I run a pair of 813's grid driven (grounded cathode). Plate voltage
is about 2200V. I can get around 700W PEP on 15M and a little less on
10M. Because of the high output cap you need and L-PI. They run
around 60% efficient.
- Paul KW7Y
At 12:18 PM 2/20/2013, you wrote:
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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