Servicing an HD-130 head. No reverb with 12AX7 driver.
Recapped it, had symptom of "cuts out randomly" from before recap.
So I find a bad LM307H in ch2, think that's it. Replace it, but then another one fails. This continues.
Then I check my voltages (should have done this sooner).
Seems the LM307H's are getting +/- 46v
Someone in the past has replaced the two zeners with 1n4007's
I'm guessing my problem is that the zeners are what gets me down to +/-16v, correct?
Hoping someone confirms my suspicion before placing another parts order.
Thanks, just found this forum and it's a great wealth of info.
Edit to also ask: is the 1n4745 the correct replacement? It's not labeled on my schematic but I see it on several others and it seems to fit the bill. Is there any reason that a 5w 18v zener would be a bad idea? Lack of protection in case of a fault?