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djoffe 23rd April 2011 03:43 AM

Historic Tube Amplifiers
Here is a link to some articles and catalogs from the 50's that may be of interest. They are high res pdf files, so may take a bit of time to download.

These tube amps were designed by Hafler and Keroes before there was a Dynaco:

* A pre-Dynaco designed Ultra-Linear Tube Amp by David Hafler
* A Williamson Amplifer by Herb Keroes
* Dynaco introduces the center channel speaker connection
* A catalog of transformers and tube amp designs, ca. 1950

Here's the link:
Update My Dynaco

djoffe 23rd April 2011 08:55 PM

A few more historic amps
Here are a few more historic tube amps:

An older Audio Research and Mcintosh Design:

* Audio Research Dual 75, from 1971
* Mcintosh MC30, a 30 Watt Mono amp with the famous cathode coupling, from 1950

Update My Dynaco

djoffe 2nd May 2011 04:02 PM

Mullard Circuits, from 1960-ish
This link is to a great collection of circuits in a book put out by Mullard, first appearing in 1959:

Mullard Circuits for Audio Amplifiers

trobbins 2nd July 2011 01:59 PM

I'll bring this thread back to life, partly to say I just linked to your site djoffe (if that is ok?) as part of a compendium of references for the Williamson amplifier (Dalmura Pty Ltd website by Robbins family in Melbourne, Australia. genealogy, symons, willington, leggett, rockbeare, shirehampton, bet bet, amplifier, valve, tim robbins), and partly to ask if anyone has a copy of or could possibly scan it for me:

- The "Williamson Type" Amplifier Brought Up to Date - by M. V. Kiebert from August 1952 in Audio Eng,

- August 1949, RADIO-ELECTRONICS (a design for a complete high fidelity tuner-amplifier)

Ciao, Tim

djoffe 2nd July 2011 02:04 PM


My pleasure to have you include my link. It looks like there's a lot of good stuff also at your web site....


trobbins 2nd July 2011 02:36 PM

Thanks Dan - much appreciated.

trobbins 3rd July 2011 01:10 PM

Hi all,
I'm also unable to find a copy on the web of:

"Improving the Williamson Amplifier" by Hafler et al, Radio & Television News, February 1953.

If anyone has a copy or a link then that would be much appreciated.

Ciao, Tim

Bas Horneman 3rd July 2011 01:29 PM

Did find something with the title you mentioned. However the author is different.

trobbins 3rd July 2011 02:06 PM

Thanks Bas. Yes I have that paper. The earlier one has the same title, but it is by David Hafler. Regards, Tim

trobbins 7th July 2011 10:25 AM

I was able to get a copy of 'The "Williamson Type" Amplifier Brought Up to Date' - by M. V. Kiebert from August 1952 in Audio Engineering. Well worth a read to get a very practical insight in to noise and distortion improvements circa 1952.

Ciao, Tim

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