[Amps] Bill Orr comment

[Bill Fuqua]

Many of the old spec sheets indicate a correction for plate tank losses.
Also, when figuring class AB2 efficiency don't forget the feed-thru power for
grounded grid amplifiers.

My 4-1000A amplifier when heavily driven will do almost 2.5 times spec. 
plate dissipation into a dummy load.
But it is a grounded grid amplifier and I don't EIMAC ever actually 
specified Grounded data for these
tubes. But, Bill Orr did list some information of his own in the "Radio 
Handbook".

73
Bill wa4lav


At 01:10 PM 7/23/2008 -0400, Peter Voelpel wrote:
>2-2.5 times the dissipation is normal.
>Assume 1500 out, at 70% efficiency that is 643W dissipation, 1500/643=2.33.
>Eimac claims 75% efficiency on their 3CX3000A7 datasheet in AB2.
>
>73
>Peter
>
>-----Original Message-----
>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
>Behalf Of Gudguyham at aol.com
>Sent: Mittwoch, 23. Juli 2008 18:30
>To: amps at contesting.com
>Subject: [Amps] Bill Orr comment
>
>I was reading the Bill Orr handbook and on his section about amplifiers he
>says.....A properly designed grounded grid amplifier should produce 2 to 2.5
>times the plate dissapation of the tube  in output.  He did not put  any
>limitations on the statement as to IMD or anything like that.  He did  not
>say if the tubes ratings would be surpassed (I am sure they would), but I
>think what he was saying is that the tube should continue to make power to 2
>to  2.5 times it's dissapation before it would not make any more power and
>flatten  out.
>
>Upon speaking with an amp "Guru" about this subject, he procalimed that
>Bill Orr was a "QUACK".  The basis of his claim was that he was never able
>to build an amplifier that obtained that kind of results.
>What say you?  Lou W1QJ
>
>
>
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