Jadis Defy 7

I think you need to re-bias the amp to change the tube type, it's not like the mono amps (JA-30/80/200) which have an auto-bias and can accept various types of tubes without any adjustment. Can't tell you how to bias the amp, though.

Any Jadis experts here? please I could with some help on how to re-bias the Jadis Defy7.

Thanks,
Satyam.

If no one else responds, I'd either contact Jadis directly via e-mail on their website (they have been helpful to me in the past) or, if you're in North America, perhaps Pierre Gabriel, the importer. Does your seller know how to bias the tubes?

Satyam, you have to turn the amp on its side and remove the bottom plate. You will see 12 fuses (4 rows of 3). At the end of each row, there is a small round dial. This dial controls the bias for the 3 tubes that are in that row. You cannot bias each tube individually, this is why the tubes must be matched. With a volt meter, attach the ground to the metal chasis and the positive to the metal part of the fuse holder of the tube you are biasing, then slowly turn the bias dial until you are at the proper bias which I beleive is 4 volts. Just remember that the bias dial affects all 3 tubes in that row, so it is almost impossibe to get all 3 at exactly 4 volts. Repeat this proceedure for the other 3 rows of tubes. Caution, I am not a technican, just a former defy 7 owner. This proceedure worked for me. Good luck. Let me know if it worked

Heyy,

Thanks guys I checked this thread after long was out of town, I also got a mail from jadis with the pics but no explanation as to how to go about it. Will try it tonight maybe and report back.

Thank you again Jazz_nut and Rcprince,
Regards,
Satyam

Depending on where you live? for me the choice in Southern California for Jadis was easy, it's Brooks Berdan LTD. he's a wizard with them! give him a call, or e-mail them.