OFF - FOR SALE: Heathkit W-5M Monoblock Pair
Item #649394750Info: Heathkit W-5M Monoblock Pair
||Cash, Money Order, Interac/EMT
||6 - Fair (?)
Dec 13, 17 12:00am (PST)
Edited: Apr 05, 18 5:55pm
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Offered for sale are a restored and good sounding pair of Heathkit model W-5M, 25 Watt mono amplifiers plus cages.
Owning and rebuilding these has given me great pleassure but it is time to find them a new home and clear some space for the next project.
The restoration of the amps was done following the original circuit design. Some additional upgrades as follows were made to improve looks, functionality and protection:
1) The two multisection capacitors (silver cans on top of the chassis) were removed and replaced with individual capacitors below the chassis to improve looks and provide better cooling flow around the power tubes.
2) A double pole on/off slider switch was installed in place of the top rear chassis receptacle (the original design had no power switch).
3) An electronic time delay reduced voltage start up module was installed to simulate the thermal mechanical "surgistor" supplied in some of the later W-5M models.
The components used in the restoration are high quality and were all individually measured and matched where needed. Power output, gain and frequency & square wave performance of the amps were checked on completion of the work. Since the restoration, the amps have had roughly 25-50 hours of playing time.
Both amplifiers have the same (factory supplied) Altec Lansing Peerless model 16309 output transformers.
All tubes are included with the amplifier. These consist of two 12AU7's (driver and phase converter), one 5R4GY rectifier and two 6L6WGC output tubes. The rectifier and 12AU7's are old stock American made and the output tubes are a new matched set of Russian 6L6WGC. (Operation of the bias currents and balance of the output tubes are noted to be rock solid.)
Due to the approximate 60 years age of the power and output transformers, sale of the amps is on an "as is" basis with no warranty or guarantee.
Audition of the amps is available to serious buyers. Local sale is preferred. Shipping is extra to the asking price and would require two separate boxes at approximately 30 lb each.
Included are: The factory cages (though hardly noticeable, one has a wrinkle finish, the other does not); A coil bound reprint of the 33 page manual with schematic diagram updated to cover the changes, vacuum tubes as described above with shielding sleeves for the small tubes.
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