Hi Rick,
no idea about these amps but from fooling with the Audiopax, if you can use 12 AT7's as prior post, try some CV 455s. Some nos Mullard CV455s make the CV4204s? or whatever my Pax came with sound positively broken.
Failing that the engineer I use worked at Abbey Road Studios
and although the only authorised repairer for Audio Note uk,
his real labour of love is band gear.
Get it performing to original spec and leave as is
no idea about these amps but from fooling with the Audiopax, if you can use 12 AT7's as prior post, try some CV 455s. Some nos Mullard CV455s make the CV4204s? or whatever my Pax came with sound positively broken.
Failing that the engineer I use worked at Abbey Road Studios
and although the only authorised repairer for Audio Note uk,
his real labour of love is band gear.
Get it performing to original spec and leave as is