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lesmw0sec · 17th Apr 2018, 9:19 am

Is the cathode resistor bypassed by a large cap? If so it would be worth checking, since if dud it would allow some negative feedback which would reduce the gain. You say the cartridge is OK, but I wonder how you established that. A single valve amp like that would require a high output from the cartridge.

17th Apr 2018, 9:19 am	#3
lesmw0sec Octode Join Date: Jul 2009 Location: Carmel, Llannerchymedd, Anglesey, UK. Posts: 1,509	Re: amplifier problem (record player) Is the cathode resistor bypassed by a large cap? If so it would be worth checking, since if dud it would allow some negative feedback which would reduce the gain. You say the cartridge is OK, but I wonder how you established that. A single valve amp like that would require a high output from the cartridge.