I bought my Cal unit from Galen Carol Audio.
At that time, he ststed(and I purchased) a matched
set of low noise RCA 5751's. They sound much better
than the stock tubes and only(?) cost $20 each. I also
have a VAC and Aronov tube preamps so I have tried
NOS tubes of different makes in the Cal. I always
return to the5751's. It is a matter of personal
taste in sound and your system in general. I have also
heard the upgrade degrades the overall sound quality.
I am putting my $450 plus shipping towards either an
EMC-1 or Audiomeca unit.If you have the matching Cal drive,
it reportedly won't read 24/96 formated disc's. You will also need a new transport. Buy a new player and save thecost of a better drive and cable.
At that time, he ststed(and I purchased) a matched
set of low noise RCA 5751's. They sound much better
than the stock tubes and only(?) cost $20 each. I also
have a VAC and Aronov tube preamps so I have tried
NOS tubes of different makes in the Cal. I always
return to the5751's. It is a matter of personal
taste in sound and your system in general. I have also
heard the upgrade degrades the overall sound quality.
I am putting my $450 plus shipping towards either an
EMC-1 or Audiomeca unit.If you have the matching Cal drive,
it reportedly won't read 24/96 formated disc's. You will also need a new transport. Buy a new player and save thecost of a better drive and cable.