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Originally Posted by Michael Maurice
My first rule when servicing these types of amplifier is to change the coupling caps to the output valves. I also replace as a matter of course the grid leak resistors and if they are out of spec the phase splitters anode load resistors. This is non negotiable. SERIOUS DAMAGE CAN OCCUR IF THESE COMPONENTS ARE NOT REPLACED.
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confirmed hence why its best not to power these up just yet!
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In fact I go further with this, I replace all old paper /wax, Hunts mouldseals and anything that looks suspicious.
I use vishay 2W metal resistors rated at 500V and Vishay axial capacitors rated at either 400V or 630V polyester types and Vishay electrolytic capacitors.
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I think to be safe all the components should be changed, it would be nice if most of them were still in range. I always wonder if there is a difference in sound with the type of capacitors used i.e PIO, Poly etc
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They are fairly simple amplifiers that are easily serviced, but do sound good when working.
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[B]You are actually close to me, I am based in NW London Hendon so I will keep your details handy!