They are not required in some preamps at all because each tube has aspecific role in in an active gain stage that drives both cjannels this is absoluteley certain for my legendary ARC SP6B. It is not going to be true in cases where each tube is in a circuit that drives a differet channel unlesss they give you explicit instruction in adjusting the voltage to each tube to get te same gain in a multi channel multiple tube preamp. I doubt that you will be able to do it so. I would get well matched tubes. If there is only one gain stage for all 6 channels do what you like but don't use the wrong tube type.
How Important is Tube Matching?
I was wondering how important tube matching is for a preamplifier. I had read somewhere that tube matching is extremely important if the tubes were used in an amplifier but was less critical for the preamp. Is this true? I've recently acquired a tube preamp and want to upgrade the tubes but wasn't sure it was worthwhile to pay the big dollars to get matched set(s)...It's a six channel preamp! Any advice would be appreciated.
Thank you!
calgarian5355
Thank you!
calgarian5355