Was There a Heathkit W-1M or WM? - diyAudio
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Old 18th April 2009, 03:40 AM   #1
PB2 is offline PB2  United States
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Question Was There a Heathkit W-1M or WM?

I know the Heathkit Williamson W-3M very well. It was the first amplifier that I worked on as a young kid. It was old at the time - caps were probably getting old. This Heathkit version used 5881's, UL, and an Acrosound output transformer.

I found the W-2 Schematic on the net which also uses 5881s, is UL, but has a Peerless output transformer.

I'm working on what I think is a Heathkit, but with 807s, triode connected, and a Peerless OT without UL taps. Here's a picture:
http://baselaudiolabs.googlepages.com/Williamson3.JPG

Was there a version like this from Heathkit, an earlier Williamson? Confirmation or any more info would be appreciated.

Pete B.
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Old 18th April 2009, 04:22 AM   #2
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http://www.heathkit-museum.com/hvmhifi.shtml

http://en.wikipedia.org/wiki/Heathkit


http://www.hifilit.com/hifilit/Acrosound/acrosound.htm


10/?
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Old 19th April 2009, 04:09 AM   #3
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Thanks, the Acrosound data is new to me, but saw the rest. I've not seen anything on a Heathkit with 807s.
I should probably write to one of the Heathkit historical sites.

Pete B.
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Old 19th April 2009, 04:19 AM   #4
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Just a shot but maybe

http://www.retrovox.com.au/A515.pdf
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Old 19th April 2009, 05:05 AM   #5
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Yes, I have that also. That seems to be the paper where 6L6 type tubes such as the 807 were tested in place of the original KT-66. The 6l6 types were not rated for the higher plate and screen voltage used in the Williamson. All the Heathkit Williamsons that I've mentioned use a 420-440V plate supply.

That paper does seem to be the basis for the one that I have triode connected rather than Ultra-Linear, and using 807s. I think this is a very early Heathkit implementation. That design seems to be one chassis, and uses more choke filtering. Other than that it is very close to this unit.

Thanks,
Pete B.
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Old 19th April 2009, 06:18 AM   #6
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Here's a discussion:
http://www.antiqueradios.com/forums/...a62aa9e043db2c

And more AWV Radiotronics scans:
http://greygum.net/radiotronics/
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Old 20th April 2009, 08:24 PM   #7
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Heathkit WA-1 is listed here with a picture of the power supply alone:
http://www.nostalgickitscentral.com/...kit_audio.html
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Old 20th April 2009, 09:35 PM   #8
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Gary Kaufman said that there were two versions of the W1 - triode (earliest) and ultralinear - and said he had both schematics. You might give him an email: gkaufman(at)the-planet(dot)org.
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Old 21st April 2009, 05:28 AM   #9
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Thanks, yes I saw that in his post on the linked forum above. I will email him and see if I can get more information about this particular unit.
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Old 21st April 2009, 05:22 PM   #10
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Yup, that's the output section of the W1.

Hopefully you have the power supply section as well. Same shape chassis with a potted power transformer, choke and 5V4G.

Send me a private email and I can set you up with manual/schematic etc.

- Gary
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