[Boatanchors] "Sweep Tube" That Can Handle 1 KV on Plate?

[james.liles at comcast.net]

Hi Dave, Bill:

The Hallicrafters SR-400A uses 6KD6 tubes for final's.
Input 500 watts SSB, 350 CW, 275 out PEP, and 175 out CW.

These are not estimates, the radio will do it without killing the tubes. 
Note that they are fan cooled.

It uses 750 volts on the plates.

Kindest regards Jim K9AXN



---------------------- ORIGINAL MESSAGE --------------------------------

Message: 2
Date: Mon, 21 Oct 2013 21:13:19 -0400
From: Bill Cromwell <wrcromwell at gmail.com>
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] "Sweep Tube" That Can Handle 1 KV on Plate?
Message-ID: <5265D12F.3060007 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 10/21/2013 08:54 PM, David Stinson wrote:
> Is there such a thing as a sweep tube that can handle 1000 Volts
> on the plate?   Best if it has 10 to 14 Volt filament, but will work
> with other voltages.
>
> 73 DE Dave AB5S
>
Hi,

I've heard of some people running 1000 volts on the plates of 6KD6
tubes. Those have large envelopes and apparently the spacing to handle
that. They must be running on the ragged edge and might not tolerate
long tuneups. I think they might be fairly expensive but I haven't
looked lately. I remember a project that sucked a quarter kilowatt out
of a pair of them. Maybe that was DC input.

That might be a good way to turn a 'spensive (maybe scarce) tube into
scrap real quick. -krinkle- What are you building, Dave? -zzzzapp-

73,

Bill KU8H