The TBX family of radios except for the post war TBX-8 all use just one 837 tube as an oscillator, PA and Modulator. They can run self-excited or use a huge round crystal. I have used TBX-4 and 6 sets before and love the prewar design with the receiver having
no AVC but only requiring two volts and ninety volts at under ten Ma. Have a TBX-4 that I may have to put together for a base at Hamvention this year.
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I would like to retain the single - tube nature of the Conar transmitter. This has certain bragging rights. If it means i must
use old - stock FT-243s, so be it. I will be carefull.
This topic has me wondering about a tube company ad on the back of a CQ magazine. It showed a single 813 tube "power
oscillator". No - not a MOPA; just one tube. How did they do that, i wondered. Without immediately cracking the crystal.