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NOS 12AX7s are getting rare and expensive. If you don't mind rubbed off labels and such, you might avail yourself to Audiotubes.net (no affiliation) . He calls them ugly but the prices are very fair. If buying new consider the Gold lion or the more economical current production Tung Sols.
For the output tubes I love the current Gold Lion KT-88s.
Something else to be considered, given the advanced age of your components, if it hasn’t already been addressed. The higher the power supply impedance, the worse the peak compression and bass performance. The older/dryer the electrolytic caps, the lower their value/the higher their internal(and hence, your PS’s) impedance. As far as the rest of the system’s performance, there are a lot of electrolytic caps, and carbon comp resistors in these older gems. Replacement with film caps and wire wounds, will generally offer a substantial improvement in overall presentation.
Thanks for the tube and other advice. I think rodman had the best advice. I have had it gone over by a tech previously and about 12 capacitors and 6 resistors were replaced In the amp. There are still many original caps and parts that should be replaced. It will be a while before I get the time and courage to dig into that myself or the money to have someone else tackle it since it mre than simple tubes and Tweaks.
If anyone else out there has ideas, let me know. I'll update or aastart a new thread when i get back too it.
Thanks again to all for your comments.