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In Reply to: keep going...sooner or later, you'll get it. posted by Sector-7G on December 1, 2004 at 07:50:10:
Doug wrote:::::from MSL:Now, if you would be kind enough to show me where (in his text) Norman states explicitly (please quote him directly) that the load seen by each tube is raa/2 I would be most appreciative.::::
:::read the second paragraph,::::
on which page and in which coloumn... or better yet quote the text you are referring to. Show me in Norm's words where he sez that the loadline seen by each tube is raa/2.
:::...and measure the slope of the dashed line he refers to. a few folks have done just that. I will leave the execise to the student. What is the slope of that line?::::the slope of the line in degrees? That's all you can measure directly... is what is the slope of the line referenced to the horizontal axis in degrees....
otherwise... you need to account for the voltages and currents as prescribed by the author and whose text re: these parameters I have already quoted. But you cannot read voltage divided by current directly off of these curves without introducing errors.
you need to go through Norman Crowhursts' examples step by step... and when you encounter something different than what he sez... figure that your probably making an error of some kind. Prudence might suggest that Crowhurst (author of 600 plus books and articles) probably had proof read and was satisfied with his work before publishing it.
Funny... how you guys cannot provide one published example of a PP loadline having raa/2 as it's effective or operating impedance for each half primary.
On the other hand, I have provided mutlitple published sources which state explicitly that each tube in a class A PP amp will see raa/4 as it's reflected load impedance.
If brains bigger and better and smarter than my own cannot satisfy you then I doubt that I will be able to explain it any better than say Steve Bench, Broskie, Crowhurst, RCA engineers, etc, et al.I'll just wait for the Dougie text on electronics to be published.
msl
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Follow Ups
- Re: keep going...sooner or later, you'll get it. - mqracing 12/1/0408:50:24 12/1/04 (15)
- References... - Damir _ the real one 10:51:27 12/1/04 (1)
- Here is an old published example - Russ57 10:03:15 12/1/04 (5)
- Re: Here is an old published example - mqracing 12:36:02 12/1/04 (4)
- Re: Here is an old published example - Dave Cigna 14:12:10 12/2/04 (1)
- or... - Sector-7G 14:58:52 12/2/04 (0)
- Well, you did ask for a published reference:) - Russ57 10:23:13 12/2/04 (0)
- well, I'll just add him to the list... - Sector-7G 12:47:45 12/1/04 (0)
- since you want it out in the open... - Sector-7G 09:33:05 12/1/04 (0)
- maybe you won't get it.... - Sector-7G 09:21:25 12/1/04 (6)
- or, if you find Crowhurst too confusing or complex.... - mqracing 10:54:03 12/1/04 (3)
- you can't even compute a load line value from its slope... - Sector-7G 11:00:41 12/1/04 (2)
- go for it Dougie.... - mqracing 12:21:41 12/1/04 (1)
- thank you Mike... - Sector-7G 06:17:03 12/2/04 (0)
- keep reading dougie.... - mqracing 10:52:00 12/1/04 (1)
- why? - Sector-7G 09:11:51 12/2/04 (0)
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