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williamson amp [message #8253] Sat, 12 June 2004 18:29 Go to next message
Manualblock is currently offline  Manualblock
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Registered: May 2009
Illuminati (13th Degree)
Sorry to hog the threads but does anyone have experience with the Williamson Amp?

Re: williamson amp [message #8254 is a reply to message #8253] Sun, 13 June 2004 00:59 Go to previous messageGo to next message
metasonix is currently offline  metasonix
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I've built a couple, and fixed scores of them.
Whadya wanna know?


Re: williamson amp [message #8255 is a reply to message #8254] Sun, 13 June 2004 15:55 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
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Registered: May 2009
Illuminati (13th Degree)
Thanks for the help. In the driver stage do you like 6sn7 or 12au7's? How much feedback? What kind of bias? And last, phase-splitter; concertina? How do feel about 807 power tubes? I would like to try putting one together thats why I ask. Again thanks,J.R.

Re: williamson amp [message #8260 is a reply to message #8255] Tue, 15 June 2004 00:43 Go to previous messageGo to next message
metasonix is currently offline  metasonix
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Registered: May 2009
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OK, if you must:

6SN7s

about 10-15 dB

Fixed (negative grid) bias

I would stick to the classic circuit. Don't mess with it
unless you are familiar with designing differential
amplifier stages.

807s are great. The cheap Chinese ones aren't, but NOS
are still relatively easy to find. 6550s or KT88s
are even better--more gain, tougher screen grid.


Re: williamson amp [message #8261 is a reply to message #8260] Tue, 15 June 2004 06:25 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
Thanks much; not a big fan, eh?

Re: williamson amp [message #8265 is a reply to message #8261] Tue, 15 June 2004 20:44 Go to previous messageGo to next message
metasonix is currently offline  metasonix
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>not a big fan, eh?

How do you mean? It's a classic topology. But depends heavily on a good output transformer. Don't skimp on that.

In fact, if you want a really good version, I recommend the John Eckland designed KT88 amp project in VTV issue 19.
It uses Plitron transformers. I can attest to its excellence, having heard it (with a variety of classic speakers).


Re: williamson amp [message #8267 is a reply to message #8265] Wed, 16 June 2004 07:05 Go to previous messageGo to next message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
I just assume any decent amp depends on the opt and of course would get the best within reason. Plitron is fine by me, is that amp on the plitron site? I know that Memmo VanDevere does one similar to that amp. May I ask how the amp does with very efficient, well damped bass-reflex woofers?

Re: williamson amp [message #8276 is a reply to message #8267] Wed, 16 June 2004 23:07 Go to previous messageGo to next message
metasonix is currently offline  metasonix
Messages: 103
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It works extremely well with any kind of speaker. Bass enjoys considerable damping, without sounding like a soiled-state amp.

No that amp isn't on the Plitron site. Sorry, you have to get that issue of VTV. The owner of VTV expects to get paid, so support him and be nice.

Re: williamson amp [message #8278 is a reply to message #8276] Thu, 17 June 2004 06:26 Go to previous message
Manualblock is currently offline  Manualblock
Messages: 4973
Registered: May 2009
Illuminati (13th Degree)
No problem there I have every issue, and I buy retail! Matter of fact I can probably qoute you from issues you forgot about. Thanks for your help, J.R.

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