Jadis amps and pre-amps still competitive?

Trelja: A friend here also applied some bias adjustment to his DA5 amps following Jadis instructions. I am not a tube expert (my friend is), but I remember he placed the bias just in the upper limit for the EL34 and sound immproved a lot for the good.

Fernando

Flg2001, the DA5 is not autobias? I always thought that outside of the Orchestra and Orchestra Reference were autobias.

Although, I may know what you are talking about. I used to read that the JA200 had some kind of adjustment for "bias" on the transformer, which technicians would set based on the voltage coming out of your wall (whether it was 115V or 120V).

Nevertheless, as you said, I'm sure the amp sounded good!

Trelja: I have my weekly audio-buddies meeting and will get the specifics for you.

Fernando

I have to echo what Trelja said. I am the lucky new owner of Trelja's Jadis Orchestra Reference in a small office sytem. It has run about 160 hours on the new JJ EL 34 tubes and sounds better and better every day. Despite the accompanying equipment not being of the caliber of my main rig at home, it has a superbly pleasing tone and timbre, and as Trelja has said, the sound is tonally right and it certainly is a match for the much more expensive tube amps.
A wonderful-sounding amp. Of course, the big negative, and the only one, is the biasing issue, which, I suspect, may cost Jadis sales of this glorious piece of equipment.Obviously, it can be done, but is a pain.

Fernando, not Jadis related, but if we are talking of biasing in general, I have always found that my preference is strongly towards running tubes at the higher end of a manufacturer's biasing recommendations. To my ears, the sound takes on a warmer, richer tone. This is but one man's opinion.

It will be interesting to hear what your friend says. Though, the DA5 is the power amp section of the DA30 integrated, which I remember both being autobias.

And, Denis, despite my preference, as you saw in the pictures, I biased your amp dead on at 110 mV (Jadis recommendations: 95 - 120 mV, preferably 110 mv).