Hello and thanks for letting me become a new member to the forum. I have recently joined the Kustom club with a Charcoal Sparkle K100-1 with 2X15 Jensen cab, and and Black K200B-1 with 2X15 CTS cab. I am familiar with servicing vintage Fender amps. Transistors are a new challenge for me. My question is, as a rule do you guys go through your amps and replace/upgrade certain components immediately, or is it more or less a "change things if it is noisy" type thing? My tech skills involve "shotgunning" most things, rather than testing for leaky caps, etc. With Fenders you know the electrolytics most often need replaced, etc. Are there general rules for Kustoms?