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Old 19th November 2008, 03:23 AM   #51
cbdb is offline cbdb  Canada
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And some of those old tubes might like to stay on all the time?
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Old 19th November 2008, 03:35 AM   #52
anatech is offline anatech  Canada
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Hi cbdb,
Quote:
And some of those old tubes might like to stay on all the time?
Actually, no. Only a few items were designed to run all the time. PA systems (that's why they are class B), computers (those tubes are designed to be kept in reverse bias) and some military or industrial things (like radars, telephone amplifiers - repeaters, etc..). Anything that was left on all the time had a maintenance schedule, even factory PA systems and early Terryphone systems.

If you leave tubes on with full heaters and no B+, you can "poison" the cathodes. The emission drops and noise increases. You are way further ahead to simply turn the item off (entertainment sound equipment).

These days, solid state equipment has lower maintenance if it has to be left on at all times, but there is still a maintenance program to look after that stuff. That is if the factory or installation actually expects their equipment to work when needed.

-Chris
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Old 19th November 2008, 09:50 AM   #53
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Quote:
Originally posted by anatech

Some amplifiers have poor control over the bias current. These take a long time to settle into the normal operating range. This is a defect in design actually. It is perfectly possible to design amplifiers that have settled in within 1/2 hour. Heck, that is the time needed for very accurate measuring instruments to stabilize. If an amp hasn't stabilized within half an hour, it will never settle in.

-Chris [/B]
Ok, if its not temperature dependent, what (more specific) exactly happens this 1/2 hour before we can lean back and listen to our favorite records under full control?
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