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General question about restoring a vintage amplifier

Solid State | Audiokarma Home Audio Stereo Discussion Forums - audiokarma.org
hi:

I have some general question about restoring a vintage amplifier for long term usage. suppose I have a working vintage amplifier. I guess I would do recapping. So when we do recapping. we only need to replace all the electrolytic capacitors only? what about other such as cermic disc capacitor? I know that almost nobody replace film capacitor unless they want to upgrade to some kind of cap like auricap. Why people usually only replace electrolytic capacitor but not other.

Second question. Why people usually do not replace the power transistors (maybe I should say transistor in general) since new transistor has better SPEC than those that was make in the old day. What is the reason for that? I found that people usually do not replaced them unless it is necessary.

when we need to replace a power transistor. I did not see any people talk about they need to be matched. So when we replace power transistor, do we need to match them?

When we replace the power supply filter cap. there are some people put a small resistor between the two pole of the power supply capacitor to remove the energy that is stored in the cap when the amp is shut off. however, there are also some people put a small capacitor (like 1uF file cap) between the two pole. what is the purpose of this small cap? and what happen if I put both the small cap and the resistor??

thanks a lot

 


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