"Would upgrading the input tubes (12ax7) of the power amps provide a bigger improvement (in terms of dynamics) than upgrading the phono stage of the pre?
Nick sr, I think thats almost impossible to determine in advance. I can tell you that the potential for improvement by changing the 12ax7s can be huge. Call a reputable pro who guarantees satisfaction with a credit/swap policy. Ive been most satisfied with Andy at "Vintage Tube Services" and Brent Jessee. Both stand behind their tubes and offer excellent advise. I cant imagine your regretting the calls.
FWIW, I bought my 12ax7s from Brent Jessee.
http://vintagetubeservices.com/
http://www.audiotubes.com/12ax7.htm
Nick sr, I think thats almost impossible to determine in advance. I can tell you that the potential for improvement by changing the 12ax7s can be huge. Call a reputable pro who guarantees satisfaction with a credit/swap policy. Ive been most satisfied with Andy at "Vintage Tube Services" and Brent Jessee. Both stand behind their tubes and offer excellent advise. I cant imagine your regretting the calls.
FWIW, I bought my 12ax7s from Brent Jessee.
http://vintagetubeservices.com/
http://www.audiotubes.com/12ax7.htm