Hi Sir Tony,
Does your comment below applies to tubes used in pre-amps or amps or just for rectifiers?
Mine is a loaded question depending on the answer can go different directions; I plan to build an VTA ST 120 in the spring and a little understanding in tube selection will help and for additional knowledge.
Also I came back to your comment as I did my first tube rolling 2 weeks ago, I replaced the 12AX7 EH with Mullards on my pre-amp, but did not hear any significant change which led me to ask the question.
Thanks.
the tube business is indeed a funny business,
GE buys tubes from RCA with the GE logo and vice versa...
Mullard ask Toshiba to make tubes for them, etc, etc,
having a tube that works well is good enough,
remember that cathodes of tubes gets depleted in use,
so that when transconductance is almost gone, you will see a lot of manifestations.....
so i look at tubes, not by who made them, but how much life is inside of them...