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In the Forum: Melquiades Amplifier
In the Thread: The 6E5P tube data.
Post Subject: Full power aheadPosted by hagtech on: 2/21/2008
I chose the 170V point as midway between the 250V supply I had for the CCS plate load. The choice was for maximal signal swing in both directions.
| in a properly designed amplifier a transformer should clip before the active stages |
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Then I did it wrong. I have it so the DHT clips into A2. Since operation is PP, it is full class A up to 6W, then switches to class B as on tube cuts off (determined by reflected load line). I have this set just where A2 starts on the active tube. Thus, power is sort of cut in half as it clips. None of the transformers saturate. The output tranny is a humble Hammond 1615. Current in each primary is perfectly balanced by identical CCS for each tube. So tranny has a ton of headroom. No dc on it.
| The 25.5kHz as full power is not just very good but exceptional |
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Usually I get a lot more. My "Cymbal" amp using 6H30 output tubes cranked out 95kHz.
I did bandwidth measurements at 1W. I doubt it falls off to much at high power at HF. Probably moreso at LF. A 5kHz full power sinewave showed no signs of pain. It is a good idea to check, though. I should plot both 1W and 6W bandwidth responses.
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