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Cathode Modulating 2x 810's




 
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Author Topic: Cathode Modulating 2x 810's  (Read 197 times)
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W4RFM
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« on: November 03, 2020, 04:32:45 PM »

So I am looking at an old copy of QST, April 1940 to be exact, and I see this.  What are your thoughts and opinions?


Interesting that the mod iron impedance is almost exactly that of a Heathkit Apache 11K / 3K.
I just checked (the Bay) and 809's are still available, although i am sure a later /better pair of tubes could be used.
810's are there also but both types are a little spendy, for my taste.
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BOB / W4RFM  \\\\\\\"I have looked far and wide, (I also checked near and narrow)\\\\\\\"
WD5JKO
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« Reply #1 on: November 04, 2020, 08:19:39 AM »


good reference thread on CM:
http://amfone.net/Amforum/index.php?topic=45471.0
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