Tube amp powered up?


I'm in the habit of leaving all my SS components powered up all the time, as advised by the first dealer I knew, back in the 80s. Now, I have a tube integrated (jolida 302b,and a vintage tube receiver. Some say leave the tubes on all the time, because what hurts them is the surge when they're turned on. Makes sense to me, but all the dealers, gurus, soothsayers and technicians advise bringing the tubes down when not listening. Anybody have an opinion?
FF
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Showing 1 response by atmasphere

Its not the turn-on surge that messes with tubes, its something called 'cathode stripping' but it only happens in any significant way to power tubes, and that occurs when B+ (voltage) is applied before the tube is completely warmed up. The Jolida has a 'soft start' system for this reason- essentially a timer that waits until the tubes are warmed and then applies B+.

We do it the old school way, just like many guitar amps, where there is a Standby switch so you can apply the B+ (or shut it off) when needed.

Generally speaking, you don't leave tube gear on 24/7 as tubes do have a lifespan, most of which will likely be used up when you are not even around. Some tubes are really expensive, and unlike solid state which can take a day or even a week to sound right, tube gear generally will be sounding pretty good in about 15 minutes and sounding their best within 2 hours. So even though tubes take longer to warm up compared to transistors, they actually don't take as long to warm upĀ  compared to transistors :)