Audio Horizons TP 2.0 Preamplifier

Tvad,
The power amplifiers are SETs. So far, an EL34 (~6 watts per channel) and an 845 (~25 watts per channel).

Has anyone who has had an early 2.0 model had to change out the four E88cc tubes yet? Mine are still original Siemens Cca and I don't have a clue how many hours I have on them. I'm curious what to listen for when the tubes are showing their age and need replaced. I'm trying to get the most out of my tubes because they are rare NOS and expensive.

I'm curious what to listen for when the tubes are showing their age and need replaced. I'm trying to get the most out of my tubes because they are rare NOS and expensive.
Sherod (Threads | Answers)

One indicator is buzz and/or hum that was not present before.

Another is loss of high end extension, but this is difficult to detect over the long term because it begins the moment the tubes are installed.

The best way to know is to test them with a tube tester. At the price of NOS CCa tubes, a tube tester like a B&K 606 is a small investment.

I have been contemplating getting a decent tube tester. Maybe I'll start looking for a good used one. Thanks.

A review of the new TP 2.2 preamplifier has been published at Positive Feedback Online. Here is the link:
http://www.positive-feedback.com/Issue49/tp2.htm

The review is very favorable. Here is the thesis of it.

"I've not come across a product that challenges my notion of what one is paying for, and what one is paying extra for. And let me cut to the chase: this may be the best value in all of high-end audio."

Ryan Coleman is the reviewer.