AVA Dynaco Super Pas 3 rectifier keeps going bad

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As the subject says, I have a AVA Dynaco Super Pas 3 and the rectifier keeps going bad. I've replaced it at least three times in approximately the last 2 years. I made a note that I last replaced the rectifier on 9/25/2023 and it is now exhibiting the typical issue: I will hear a hissing (or "whooshing") noise after I power up the preamp, then the amp (an Odyssey Khartago). This fades away in about 30 seconds. Days after that, I will notice a dramatic loss of volume in one channel. The last time this happened, I replaced all tubes except the rectifier and there was no change. I replaced the rectifier, kept the new tubes in, and it was back to normal. I replaced the new tubes with the old tubes, keeping the new rectifier, and all was still good. Important: I am not a DIYer, have no skills in troubleshooting. But... what could cause such a problem? TIA

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Parts Connexion

Topic - AVA Dynaco Super Pas 3 rectifier keeps going bad - JHugh 20:01:21 11/22/23 (3)

Possibly high voltages at the 12X4, or bad cap(s) in the power supply - 1973shovel 04:54:01 11/23/23 (2)

RE: Possibly high voltages at the 12X4, or bad cap(s) in the power supply - JHugh 11:26:18 11/28/23 (1)

Well, if you're not comfortable taking high voltage measurements... - 1973shovel 12:18:09 11/30/23 (0)

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