Was There a Heathkit W-1M or WM?

PB2 · 18th April 2009, 02:40 AM

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.

tomtt · 18th April 2009, 03:22 AM

http://www.heathkit-museum.com/hvmhifi.shtml

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

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

10/?

PB2 · 19th April 2009, 03:09 AM

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.

DHT112A · 19th April 2009, 03:19 AM

Just a shot but maybe

http://www.retrovox.com.au/A515.pdf

PB2 · 19th April 2009, 04:05 AM

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.

PB2 · 19th April 2009, 05:18 AM

Here's a discussion:
http://www.antiqueradios.com/forums/...a62aa9e043db2c

And more AWV Radiotronics scans:
http://greygum.net/radiotronics/

PB2 · 20th April 2009, 07:24 PM

Heathkit WA-1 is listed here with a picture of the power supply alone:
http://www.nostalgickitscentral.com/...kit_audio.html

Tom Bavis · 20th April 2009, 08:35 PM

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.

PB2 · 21st April 2009, 04:28 AM

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.

The-Planet · 21st April 2009, 04:22 PM

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

18th April 2009, 02:40 AM	#1
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	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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18th April 2009, 03:22 AM	#2
tomtt diyAudio Member Join Date: Aug 2002 Location: kansas city mo, and on occasion, around the world ... Blog Entries: 15	http://www.heathkit-museum.com/hvmhifi.shtml http://en.wikipedia.org/wiki/Heathkit http://www.hifilit.com/hifilit/Acrosound/acrosound.htm 10/?

19th April 2009, 03:09 AM	#3
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	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.

19th April 2009, 03:19 AM	#4
DHT112A diyAudio Member Join Date: Jun 2005 Location: Tacoma , WA	Just a shot but maybe http://www.retrovox.com.au/A515.pdf

19th April 2009, 04:05 AM	#5
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	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.

19th April 2009, 05:18 AM	#6
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Here's a discussion: http://www.antiqueradios.com/forums/...a62aa9e043db2c And more AWV Radiotronics scans: http://greygum.net/radiotronics/

20th April 2009, 07:24 PM	#7
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	Heathkit WA-1 is listed here with a picture of the power supply alone: http://www.nostalgickitscentral.com/...kit_audio.html

20th April 2009, 08:35 PM	#8
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	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.

21st April 2009, 04:28 AM	#9
PB2 diyAudio Member Join Date: Sep 2004 Location: North East Blog Entries: 1	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.

21st April 2009, 04:22 PM	#10
The-Planet diyAudio Member Join Date: Mar 2003 Location: New Hampshire	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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