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Old 26th January 2013, 01:24 PM   #11
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Default Mullard Circuits!

Hi!

Quote:
This link is to a great collection of circuits in a book put out by Mullard, first appearing in 1959:
This link is lousy premium - surely this book must be out of copyright by now! Every link I can find has been made private or deleted!!!

tonicamps.com had a link but it was corrupted with only 33MB out of the 51MB available!

Has anyone got a working link to this 51MB file please? I'd buy a paper one from Abebooks but every copy seems to have migrated to lousy Australia and I can't afford all that postage!

Chris Williams
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Old 26th January 2013, 01:55 PM   #12
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I'll put it up in a minute. Will let you know when I'm done.
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Old 26th January 2013, 02:23 PM   #13
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Mullard circuits for Audio Amplifiers - Adventures in sound

http://basaudio.net/blog/wp-content/...Amplifiers.pdf
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Old 30th January 2013, 01:39 PM   #14
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Hi!

Thank you very much for this Bas! There doesn't seem to be an obvious "thanks" button so please accept my grateful thanks for making this file available - both myself and my friend Mike Smith will enjoy it!

Chris Williams
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Old 30th January 2013, 08:03 PM   #15
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You are welcome.
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Old 31st January 2013, 02:19 AM   #16
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Quote:
Originally Posted by trobbins View Post
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
Tim,
Did you ever get a copy of this - if not, P.M me and I'll drag a scanned copy of the Triode Mafia Bookshelf for you.
Cheers,
Ian
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Old 31st January 2013, 06:52 AM   #17
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Hi Ian. Hal Layer had a copy of the Kiebert 1952 article :-)

But the 1949 Radio-Electronics article still eludes me, and I haven't yet been able to get Peter Stinson's approval to upload his 22 page history compilation on the Williamson amp.

Ciao, Tim
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Old 1st February 2013, 03:12 AM   #18
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Has anyone else modified a Williamson per this article?
I had a pair of Heath W-2's or W-3's (whichever model that came with the Acrosound TO-300 OPT). They were a curb-find when I was 12 years old. I had them playing nicely 2-3 weeks after I found them.
One of my mentors/neighbors had a small lab in his garage and even had test equipment! One night we put them on his bench and surveyed their performance using his HP audio generator, square wave generator, AC VTVM, distortion analyzer, scope etc.
It was as much a mentoring session in the use and application of test & measurement equipment as it was a performance test for the Heath amps.

While my "cobbled together with 1950 RCA B&W TV parts" Heath amps sounded great to my then 13 year old ears, I decided I wanted to build my own stereo Williamson amp from scratch.
I built a stereo version based on the exact circuit in this article.
My mentor took it to a meeting of the HiFi club at Bell Labs. He said it was a big hit with everyone there and he'd had two members ask him to build one for them. That was before he told everyone that his 13 year old neighbor had built it..
The two members that wanted one built took my # and I did end up building amps for them. One of the guys was my neighbor's boss. He added me to his account at the local electronic parts distributor and let me sign for anything I needed. The other was a co-worker of my neighbor. He gave me a bunch of WE catalogs and cut-sheets to develop a list for him for the "company store". Everyone whom worked there had (if they so desired) a personal account at the parts counter, which they were encouraged to make use of. They could get anything WE made for any sort of project they wanted to build. The cost was something like 85% discounted and was deducted from their paycheck. His amp had WE output xformers, a WE power xformer and 3 WE chokes, as well as WE350A output tubes. He got an extra set of xformers for me as compensation for the work of building his amp.
The other guy gave me $50, which was the most money I'd ever had up until then. While we were listening to his new amp he handed me a folded bill, which I assumed was a $20 and with which I was very happy. When I discovered it was a $50 I was shocked!
I still have that set of WE xformers and chokes. They've been in and out of at least a dozen other amp builds over the last 38 years.
I also have the original chassis's from the Heath amps with the original power xformers and chokes on the PS chassis's. The Acrosound TO-300 output xformers are on the stereo Williamson which I also still have.
It still has the same set of KT66 output tubes. It still sounds great despite having all the original electrolytic caps in it

Given how hard it's been getting to find old gear it's hard to imagine ever again finding a pair of Heath W-2 (or W-3s) amps in someone's garbage, especially having a good set of UNBROKEN KT66's.


Quote:
Originally Posted by Bas Horneman View Post
Did find something with the title you mentioned. However the author is different.

http://www.mif.pg.gda.pl/homepages/j...il/willimp.pdf
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DrRick
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Old 2nd April 2014, 08:12 AM   #19
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I have put the full article by P.R. Stinson in the Williamson Amplifier compendium link below - a great historical read on much more than just the Williamson amplifier.

Dalmura Pty Ltd
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