Electronics > Projects, Designs, and Technical Stuff

Tube circuit

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ELS122:
can you explain why are there multiple capacitors on the cathode for the left side of the 6N2P tube

T3sl4co1l:
Negative feedback, the 150p is compensation.

Tim

001:
it is not more when some sort of fixed equaliser, isn`t it?
 

ELS122:
so can I just bypass it and put a 2k resistor to make it just a regular amp whit no tone control?

T3sl4co1l:
Weird... they put the tone control, inside the feedback loop?  But most of the feedback is also bypassed away by the 15.0 cap.  So it really shouldn't do much of anything.  But then why connect it at all?

Maybe they just needed to use up more capacitors...

Anyway, cutting out the two extra(?) pots and the tone circuit, so the 6N2P left plate is cap-coupled to the right grid, is enough to do that.  Then probably cutting the 15u cap and adjusting feedback values, would get a pretty ordinary amp with flat response and modest overall gain.

Tim

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