That was done in the bigger commercial rigs back into the 30's.
Carl
KM1H
----- Original Message -----
From: "ZL2AAA" <zl2aaa@paradise.net.nz>
To: "Mike Lord" <k4elv@bellsouth.net>; <amps@contesting.com>
Sent: Friday, February 22, 2013 3:17 PM
Subject: Re: [Amps] 813 efficiency
From memory a GE Ham paper had this info and I think the answer was to tap
the tuning cap along the 10m tank coil.Morrie
----- Original Message -----
From: "Mike Lord" <k4elv@bellsouth.net>
To: <amps@contesting.com>
Sent: Thursday, February 21, 2013 9:18 AM
Subject: [Amps] 813 efficiency
Some time ago (maybe 2 years) there were comments filed on this site
regarding increasing the efficiency of the 813 tube on 21 - 28 mhz. I've
looked through my history of this group but failed to find a reference.
I also checked some GE Ham News articles that I've saved. I realize the
tube wasn't designed for this spectrum. However, I do seem to recall
some references being made on this site based upon personal experiences.
I really don't intend to waste the groups time, but I sure would
appreciate any circuit suggestions that would lead to increased
efficiency of this tube.
73, Mike K4ELV
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