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In Reply to: RE: How about an actual experiment? posted by Tre' on August 26, 2011 at 17:46:24:
Okay, here's everything I know and stated better than I can. John Broskie is right. He wrote that when he also went in and explored the claims. I'll back up John on his essay.But I have an additional comment to John's article. When you use SPICE modeling, it is a small signal condition applied for rp, ip, and vgk calculations. It does large signal harmonic distortion calculations based on 6AS7 triode plate curve modeling, but not for these other parameters as curves for them are not provided in the model.
Therefore, the output impedance calculations are for small signals only and that will operate in the zone of pure class A operation, about a couple watts maximum output. That means that actual output impedance for more signal level than that is significantly higher.
-Kurt
Edits: 08/30/11
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Follow Ups
- "Ask Kurt Strain about this issue." - kurt s 23:43:12 08/29/11 (7)
- Thanks, Kurt... - Lew 13:29:50 08/30/11 (6)
- Paul Speltz did the wrong thing - kurt s 18:10:04 08/30/11 (5)
- RE: Paul Speltz did the wrong thing - Lew 07:08:04 08/31/11 (4)
- Here is Paul Speltz' post on circlotron output Z... - Lew 07:40:22 08/31/11 (3)
- I see that really Paul almost did the wrong thing. - kurt s 20:02:04 08/31/11 (2)
- Output Z of cathode follower... - Lew 20:51:46 09/01/11 (1)
- RE: Output Z of cathode follower... - kurt s 00:42:47 09/02/11 (0)
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