top-quality audio. The construction manual is written so that no technical background or training is required for assembly. Complete step-by-step instructions are provided for every stage of construction, and large pictorial diagrams illustrate exactly where each wire and component is to be placed.
Power Output:
25 Watts.
Frequency Response:
+/- 1 db from 5Hz to 160kHz at 1 Watt.
Total Harmonic Distortion (THD):
1% at 25 Watts output.
Intermodulation Distortion (IM):
1% at 20W (60 & 3kHz, 4:1).
Hum and Noise:
99 db below 25W.
Damping Factor:
40:1.
Input Sensitivity:
1V for 25W output.
Tube Compliment:
2-12AU7, 2-KT66/6L6/5881, 1-5R4GY.
Output Transformer:
Early: Peerless 16309 with nickel-core.
Late : Peerless 16458 with larger case.
Power Requirements:
105~125 Volts, 50/60 Hz, 140 Watts.
Dimensions:
13.1" Wide, 8.5" Deep, 8.25" High.
Shipping Weight:
31 lbs.
CLICK for more W-5M AllegroSound
− Established 1973 −
"love what you listen with"
Los Angeles, California USA
Rick@AllegroSound.com
FOR SALE - TRADE 
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