THis is a solution http://www.cqham.ru/HiFi_Contester_EX8A.htm
Hsu
-----原始邮件-----
From: Mike Lord
Sent: Thursday, February 21, 2013 4:18 AM
To: amps@contesting.com
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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