I recently acquired a used PH 9.0X phono preamp and
I want to upgrade the Russian 6922 tubes. Anyone have
any experience with this particular preamp? I'll be looking
for NOS tubes.
I owned a 9.0 for a number of years and tried many tubes. If you have a tube rectified power supply I would upgrade with a gz34 metal base. It made the biggest improvement to any component I've ever owned.
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