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Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 1:29 pm
by Dougloid
C'mon Jan....I know you're in there somewhere.

RE: Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 6:14 pm
by David L
Never had the need. The Williamsons I know are quite loud enough, thank you.

RE: Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 7:18 pm
by Dougloid


Quoting David L (Reply 1):
Never had the need. The Williamsons I know are quite loud enough, thank you.

Smarty pants. Yer killin' me.


 laughing   laughing   laughing 

RE: Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 7:58 pm
by David L
OK, in other words... I'd never heard of such a thing. I'd be interested so see what the thread brings up.

Sorry about that!

RE: Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 9:02 pm
by Dougloid
I woulda thought a Union Jack guy like yourself would have been an authority.

http://www.clarisonus.com/Archives/A...20The%20Williamson%20Amplifier.pdf

RE: Anyone Build A Williamson Amplifier?

Posted: Wed Oct 01, 2008 9:45 pm
by David L


Quoting Dougloid (Reply 4):
I woulda thought a Union Jack guy like yourself would have been an authority.

Well, yes, I am... just as all you Stars and Stripes guys are rocket scientists. I'm just going to have to sit back and watch.  biggrin 

RE: Anyone Build A Williamson Amplifier?

Posted: Thu Oct 02, 2008 3:29 am
by KevinL1011
Couldn't afford the Williamson. Built a Heathkit.
I love the smell of factory fresh electronic components.  drool 
I loved opening a brand new sealed kit for the first time and burying my face deep in the box to inhale that sweet smell. Carcinogenic for sure.



Mmmmmm.......laminates.

RE: Anyone Build A Williamson Amplifier?

Posted: Fri Oct 03, 2008 4:45 pm
by AverageUser
Why bother when better alternatives to dissipate some heat exist?
http://circlotron.tripod.com/

RE: Anyone Build A Williamson Amplifier?

Posted: Sat Oct 04, 2008 2:13 am
by Dougloid


Quoting KevinL1011 (Reply 6):
Couldn't afford the Williamson. Built a Heathkit.



Quoting AverageUser (Reply 7):
Why bother when better alternatives to dissipate some heat exist?
http://circlotron.tripod.com/

That was a strange excursion. It's the answer to a question that nobody asked, apparently.

My interest in the Williamson is a deciphering project that I and others are working on, to reverse engineer the Standel 25L15, which has some Williamson features.

RE: Anyone Build A Williamson Amplifier?

Posted: Sat Oct 04, 2008 7:00 pm
by AverageUser


Quoting Dougloid (Reply 8):
That was a strange excursion. It's the answer to a question that nobody asked, apparently

Going for the best available topology for your tubed amp is strange, how come? The Russian version of the amp even has the original tubes available for penny a piece, the output stage transformer would be a fraction of the complexity and price (carries no DC component through if). I'm also told by someone who has built one that the amp is very reluctant to oscillate, something most amateur builders will appreciate. Also the neg feedback is over far less stages in the Köykkä design - TIM distortion became know only after old man Williamson. (see: http://en.wikipedia.org/wiki/Audio_amplifier )

You'll be able to keep your Williamson chassis and most of the drillholes.  Smile

RE: Anyone Build A Williamson Amplifier?

Posted: Sat Oct 04, 2008 10:58 pm
by Dougloid


Quoting AverageUser (Reply 9):
TIM distortion became know only after old man Williamson. (see: http://en.wikipedia.org/wiki/Audio_amplifier )

You'll be able to keep your Williamson chassis and most of the drillholes.  

My interest is not in the most efficient audio reproduction, but in building good sounding guitar amps. That doesn't mean low distortion.

The project this winter may be a reverse engineered 25L15, which does have some Williamson features. What I'm trying to figure out is whether it really made any difference.


Big version: Width: 640 Height: 480 File size: 81kb
mo gits

RE: Anyone Build A Williamson Amplifier?

Posted: Sun Oct 05, 2008 11:45 am
by AverageUser
The guitar and the tube amp combined is a subjective twilight zone. My anatomy and brains are incompatible with musicianship, but I wonder if the guitarists' tradition of wanting some distortion could be filled more predictably and easily in the early stages of the amp. After all, the final stage tubes in a traditional push-pull amp are never quite similar and will age differently so the amount of distortion each one will cancel out for the other will creep all the time.

I located a tube amp design by one Jukka Tolonen, who's a well know Finnish guitarist of the older generation. He apparently seems to prefer less distortion, so he has gone for an ultralinear final stage (he has had the transformer built for him) in push-pull class A mode in his design. He also said the original Williamson output transformer was too difficult for him to obtain.

http://koti.mbnet.fi/siliconf/JukkaTolonen/hifi/samuli/samuli1.html (roll the number for all parts of the story)
For the artist himself see http://www.jukkatolonen.com/
But as I said, these things are highly subjective.

RE: Anyone Build A Williamson Amplifier?

Posted: Sun Oct 05, 2008 4:47 pm
by dan2002