Audio Horizons TP 2.0 Preamplifier

I use the Audio Horizons tube DAC, the preamplifier, and interconnects in my system. I've used them for nearly three years. All of the products have been completely trouble-free. They always turn on; there are no extraneous noises.

Is my experience typical? Are these products uncommonly reliable as well as uncommonly musical?

I have also had no trouble in the two years with the 2.0 preamp - just the way I like it!

Never had any problems in the two-plus years I've had my TP 2.0n preamp. Just as musical as the first day I received it. I'm still using the same tubes as well and I have put many hours on my preamp. I'm wondering if Joseph designed the circuit to put minimal stress on the tubes. I've thought of getting a good tube tester to check from time to time how much life is left on the tubes, but I'd imagine that I'll know when they start making noise and/or start losing their wonderful sound. Maybe Joseph or Victor can tell us what signs to listen for to let us know when the tubes need to be replaced.

Hi everyone,I'm looking for some insight into a technical glitch.I acquired an AH TP 2.0,upgraded to 2.1 status,for a friend.It apparently has a 60 cycle hum which is only noticeable when you stand by the unit and not in the listening position.Well you know how that goes it's driving him nuts.Any insight would be helpful and a pm would be fine.

Markwatkiss is it humming with no inputs connected.

I also have been enjoying my AH without any problems just great musical enjoyment. Though i am using Siemans cca i am looking into trying different tubes to hear what Telefunken and others would bring.

Its been a while since the announcement of upgrade to 2.1 by Joseph is any word known on this upgrade.