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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: Output impedance as moving target posted by Kevin Covi on October 3, 2000 at 11:19:59:
Although closer to the truth we still seem to have some problems with this analysis.First, the actual max output power is at 14-16 ohms (kind of a flat peak) and
Second, the actual measured output impedance is still under 4 ohms.
So the formula is either wrong or the values in it are.
I beleive that the Rp, like the mu, is not fixed but is somewhat variable. If you make a small change in Rp, like 240 instead of 280, you start to see what I mean. If mu can be 2.5 instead of 2, the results are much closer to reality.
I think that this is part of the issue that never gets serious discussion but should. Fotunately for us, tubes are not static devices.
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Follow Ups
- Re: Output impedance as moving target - Ralph 17:04:22 10/09/00 (0)
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