On Apr 9, 2006, at 10:17 PM, Will Matney wrote:
> All,
>
> I started reading through the RCA Radiotron Handbook this evening
> looking for where the factor of 1.8 is listed for calculating the
> plate impedance of a class AB amplifier, and I can not find it.
A factor of 1.8 is close enough. The exact factor is dependent on
ZSAC, so there is no magic number written in stone.
> The edition I have was the older one back in the 40's with the black
> cover. The red one was from the 50's and had more in it if I recall,
> but I don't have it. I was wanting to find where it gives this factor,
> and the ones for Class A, AB1, AB2, B, and C. Bill Orrs handbook gives
> the factor of 1.8 on his Pi tank values table, but doesn't mention
> anywhere in the text where it came from. I also looked in a RCA
> receiving tube book and could not find it there either, or I am
> overlooking it somewhere. I could have sworn it was in the Radiotron
> Handbook. The Handbook does say that the plate impedance is twice the
> peak voltage swing times the peak anode current. What I'm wanting to
> know is where are these factors located in print, as I'd like to read
> the whole texts concerning this? Any help
> would be deeply appreciated. Thanks to all in advance.
>
> Best,
>
> Will
>
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>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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