I have never used the TSR-300 but looks like an interesting box. Dovetron's are fairly easy to trouble shoot but you have to be fond of dual voltage Op Amps as most sets have about 35 or more of em. If an Op Amp goes "South" on the Dovetron it usually blows up or over heats.
I borrowed the RY generator circuit timing idea from the Dovetron board but did not use a 741 because of the dual power supply requirement. I have never seen a piece of equipment with so many op amps.

http://k4che.com/Tempvideo/RTTY%20Mystery%20Project/Mystery%20K4CHE.mp4
k4che

On 9/3/2023 2:30 PM, Nick England wrote:

I picked up a Dovetron at the Shelby hamfest - it has a TSR-300D card that includes regen plus SELCAL - it isn't clear what all the switches do, so if anyone has instructions, that would be very helpful.

There is info on line covering the TSR-200D and TSR-500D but this variant is somewhat different.

This document has a brief description of the various TSR models including page 33 on the 300D.

https://www.qsl.net/w6ger/pdfdocs/dovetron/SelectionGuide.pdf

best regards,

Nick England K4NYW
www.navy-radio.com
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