Audio Horizons TP 2.0 Preamplifier

i'm curious, IIRC tubes 1& 3 are signal gain, but 2 & 4 are for bias. did anyone find benefit from rolling 2 & 4?

Rhyno,
Rolling tubes in 2 and 4 also made a difference to my ears. Joseph told me from day one that 1 and 3 were more critical to the sound, but 2 and 4 also play a role in the overall sonics, IMHO. (o:

Recently I aquired a AH TP2.0. This particular one has no output transformers. Were these transformers offered as an upgrade at the time of its conception?

I am not sure but Victor, AH's representative is happy is answer all questions [email protected] Hope this helps

Phd,
I think you are referring to the output transformers that would be used for balanced output. Yes, the output transformers were an upgrade from the base model. I think you could have your unit modified by Joseph. As Gammajo suggested, talk with Victor.