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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Tube/Valve Lifespan posted by immatthewj on December 10, 2020 at 20:42:00:
It really depends upon the tube -
and in truth it is not just the bias - but the power you are pushing into the tube to get the amplified music out-
Tubes have design specs - and generally they should be adhered to
There are designers who have pushed the ratings and get long life, there are others who push the envelope and get short tube life-
The Tube specs are not always easy to decipher-
From the RCA RC-30 Tube Manual- for the 6CA7 - Class A, Plate voltage, 800v, bias current 150mA
but in the next section, Class AB1 - Plate voltage 450, with a 'zero-signal plate current' of 120mA - which is the bias current w/o signal- or idle current...
So in a PP Amp using this tube - running a bias current above the 120mA would be 'hot' at a plate voltage of 450
But class AB1 is a bit of a sliding scale - and the place on the scale is determined by the bias current....
As with a sailboat, the design is a compromise.
For a sail boat, the line goes: Speed, Comfort, Sea-worthyness - pick two!
Happy Listening
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Follow Ups
- RE: Tube/Valve Lifespan - 6bq5 21:05:15 12/10/20 (1)
- RE: Tube/Valve Lifespan - immatthewj 21:35:15 12/10/20 (0)
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