1. Home
  2. amps-preamps
  3. 1336583789

Jadis OR bias value for Mullard RL34 and KT88 help

I just swapped my Gold Lion (reissue) KT88 tubes for Mullard EL34's and was vwery surprised that the volume was so much lower. I checked the bias and found it to be less than 10mv while the KT88's had been biased at 110mv.
I rebiased the EL34's up to 90mv and the volume increased to what seemed to be "normal".
I am looking for the correct voltage to bias the new EL34 to in a Jadis Orchestra Reference.
Any help is appreciated.
mattzack2
mechans
2,999 posts
 
The fuse ratings are typically on the fuse cover, and then again on the fuse. If all else fails see if you can download a users manual from Jadis. The other sources are probably commercial and would want a fee. Joe (Trelja might pop bback in to help you also. If not spontaneous start a new post.
fraldrete
4 posts
 
Thanks Doctor,
The fuse cover does not have any information and the fuse itself is very difficult to read, I've tried Jadis and their US distributor with no success and my last hope is Joe who has been the "fountain of all knowledge" in terms of audio for me, a great guy
trelja
3,215 posts
 
My apologies for the late reply, just arrived back from our summer vacation.

My JOR uses a 4A/250V fast blow fuse. Personally, I feel a slow blow fuse is always the better way to go in this application.

Doctor, can you let me know your e-mail address, please?
mechans
2,999 posts
 
Sure Joe, you know what I have a rarely used one that I don't need to protect so carefully, I will tell you here try stmechanic1@comcast.net I can only access it occasionally so forgive me for a slight delay. Once there I will update you on my current addy. Thanks for asking it has been a while my old friend!
fraldrete
4 posts
 
Thank you all for taking the time to help me. My JOR is up and running sounding, really sweet with Chinese EL34s and Teles 12AX7 ribbed plates.
More to discover