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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: Circlotron and class A posted by Ralph on May 11, 2005 at 14:46:19:
It's a matter of whether or not the current is moving equally up and down. Output tube bank #1 vs. output tube bank #2.
If the current goes up in one bank 600ma. from the starting point of 550ma., which it must for the amplifier to make________(you tell me) watts, the other bank can not go down 600ma. if it started at only 550ma.
In a true Class A amplifier the output stage current draw from the power supply does not change from no signal to full power. (Oh, it changes a little due to non-linearities in the tube, but only for that reason. Not because one bank has stopped going down because it has no where to go.)
If one output tube bank cannot reduce it's current at the same rate as the other output tube bank is increasing it's current, then the current draw on the supply will go up. And this is no longer the type of Class A as seen in a single ended amp or True Class A push pull amplifiers like the designs of Lynn Olsen or the Sun Audio stuff or any number of Class A Push Pull designs out there.
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Follow Ups
- It's not a question of A1 vs. A2 - Tre' 15:57:08 05/11/05 (1)
- Re: It's not a question of A1 vs. A2 - Ralph 19:33:20 05/13/05 (0)
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