Audio Horizons TP 2.0 Preamplifier

Thanx for your concern everyone,awaiting response from Joseph and company.

The Russian tube that is a replacement for the 6922/6DJ8 is the 6N23P, which is an excellent tube and well worth trying. I don't own this preamp but I have used this tube in a Music Reference RM-9 as a replacement driver for NOS Siemens and I was completely surprised at how well this tube sounded.

Clio09. I believe it's the 6H23P. There are a couple other russian 6922's but the 6H23P is the highest military grade. I just ordered a cyro'd matched pair of this tube from tubeman.com. He claims they're much improved with the cryo treatment.
I also just received a matched quad of NOS 6H30P-DR's. I don't know alot about tubes but I just happened to research these two tubes this past week.
Frank

Sherod
Thanks for the cca reference. I inquired and he wants $1,250 USD for a quad matched within 5%. Mark, keep us posted on your Russian tubes.
I have now compared two seperate sets of early cca Siemens, to Telefunkens, early Siemens E88cc, and Amperex PQ white labels and feel strongly that the cca's were significantly better than the rest with finer inner detail, ability to distinguish timber, control, finese, and a more holgraphich sound stage with better air around instruments. The other three types were all much better than the stock EH and had some nice points as well with the early Telefunkens coming in second in my preference.

Frankg,

I have seen them listed both ways. Evidently this has something to do with the Russian alphabet where the letter H is represented in the English alphabet as an N. Great tubes for the price nonetheless.