Can anyone help me biasing a Jadis Defy 7?

here's another thread on the topic

http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1206759992&openflup&6&4#6

A word about safety, beyond what was said in the article Schipo quoted. And this is particularly applicable if you are using an uninsulated metallic screwdriver to adjust the bias pots.

There is an old adage that when working under the chassis of powered up tube equipment you should have one hand tied behind your back. Obviously you don't literally have to do that, but the point is that if the hand you are doing the work with, or a conductive object that it is holding, were to inadvertently come in contact with high voltage you MUST not simultaneously have your other hand, or any other part of your body, in contact with the chassis, or with any other circuit point or conductive surface.

The reason, of course, being that if one hand is in contact with high voltage, and the other hand is in contact with ground or some significantly different voltage, there would be a large flow of current directly through your body.

Best regards,
-- Al

Schipo, loved your post, so funny but so true.

I once had Defy 7 monoblocks, if you can imagine twice the headache. I took it a step further with output tube rolling and once reaching that, found I didn't care the sound of the amps and sold them.

I remember backs in the mid 1990s taking my Defy 7 to Brooks to retube,setup..It cost me over $800 for 12 matched 6550s and pre tubes,and that was a good guy cash under the table deal..Sold it shortly after that and went solid state. Never looked back,lol

Still having a rough time shifting these tube around and trying to find some balance. The voltages are ranging from in the 3 volt range up to the 7 volt range..... it seems that when I finally get 6 tubes close to 5 volts, the remaining tubes I have left are (at this point in time), not going to be able to get to being close to 5 volts.

My feeling is that I may not have a matched full set of 12 and instead have 3 matched quads (plus a couple of spares).

If this is the case, am I chasing my tail?