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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: What's it like at 16 ohms? posted by Lew on July 8, 2008 at 07:11:17:
About 10 of the 60 watts are Class A and the 3rd harmonic distortion is at .6546% with the 5th at .188%.
I'm running 4 6as7gs (that's 8 triodes or 4 pairs) at 148 volts, 70ma. into 325 ohms. (I have a real good, low step up impedance, output transformer) I get 28.7 watts all Class A. Distortion is .0074% and .0003%
If a person had a pair of Paul's Zero autoformers set to 4 times and a 16 ohms speaker he would have a 64 ohm load. With 8 6as7gs he would get 40 watts, all Class A, at .0276% 3rd and .0018% 5th.
It's all about load lines. The higher the load impedance (to a point) the lower the distortion.
Tre'
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Follow Ups
- RE: What's it like at 16 ohms? - Tre' 08:38:47 07/08/08 (16)
- That's a great insight into circlotron performance - Lew 11:02:01 07/08/08 (15)
- RE: That's a great insight into circlotron performance - Tre' 15:26:47 07/08/08 (14)
- RE: That's a great insight into circlotron performance - Lew 19:11:25 07/08/08 (13)
- RE: That's a great insight into circlotron performance - Tre' 20:42:41 07/08/08 (12)
- Put me in the picture then .....without a punch - Satelliteman 23:26:27 07/08/08 (11)
- RE: Put me in the picture then .....without a punch - Lew 06:55:30 07/09/08 (10)
- Lew did you ever do anything with the 1K B+ feedbacK - tubevibb 08:41:31 07/09/08 (9)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Lew 10:15:07 07/09/08 (8)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - tubevibb 11:57:01 07/09/08 (7)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Lew 13:03:21 07/09/08 (6)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Satelliteman 23:17:17 07/09/08 (3)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Tre' 23:55:56 07/09/08 (2)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Satelliteman 02:30:29 07/10/08 (1)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Zero Cool 21:54:42 08/31/08 (0)
- RE: Lew did you ever do anything with the 1K B+ feedbacK - Tre' 15:33:58 07/09/08 (1)
- Put a 5ohm 5w One on each cathode, yes better bass - tubevibb 14:25:27 07/10/08 (0)
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