@dekay, interesting question about glass thickness and heat. I’m also curious about this. I never really thought about that,until this thread popped up.
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- 14 posts total
- 14 posts total
@dekay, interesting question about glass thickness and heat. I’m also curious about this. I never really thought about that,until this thread popped up. |
Just checked my Psvane CV181 tubes in front positions (warm) and TJ Full Music 6SN7s (slightly warmer) in rear positions in my Cary SLP-98 preamp. Can hold my fingers on both, neither are "hot" or burn fingers. Put my tongue on them, no issue there either - just kidding, yak yak 🤪. Power transformer is separate/external on mine, and not heating up the whole preamp top plate surface area either. It's going to vary by design with each preamp, transformer locations, and casing, venting too. |
OP, others, Do you have your own simple tube testers? I cannot imagine owning tube equipment without one. simple, seller seems to know what he is talking about
another
I have this one
they make a slightly larger model 257, still very portable there are a lot of good ones listed now
people say: " this little one agrees with my other testers". that's always been true for mine as well. I've got a big calibrated one around here somewhere, they always agree, I don't bother with it any more. |
As a general rule, preamp tubes don’t run anywhere as hot as amplifier output tubes and that’s one big reason they can last 2000-10000 hours. I’m currently running a couple of Amperex 6922 and while I wouldn’t want to be holding one, they’re not so hot as to Immediately blister my fingers. All the best. JD |