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RE: Question re: replacing 12AX7 with lower gain 5751

I've used 5751's a few times in place of 12AX7.

Based on my experience, I think the answer to all your questions is yes, maybe. Depends on where in the circuit or in the system you put them.

My preamp, in the final output, I did have to use a higher setting on the volume control to get the same SPL out of the speakers.

In my tubed CD player I noticed virtually no difference except a slightly softer presentation.

Tell your buddy to give them a try. It wont really hurt anything. Although what Ivan said about phono is good advice.



Edits: 08/24/21

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