I modded my PV10A, would suggest the following based on evolution of my own changes
1) get the CJ replacement transformer, not a substitute
2) replace the big solens caps with Clarity MR caps where space allows these are nicely detailed for sound... Solens wont die with age but are dry/acerbic sounding. if you check your cap voltages, you will likely find that 300v dC rating is adequate in a replacement
3) if the unit has the small white CJ design bypass caps these are likely toast/dulling the highs because of age. replace with VCap like value
4) the stock power supply diode bridge has slow diodes, dulls transients. Replace with avalanche diodes for better transient response
5) add an IEC socket as your existing power cord is probably toast with corrosion inside its wrapper.
If you have the same blue corning resistors as the PV-10A, they are excellent, no reason to replace.
1) get the CJ replacement transformer, not a substitute
2) replace the big solens caps with Clarity MR caps where space allows these are nicely detailed for sound... Solens wont die with age but are dry/acerbic sounding. if you check your cap voltages, you will likely find that 300v dC rating is adequate in a replacement
3) if the unit has the small white CJ design bypass caps these are likely toast/dulling the highs because of age. replace with VCap like value
4) the stock power supply diode bridge has slow diodes, dulls transients. Replace with avalanche diodes for better transient response
5) add an IEC socket as your existing power cord is probably toast with corrosion inside its wrapper.
If you have the same blue corning resistors as the PV-10A, they are excellent, no reason to replace.