> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Ian White GM3SEK
> Sent: Friday, March 03, 2006 2:30 AM
> To: amps@contesting.com
> Subject: Re: [Amps] HB amps
>
> 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
A pair of 813's will easily produce 600 watts output and do it for years and
years. They are very rugged tubes. I have an amp with a pair of them that I
built in the mid 60's and it still has the same pair of tubes. At one time I
ran them with over 3000 volts on the plates for several years with the
plates regularly showing color and power out well above 600 watts.
The same tubes now run at around 2500 volts and still put out 600 watts and
no color.
Not the best tube in the world but for the price and as rugged as they are
they are hard to beat.
They will perform well on a wide range of voltages too. 2000 to 3000 volts.
73
Gary K4FMX
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