Vh, Ih, VaMax, PaMax, Cgk, Cak, Cga. , , , , , /, , , , , , /, 12BH7 Application Data. Va, Vg1, Ia, Ra, S. The 12BH7 double triode is pin compatible with the ECC81, ECC82 and ECC83 series References: Datasheet &. Type 12BH7 was first introduced in The 12BH7 double triode is pin compatible with the ECC81,2,3 series from Mullard but References: Datasheet &. Type 12BH7 was first introduced in .

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The schematic may very well be correct On my schematic the hand written voltage looks like maybe Well, it wouldn’t be the first time a tube was run outside its design center maximum in a commercial product.

The schematic 12bb7 at Waltzing Bear is dead, do you have another link?

(PDF) 12BH7-A Datasheet PDF Download – Twin Triode

Double click on above image to view full picture. Started by Fablab The Lab. Each triode of the preamp tube has matching gain. The 12BH7 can lend a wonderful life to the tone that sounds great for jazz or vocals.


For most circuits this should be well within the tolerances of the dxtasheet, but you can ask the manufacturer to be sure.

JJ Electronic – 12BH7-A

With respect to audio reproduction there is a fairly large difference between these three tubes. Drip limiter for Mastering?

Power dissipated in each triode: Write Your Own Review Only registered users can write reviews. Please, log in or register. Started by dalmaproductions The Lab. Anonymous February 1, at 2: A lot of people like Amperex, but they work best in a system that is not forward or bright as they add life to the midrange.

However, there is a different heater pin out. I usually use power potentiometers as plate resistors and just turn until I think it sounds as I want it. It’s not so rare so I’d think someone here has it.

Tubes that measured to have higher gain. Made in Russia, these premium driver tubes are compatible with any 12BH7 tube. Medium-Mu twin triode driver tube with 3. When deciding what’s best for you, the following notes may be helpful: Some seem to take more than others, but you can be sure it’s going to shorten life. They all sound best with a good deal of current running trough them.


Shared cathode resistor R for both halves of the 12BH7.

If you need help write me via http: Quick Overview Premium driver tube for Hi-fi tube amps. Daniel November 5, at 5: If you don’t want to modify the circuit and are unhappy with your 12AUthis is a good choice.

JJ 12BH7-A Preamp Tube

This is not seen in a lot of commercial gear, lotsa tube exchange: Late Distortion Groove Tubes – is chosen for those who want their sound dynamic and clean – especially Jazz and Bass players. ECC8X stuff is not and not very good sounding either. And yes, I have blown a few tubes, but they sure can take a beating!

Not clear, but even then the tube is 3.

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