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[Amps] 3-500 to 4-250 tube conversion

Subject: [Amps] 3-500 to 4-250 tube conversion
From: kennon lewis <>
Date: Wed, 15 Feb 2012 23:58:49 -0800
List-post: <">>
hello. recently I received an amplifier with 6 bad 3-500z tubes in it. i
have a bunch of good 4-250 and 4-400 tubes on hand and am looking to
convert the amp to run on these tubes. the cost of purchasing 6 new 3-500
tubes is out of the question at this time. the amp covers 10 - 80 meters.
looking at the tube data it looks like all i need to do is strap pins 2 and
three together with a low ohm resistor and that should do the job, one
being a triode and the other a tetrode. the power supply seems more than
adequate. any schematic help or other information will be greatly
appreciated. thanks ke5rgm
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