[Milsurplus] Hey Bob, W9RAN

[Ray Fantini]

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.

Ray F/KA3EKH

________________________________
From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> on behalf of Hubert Miller <Kargo_cult at msn.com>
Sent: Wednesday, January 7, 2026 9:23 PM
To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] Hey Bob, W9RAN

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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.

I recall many decades ago in high school, i was taking some kind of electronics class. There was some breadboard circuit
prototyping kit and i had from somewhere, a crystal for the AM broadcast band. I built up a single tube, something like
6DQ6 tube, power oscillator transmitter. How long did that last ? About long enough to send one line of text CW; then
the crystal, no more work.
-Hue Miller
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