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In Reply to: Question re: replacing 12AX7 with lower gain 5751 posted by Byrd69 on August 24, 2021 at 07:52:20:
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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Follow Ups
- RE: Question re: replacing 12AX7 with lower gain 5751 - Sondek 09:46:10 08/24/21 (1)
- RE: Question re: replacing 12AX7 with lower gain 5751 - Tom Bavis 12:42:48 08/24/21 (0)