Ask him for a photo of the "80-10M" tank circuit.....
"Plate Load Z of 2"
And a matching IQ
----- Original Message -----
From: "Tom Osborne" <w7why@frontier.com>
To: <amps@contesting.com>
Sent: Thursday, February 16, 2012 12:29 PM
Subject: Re: [Amps] 3-500 to 4-250 tube conversion
>6 3-500's??
>
> What the heck band is this made for? 73
>
> Tom W7WHY
>
>
>> 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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