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

To: <>
Subject: Re: [Amps] 3-500 to 4-250 tube conversion
From: "Tom Osborne" <>
Reply-to: Tom Osborne <>
Date: Thu, 16 Feb 2012 09:29:53 -0800
List-post: <">>
6 3-500's??

What the heck band is this made for?  73


> 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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