In this case that is near correct. There is some feed through power also
present.
But the limiting factor is not always one half total plate dissipation.
If the tubes were run in class A rather than B then output would be
limited to much less than half the plate dissipation. At 33% efficiency
in class A at full PEP the efficiency for the carrier would be 16.5%.
Carrier power would then be limited to 41.25 watts plus a little feed
through power. That's with an input of 250 watts.
73
Gary K4FMX
Mike Dorworth,K4XM wrote:
Actually, only one half of plate dissipation. The ICAS dissipation for a
single 813 is 125 watts, CCS is 100 watts.. This is the maximum carrier for
reasonable tube life. Efficiency is low without modulation., increases
during modulation. Limiting factor is one half total dissipation.Sorry but
the facts are so. Mike
----- Original Message -----
From: "W5OMR/Geoff" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" <amradio@mailman.qth.net>
Sent: Thursday, September 29, 2005 6:03 AM
Subject: Re: [AMRadio] GG 813 Linear in GE Ham News
Gary Schafer wrote:
A pair of 813s in GG are only good for 150 watts carrier out on AM.
73
Gary K4FMX
I'm not trying to start anything here, Gary, but that statement seems to
be in stark contrast to what you said, yesterday...
With an AM linear the efficiency at carrier must be / will be exactly
one half what it is at PEP. Provided it is tuned properly.
73
Gary K4FMX
What would the efficiency be of an AM Linear at carrier.
(or maybe I'm not reading this correctly, because I've yet to have
coffee this morning, and I -know- I probably should'n't be posting
messages in this state... ;-))
--
73 = Best Regards,
-Geoff/W5OMR
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