I had a 3 x 813 amp for a few years on 75 meters. Never had a problem with
it. Ran 800 watts out with 2500 volts on plate. Was unbreakable. Used a
muffin fan for cooling.
Worked 135 countries on 75. "Upgraded" to an amp that has final tubes that
cost over $500. Output power almost doubled and almost no one can tell the
difference (3 db).
Now, I have to wait 3 minutes for the filaments to come on.
73, Colin K7FM
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