Bill Turner wrote:
>ORIGINAL MESSAGE:
>
>At 04:47 PM 3/2/2006, carl s. wrote:
>
>> Am I out of the logic loop when considering a pair of 813's for an amp??
>>I know there are a lot of "fancy, new " tubes out there, but can they
>>compete with the "old stuff" in the 1 KW class , insofar as the price and
>>simplicity is concerned ?? I don't care for contests, etc, but we all know
>>that a little extra power can be a big help, now and then!!!
>> Anyone care to comment ???
>> carl / kz5ca
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>If you take away the nostalgia factor, there are better tubes available, IMO.
>
>For about the price of a pair of 813s you can get a single 3-500z
>with twice the plate dissipation, only one hole to drill and a
>perfect mate for today's 100 watt transceivers if you run it in GG.
An 813 only has 125W dissipation, so by today's standards they are small
tubes. You'd need four to equal a single 3-500Z, which will glow just as
nicely.
A pair would be struggling to reach even the "1kW input class", and the
clean linear output is unlikely to be more than 400W. Even if you have a
box full of 813s, is it worth the effort of building such a small amp?
--
73 from Ian GM3SEK
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