re the PIO caps - they were cheap until guitar amp suppliers in the USA decided to monopolize the market and bought out nearly all suppliers stock. You can guess what happened next. They can be found in their online catalogs beside pics of hot babes curling up around guitars and the usual assortment of silly adjectives trumpeting their tonal virtues . . . . . at double or triple the price you could originally get them from the Soviet suppliers. (For those responsible who might come here from time to time to read - Thanks a lot for the ruination!) Don't know if that happened with tubes yet or not but probably just a matter of time.