READ THIS it is pretty much spot on, apart from different types and quality of caps do sound different.
Your chances of finding a bad cap of any type in an NVA amp, even 30 years old, is next to nil ! as we use well over specced capacitors for all uses and never subject them to high heat. Your only danger is capacitors drying out or rotting in a damp environment when not used for years, and I mean years.
I had an AP80 back here that had been stored for about a decade in damp and cold conditions and even most of the solder joints had rotted. The amp had to be completely rebuilt. Treat the amp with respect, store it with respect if needed, and it will go on working for your lifetime.
It needs REPAIR that is not SERVICE. IF you want it repaired then send it back.kellerist wrote: ↑Thu Jun 28, 2018 7:57 pmWhy? For example both the input selector and volume control of my AP50 are weared, and for some reason 2 inputs are working well, the others make a loud buzz. I bought it second hand from you, without any problem, and it worked until I was able to buy a new system. Survived movings and storing, I feel somehow that I don’t want to sell it in this condition for peanuts (like throwing away), but want to fix the problems instead and keep it for a second system in my room. I don’t know if capacitors are involved in any issue or not.
And if an amplifier actually benefits from a so called service it means it was badly designed or made in the first place.
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NVA are kind on their supply caps, but not everyone was in the past (Quad, MF, Krell due to heat...) and some amps are almost designed to stress electrolytics on the main boards too (why do you think old Naims drift off so? I think latest production 'may' have sorted it but not sure)
The only things I have found that they have failed on and have had to be replaced in is in early cd players and in dd turntables. Never in an amp. This has been due to heat, some dried out, and the fact that the caps were specced at very close to the operating voltage with only a few v wiggle room. Being hit with a much higher voltage than the spec is for a couple of times over the lifespan doesnt do them much good, and it's inevitable that this will happen at some point.
There is no such thing as a service for a piece of electronics, it either works or it doesn't. If it doesn't work, then fix it. If it does, changing caps can alter the sound. But it isn't a service, its an 'alteration.
Caps do have a sound, that is what people hear when re caps are done. its not like having new shocks put on on a car to replace nasty old leaky ones and suddenly its no longer a wallowy barge any more and it back to handling nicely again.....
BTE designs type 1 mk2 passive pre, PASS F5 dual mono, modified Philips cd371, Metronome 'M' speakers, BTE designs balanced power supply, Benedict Audio hothead (mm) musical fidelity x-lps (mc) mac mini + beresford tc7510