12AX7 tube alternatives for Jolida JD-100

Sylvania 5751 3 Mica Black plates...in my Thor linestage .....Awesome tube......

I've tried a few of the popular old and new 12ax7/5751 tubes in my JD100, and in the long run, I stuck with the new Sovtek 12ax7lps. Maybe not the best overall tone, but the dynamics are much closer to "lifelike", over anything I've tried. And, they're very quiet.

Some people claim the earlier production ones are better then the newer ones. Mine are year 2000.

An old tube equipment builder/tech suggested to me to try some 12BZ7's, for some real dynamics, but I'm not sure how the JD100 would react to the additional draw, and since they are taller, I don't think they would clear the top cover.

I tried the Sylvania 5751 triple mica black plate and loved the richness, but not the heavy bottom end. Went back to the Svetlana 12ax7's until someone posted something about the Chinese Full Music 12ax7's. I bought a pair for around 70 dollars, and found they were very comparable to the Sylvanias, but balanced across the board in my system. Sold the Sylvanias, love the Full Music!

I'd also consider ECC803S

Best,

Alex Peychev

Rooski-

I googled 12BH7s and found interesting info about them. They have equal gain (mu) to 12AX7 but draw twice plate current and give off a lot of heat.

People who have used them in Jolida amps say they increase the soundstage and are more dynamic.

Also, Cary six-pac owners use them because they increase watt output and decrease distortion.

Like you I don't think I would use them because I'm not sure how the circuitry would respond to extra heat current.

Also because of their size they are microphonic, but that can be tamed by using a Herbie's Halo.