I was thinking 100 watts carrier/400 watts PEP AM, actually.
That would allow me to use the Flex 5000A at roughly the same output
level as my old Johnson Viking Valiant.
I'm not a "10 minute club" member, but have occasionally been known to
go 2 minutes keydown on juicy topics. Assuming 2 minutes 'on' and 5
minutes standby in a round table it doesn't sound like I'd be stressing
the PS or tube all that much, although I'm a bit suspicious of the
cooling from that single 5 1/4" muffin fan.
FWIW, when the SB1000 was last in regular use I loaded it to around 800
watts out and only drove it as hard on SSB as it took to get that. (as
measured by a peak-reading meter) That seemed to work at the time.
BTW: I recently tried using one of the PA77's to get that same 100/400
output on 75M and found that it was too difficult to get my 25/100 watt
rigs trimmed down far enough. The 3KA has less gain so is probably a
better candidate, but I haven't tried it yet.
Good info all, thanks.
73, Jim N7CXI
Bill, W6WRT wrote:
> ORIGINAL MESSAGE:
>
> On Mon, 30 Nov 2009 11:54:20 -0800, Jim Barber <audioguy@charter.net> wrote:
>
>> Then that begs the question - Marketing claims aside, what would be an
>> appropriate max output power to run with a SB1000/AL80 ?
>>
>> It's a timely question for me, at least. I have a nice SB1000 that's
>> been in the storage room for 5 years or so and was thinking about
>> getting it out and putting a tube in it. It has 160m, which my 3KA and
>> PA77's have not. It also doesn't cause gale force winds in the shack... ;-)
>
> REPLY:
>
> I have an SB-1000 which I ran on HF for several years and then converted to
> six
> meters. It will give 1 kW out on CW or SSB but should be limited to about 600
> watts on RTTY or FM. The limiting factor for RTTY or FM is the power
> transformer. You could run it for brief bursts (chasing DX) but for extended
> periods such as RTTY contesting at 1 kW the transformer will overheat.
>
> 73, Bill W6WRT
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