For Sale Pair of W5-M Heathkit 100% Restored and Upgraded

Just SOLD –

Here is a fully restored pair of Heathkit w5m mono-blocks, with Peerless 16309 output transformers with nickle cores

INCLUDED are a pair of Cages (not shown) these are very clean but they are un-restored with the original paint that show some signs of wear

These sound excellent. and have been lovingly restored from the ground up

I have used matched components during the rebuild and upgrade

Also Note: that the scale for the balance voltage is MV (mili-volts) and ideal is 0 volts, with the meter set to volts it reads “0”


  1. all parts of the chassis and have been sand blasted and painted with primer and automotive paint that was color matched with the same color as the originals(clear coated)
  2. the power transformers and choke have also been sand blasted primed and painted with black automotive paint (clear coated)
  3. Output transformer #1 has been painted with hamertone paint to match the original
  4. Output transformer #2 has the original paint and decal, it matches closely to the other but the origianl paint was in perfect condition
  5. these have SDI Labs Cap Board installed with the original can caps in place for looks (they have been clear coated with automotive paint)

NOTE: the chassis do not have lettering and the rubber feet are slightly miss-matched between the amps.

aside from the feet they are they are virtually identical


  1. NEW Power Switches
  2. all new parts – Metal film or metal oxide resistors that have been hand matched
  3. IEC power cord connector
  4. Gold Plated input jack
  5. lab grade Balance inputs
  6. gold plated banana plug speaker outputs (these have been tied to the 8ohm taps – the 4 and 16ohm taps are still available under the chassis)
  7. New Solen “fast caps” through out
  8. Silver wire or point to point in the signal path –
  9. Cloth covered wire in power supply
  10. New filter caps and SDI Labs cap board
  11. New tube sockets (9pin)
  12. NOS tube sockets (octal)


  1. :hi wattage ziener diode on the B+ to drop the voltage to 1957 levels (1957 line voltage was 110v modern voltage is about 115 to 117)
  2. Thirmisters to slow the turn-on current to allow for the power output tubes to warm up before the B+ is applied
  3. Higher wattage resistors in parts of the power supply to help with reliability
  4. Power Switch
  5. IEC Power Cord Connector
  6. Gold Plated RCA Input Jack
  7. Gold Plated Banana Plug Jacks


  1. New kt66 tubes (JJ) they are matched pairs and as a quad between amps
  2. NOS 5R4 Tubes – RCA  Brown Base – Matched electronically – slightly different physically
  3. 12au7 matched various brands currently I am using RCA’s, I will ship with 4 closely matched NOS 12au7 tubes (I will re-test them and make sure they are still matched and sound great

I have been listening to these amps for at least 5 or 6 weeks and they sound great! all then need is a new home.

I will ship them in 2 boxes and they will be very well packed. – keep in mind that these amps weigh about 30 pounds each


Restored Heathkit w5-m mono tube amps

Heathkit W5-M with SDS Labs cap board

W5-M Close to complete restoration



NOS RCA 5r4 in W5m Heathkit

NOS RCA 5r4 in W5m Heathkit

mili-volt scale balance voltage on w5m

mili-volt scale balance voltage on w5m

mili-volt reading on heathkit w5m matched pair

mili-volt reading on heathkit w5m matched pair

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