Radiotron A504 amplifier schematic

Tubes4e4 · 25th December 2011, 07:26 PM

Gentlemen,

I am seaching for the Radiotron A504 amplifier schematic. I suspect that it was a rather early 6V6 push pull amplifier, likely published in a Radiotron Designers Handbook probably preceeding the 4th edition which I have at hand.

You can find references to that circuit in both the 1941 Radiotron 6V6 datasheet and the 1944 AWV/Radiotron 6V6GT datasheet superseeding the 1941 issue.

http://frank.pocnet.net/sheets/084/6/6V6GT.pdf

Thank you very much,

Tom

Conrad Hoffman · 25th December 2011, 08:02 PM

Hi Tom,

I just checked my 3rd edition (very small) and the only reference is to something like A145. My huge red 4th edition shows A515. (hopefully I got the numbers right between the basement and the computer) My guess is it was in some data sheet or application note because unless I have some "mini" 3rd edition, there just wasn't that much in the earlier editions, and almost nothing using the numbering scheme given. Everything is figure this and figure that. Sorry.

taj · 26th December 2011, 07:21 PM

I could be wrong, but I believe these articles came from Radiotronics Magazine, rather than the RDH (same publisher I assume). I cannot, however, find much evidence of any remaining issues of the magazine on the internet other than some nuggets like the A515 (Williamson amp) article.

..Todd

Tubes4e4 · 31st December 2011, 09:32 AM

Gentlemen,

thank you for your investigations. I kept on searching myself, but couldn't come up with a schematic either. The closest thing was another very early Radiotron schematic using 6L6 instead, but obviously also using the screen grid feed potentiometer method as mentioned in the AVW 6V6 datasheet.

Happy new year to all!

Tom

trobbins · 31st December 2011, 12:13 PM

You could try posting on an Australian radio forum (eg. Oz-Wireless : Australian Wireless Chat) - some old timers may have a collection of Radiotronics.

thevoice · 3rd January 2012, 02:43 AM

I suspect I may have this, as I have many issues of Radiotronics. I won't know until I'm out where they are kept next week though.

25th December 2011, 07:26 PM	#1
Tubes4e4 diyAudio Member Join Date: Jul 2005 Location: Leverkusen	Radiotron A504 amplifier schematic Gentlemen, I am seaching for the Radiotron A504 amplifier schematic. I suspect that it was a rather early 6V6 push pull amplifier, likely published in a Radiotron Designers Handbook probably preceeding the 4th edition which I have at hand. You can find references to that circuit in both the 1941 Radiotron 6V6 datasheet and the 1944 AWV/Radiotron 6V6GT datasheet superseeding the 1941 issue. http://frank.pocnet.net/sheets/084/6/6V6GT.pdf Thank you very much, Tom __________________ If in doubt, just measure.

25th December 2011, 08:02 PM	#2
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	Hi Tom, I just checked my 3rd edition (very small) and the only reference is to something like A145. My huge red 4th edition shows A515. (hopefully I got the numbers right between the basement and the computer) My guess is it was in some data sheet or application note because unless I have some "mini" 3rd edition, there just wasn't that much in the earlier editions, and almost nothing using the numbering scheme given. Everything is figure this and figure that. Sorry. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

31st December 2011, 09:32 AM	#4
Tubes4e4 diyAudio Member Join Date: Jul 2005 Location: Leverkusen	Gentlemen, thank you for your investigations. I kept on searching myself, but couldn't come up with a schematic either. The closest thing was another very early Radiotron schematic using 6L6 instead, but obviously also using the screen grid feed potentiometer method as mentioned in the AVW 6V6 datasheet. Happy new year to all! Tom __________________ If in doubt, just measure.

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26th December 2011, 07:21 PM	#3
taj diyAudio Member Join Date: Feb 2005	I could be wrong, but I believe these articles came from Radiotronics Magazine, rather than the RDH (same publisher I assume). I cannot, however, find much evidence of any remaining issues of the magazine on the internet other than some nuggets like the A515 (Williamson amp) article. ..Todd

31st December 2011, 12:13 PM	#5
trobbins diyAudio Member Join Date: Feb 2009 Location: Melbourne, Oz	You could try posting on an Australian radio forum (eg. Oz-Wireless : Australian Wireless Chat) - some old timers may have a collection of Radiotronics.

3rd January 2012, 02:43 AM	#6
thevoice diyAudio Member Join Date: Mar 2005 Location: Melbourne Again	I suspect I may have this, as I have many issues of Radiotronics. I won't know until I'm out where they are kept next week though.

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