Audio Horizons TP 2.0 Preamplifier

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 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.

I had the privilege of beta testing a new product from Audio Horizons a while back. It is the RTS coupler which has just been listed on A’gon last Sunday.

As a long time user of Audio Horizons products (2.0 preamp upgraded to 2.2 and 3.0 DAC upgraded to 3.1) I have always been so impressed with what Joseph and Victor have created. Of course we all know that their customer service is second to none.

I would encourage all of you to go to the ad for the RTS coupler and check it out. I won’t reiterate my comments about the product here as they are clearly elucidated in the ad. IMO, it is an amazing product that warrants an audition. I know that I could not be without it (actually I have several in the system).