Yes, indeed. I may have already mentioned, I replaced the quad cap in mine primarily because a new one was available with slightly improved specs, and I really didn't have a way to test the existing one at working Voltage. As far as I know, the original is still a working part and had exhibited no sign of failure after 40+ years.
I would hazard a guess that the longevity may depend on its lifetime: If it got regular use, it probably stands a better chance than one which sat for years without a charge. I had no idea which might describe mine, so I took the precaution of bringing it up very slowly over a period of many days with a Variac and a solid-state replacement in the rectifier socket so that it started getting Voltage at a very low level relative to a vacuum tube rectifier.
I have no idea if this was necessary, but the cap appeared to work very well.
I am happy to hear you are enjoying your ST-70; mine has brought me many hours of pleasure.
I would hazard a guess that the longevity may depend on its lifetime: If it got regular use, it probably stands a better chance than one which sat for years without a charge. I had no idea which might describe mine, so I took the precaution of bringing it up very slowly over a period of many days with a Variac and a solid-state replacement in the rectifier socket so that it started getting Voltage at a very low level relative to a vacuum tube rectifier.
I have no idea if this was necessary, but the cap appeared to work very well.
I am happy to hear you are enjoying your ST-70; mine has brought me many hours of pleasure.