Want to upgrade 12ax7's on Jadis OR

12ax7 Amperex Bugle Boy - Tungsram ( hungary ) 12ax7 and for 5751 RCA 3 mica Black plate ( warm ) GE 5751 black plate ( neutral ) ...All great tubes more of a system synergy issue..

New pruduction 12ax7 I like the Ei Cryo 12ax7 from ( tubedepot.com )

I found Brent Jessee, a tube dealer close to Chicago in Hoffman Estates who has a great selection on tubes and gives a 30 day full trade in on his sales. I have chosen a matched pair of 12AX7 Telefunken ribbed plate, diamond mark,for $175. They sound very good, even at a very low volume.

This is my first tube swap and I can hear a difference in the cleaness of the highs and the overall improvement in the soundstage.

He suggested possibly trying out some NOS KT88's. I just bought some new Russian Genelex Gold Lions and he said that they are OK, but not in the same league as some of the older KT88 from the 60's. So I may be selling my Genelex on Audiogon pretty soon.

This seems like a way to slowly upgrade to some of the more expensive Amperex tubes that have been suggested.

does penta labs make 12ax7`s and if yes are they any good
al

I have not heard them, but I Googled and found then on Doug's Tubes. They seem fairly inexpensive and the are reported to be used on high end recording gear.

Hope this helps.

Matt

Went through several different 12AX7's in my phono stage (Hagerman Trumpet) recently that were loaned by a friend who has a stock. I liked the Tung Sol 12AX7's the best. Detailed, open with no grunge but still musical.

I also heard RCA black plate 5751's (2 mica version) and was not overly impressed. They definitely had lower gain but were fairly average sounding in my Trumpet. May be better elsewhere.

There was a Baldwin organ pull 12AX7 (not sure who made this and I've never seen it before) that had a lot of punch with an open and very clear top end. However, the mid bass was a little plumy and slow. But not a bad tube if you need a little warmth.

Bob