In Reply to: HF81 posted by marc-homeslice on December 6, 2004 at 08:12:17:
They were designed for computer service. They have lower gain than a 12AX7 but otherwise are very close. Really is a better tube than a 12AX7. I'd leave the tubes in the phono stage alone.
Russ
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Follow Ups
- You might try 5751 tubes in the HF85 - Russ57 12/6/0409:45:11 12/6/04 (0)