Jadis OR bias value for Mullard RL34 and KT88 help

Trelja.... I'm back again. Heart attack slowed me down a little, but feeling a lot better now.

I ordered the JJ el34 L tubes and should have them in a couple of days.

Indeed I was going to tell you what Joe did. The JJ E34L is a different tube, I think IIRC that the height is slightly longer than the regular JJ EL-34. The other cool thing is that the E34L comes in colors. Trelja and I preferred the Blue glass. I am not sure but I think the color helped with heat dissipation.
Unlike Trelja I never noticed the loss of bass or low end extension relative to other EL-34s. It possibly true and Joe is rarely wrong about all things audio. I haven't had the matched octets necesarry to make such a comparison in a long time.
I am just wondering outloud, if you might want to try the Gold Lion Reissue KT-77 at some point. When I get my equipment back, I was thinking about putting the KT-77s in my DA-60. I will report my findings should I endevor to make the switch, but my amp is not a JOR, so it may not be very useful to you.
I have never rebiased the amp because it has an autobias circuit built in, and I am uncertain if I can overide the autobias, and bias the amp manually. It would be a PITA in any event the amp is pretty heavy and I am not young anymore.

Hello Doctor. I did order the blue ones.
I also rearranged my listening environment to an area that has no hardwood reflection. The one thing that I feel is lacking is the sensation of being in a totally black void and just having the music suddenly just be there. KT88's did that for me. I am trying to recreate the same environment for the el34s.
I may try the KT77 tubes down the road, but I want to concentrate on the 88 and 34 shootout for the time being.
After I get the speakers aligned and the foam absortion set up, I think I will be in a better position to judge.

Great discussion, I am really enjoying. I always wanted a Jadis Orchestra to try out, but I already have four tube amps, maybe down the line a bit...

Heart attack, Mattzack2?!? WOW, that's serious in the kind of way we almost never get around here. Terrible news, I'm very sorry. I'm amazed how quickly you've gotten back into the game.

I've been in contact with JJ through the past year, and they maintain the blue and red glass have no influence on sonics. Years ago, a person (not at JJ) told me that to the degree the color (red, blue, clear) effect heat dissipation, sonics will follow. For whatever reason, the red tubes don't get imported by those who bring them in, as the blue was what folks went with in this market.

The Doctor and I participated in a JJ E34L vs JJ KT77 vs JJ KT88 shootout in the Jadis DA60 several years back, and drew some pretty stark conclusions from that. I'm not the fan of the JJ KT77 that most are. I've not heard the Gold Lion KT77, but hear good things about them. In the past year, I've purchased JJ EL34 and big bottle 6CA7 tubes. The EL34 have a more even-handed, fuller, richer sound top to bottom than the E34L, filling in that lower end. But, the E34L maintain that glorious midrange. As I just got the 6CA7 two weeks ago, and have been playing with other things of late, I've not yet tried them.

Doctor, the DA30 and DA60 are autobias (cathode bias) as you mentioned. In other words, the bias gets set by a "fixed" resistor connected to the cathode of the output tube, and cannot be adjusted without changing that resistor. The JOR is fixed bias, which means bias is set through a resistor connected to the control grid of the output tube. The term fixed bias is counter-intuitive, as it most often means that resistor is adjustable (potentiometer). A fixed bias amplifier can also employ a fixed resistor inline with the control grid of the output tube, which would not be adjustable without changing that resistor. Beyond having to manually adjust bias or not, cathode and fixed bias differ in their output power and sonic characteristics.