So, having been interested in previous discussions of tube rolling with the BHSE which comes up here on a regular basis and dating back to early posts by Elephas, I decided to swap my SED EL34's for an older "matched" quad of Shuguang 50 year Treasure 6CA7's that I possess that have about 300 hours of use. I did not expect to hear a difference but there is a difference. The treasures are more dynamic, "tube-like" if you will allow, and very revealing. I really like them, but I have questions that I hope someone will answer for me.
First is that the Treasures run noticeably hotter. I never thought of my BHSE as being a space heater until I installed these tubes. Are they drawing more current? The box reports what I assume is plate current at 40mAmps. This is a few milliamps higher than the EL34's I was using - does that account for the difference in heat and perceived performance? And is it safe? Have others here that have done this found this to be true?
Admittedly ignorant, please explain.
I know next to nothing, but did you adjust the bias?