Mysterious connection in kathode circuit to OPT

SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

Hello,

I have a 300B tube amplifier and was curious about the schematic. I measured it myself and quickly have put it to paper.

Attached is an excerpt - the output section only.

Everything very straight forward (heater is DC heated) - however, there is a strange connection of two thin cables in the cathode circuit (on the picture with the question mark) which both lead somewhere into the output transforer. The DC resistance between those two connections is nearly 0 Ohms so I gues its some kind of extra winding in the OPT?

Could it be some kind of negative feedback or is it a protection circuit if no loudspeakers are connected or like that?

Any ideas?

Kind regards,

Günther

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The Cable Cooker

Topic - Mysterious connection in kathode circuit to OPT - Gwaltinger 12:36:03 06/21/24 (3)

RE: Mysterious connection in kathode circuit to OPT - Paul Joppa 06:49:40 06/22/24 (2)

RE: Mysterious connection in kathode circuit to OPT - Gwaltinger 07:50:03 06/22/24 (1)

RE: Mysterious connection in kathode circuit to OPT - Paul Joppa 08:47:34 06/22/24 (0)

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