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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: grid current in 6AS7 posted by Lew on May 8, 2006 at 07:01:16:
I just checked my notes, and I get +/-16volt peak into 8ohms, +/-2amps, with a total of 4 tubes, so thats 500mA per section. That's with seriously flat-top clipping.
I took these measurements a few weeks ago and I think I said to myself I can probably get 600mA with positive grid drive, and somehow mixed the numbers. Too many hours in a cloud of solder...
But with 500mA out the tubes have approx 110volts on the anodes which gives a peak dissipation of 55watts! I should probably not push it any further with an addition grid dissipation? I idle the tubes at roughly 65mA and use a 120-125volt supply so the idle dissipation is well within limits.
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Follow Ups
- u're right! - Jalla 13:07:26 05/08/06 (5)
- Re: u're right! - Ralph 14:16:55 05/08/06 (4)
- Re: u're right! - Jalla 00:34:45 05/09/06 (3)
- Re: 16 watts is about right - Ralph 12:32:32 05/09/06 (2)
- Re: 16 watts is about right - Jalla 00:16:49 05/10/06 (1)
- Re: 16 watts is about right - Ralph 07:57:37 05/10/06 (0)
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