AWV Radiotronics
AWV Radiotronics was a publication by the Australian Amalgamated Wireless Valve Company (AWV). It published articles relating to all aspects of electronic design, and to a lesser extent, production, from the 30's until at least the late 60's. It is worth noting that AWV were the employer of F. Langford-Smith, of Radiotron Designer's Handbook fame, and many of the articles from Radiotronics had input from him.
I've put the articles here for both historical interest and because they may be of use to people working with valves (tubes) today. Some are obviously more the former than the latter.
Hopefully some time next year I will have the time to scan entire issues and put them up here, don't hold your breath though. To this end I'm still looking for more issues, if you have some you could send my way please get in touch. I promise they will be here for everyone to use eventually.
May - July 1955 - Ultra-Linear Amplifiers
A series of articles discussing UL connected amps, including an in-depth discussion of the point at which a UL tap should be taken. By F. Langford Smith and A. R. Chesterman. Well worth a read if you are building UL connected amps. Apologies for the scan quality on this one. Link
Several push-pull 2A3 based amplifiers from the 1930's
A515 - The Langford-Smith version of the Williamson
The main article from this is around the net a bit already. I've added the intermodulation distortion measurements and the revised 807 data that came out of testing for this amp.
After this article was published there were several Australian transformer companies such as Red Line, A&R (later to become Arlec) and Ferguson producing transformer kits for this amp. The output transformers were made to the spec in the article and should perform quite well compared to the Partridge transformers used in the original Williamson. They are well worth bearing in mind when at clearance sales and so on, I have got lucky before. Original Article Intermodulation distortion measurements Revised 807 rating
Grounded-Plate Type 6AU6 Triode Connection for Pre-Amplifier use
KT61 Application Report
The Plotting of Valve Characteristics
Triodes Versus Beam Power Amplifiers
The controversy resolved! Over 50 years ago! Link
Limiting Class A Operation
An article by F. Langford-Smith on operating output stages at an intermediate point between Class A and AB1 Link
Examinations of Conditions which Give Rise to Hum Due to Heater-Grid Capacitance
Three 807 based AF amplifiers
Published on Friday, March 26 2010 by Pete