Can anyone help me biasing a Jadis Defy 7?

Almarg, it is a truly great amp and one of the best I've ever heard. Biasing is a pain but the sound is worth it.

Wendell

Thanks Wendell. Yes I'm sure it is a magnificent sounding amp, and I mis-phrased my comment, which was not intended to be pejorative in any way.

Regards,
-- Al

Well... I spoke with Brooks Berdan and he shed a whole new light on the particular Defy. It has the s/n 213 and it turns out that Jadis built all defy-7 amps from something like s/n 200 to s/n 399 a little bit different.
On these amps, you do not bias by measuring voltage between chassis and fuse. You measure across a greenish brown 1.5 ohm resister that sits under the power tubes.
You have to aim for 33 mv.
You also have to swap tubes around to try to get the best match while biasing. I am glad to have read the previous posts and hear that the lengthy biasing procedure will be worth the effort.
Thanks folks.

Mattzack2-
If you bought matched tubes as I suggested, you should be able to keep them together and avoid a lot of the hassle in Schipo's post. The pot sets the bias voltage, and if the tubes are closely matched the voltage readings should be nearly equal. Ultimately they should be close to achieve maximum power, but will work if it isn't. What you are doing is measuring the idle current flowing through a resistor via the voltage drop across that resistor.

It will be worth the effort, that midrange is fabulous.

Did own the Mk4 and to be sure I never attempted any such adjustments. And yes, I did buy mine from Brooks and brought it in for service.--The best service and waaaay; the price. A hard combo to beat in this day of "stone handed" over charging repair guys. It was this amp's lack of user biasing that sent me to the CJ 8's.
Side note;ain't this a great site where such information is shared? U-bet.