Yes, sorry, R11, R14."Protection: These amplifiers work with transformers, meaning a highly inductive load when the output of the transformer is open. Inductive load can return back-EMF voltage. The danger here is having the emitter voltage higher than the collector voltage forQ4 and the opposite for Q7. Having a current trough D2 by excessive output voltage will block transistor Q4. The resistors R13 and R15 provide some guard to the transistors in such events plus additional current surge defense"
R15-- or R12?
Incredible workHello,
I just finished summalysing my thoughts about Melcor 1731 amplifier, file attached. Comments are welcome.
I think i can do the same for API 2520 with help from you, fellows.
BR
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