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Mysterious connection in kathode circuit to OPT
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Posted on June 21, 2024 at 12:36:03 | ||
Posts: 5
Joined: December 3, 2023 |
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 |