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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Against leaving tube units ON

I am one who would advise against the "always on" practice for tube gear, but I endorse it for solid state. If you can manage to wire up your tube gear such that the filament voltage is supplied at least 30 seconds ahead of B+, then there is no significant shock to the tube when you start it up from cold, and tube life is extended compared to the "always on" mode. For power tubes, of course, you want a longer interval of time between the application of filament voltage followed by B+ voltage. Preferably a power tube should feel warm to the touch before you apply B+.

Apart from wearing out the tubes if they are always working, there is also the lesser danger of losing bias because of component failure in the circuit, which can in turn lead to rapid destruction of valuable tubes. Something that would not happen if you are always in the room when the equipment is powered up.


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