[Amps] SB-220: 1,800 Watts Output

[Carl]

Hams liking to beat tubes hard and enjoying creating splatter 
notwithstanding the SB-1000 should follow Eimac spec for long life.

The tube is rated at 65W drive, round that off to 75W for losses.  Grid 
current should be 125-150ma and plate current 400ma maximum key down. 
Depending upon the key down plate voltage that should result in 700-800W 
out.

While the tube will absorb 100W of drive the stress isnt worth another 200W 
and the reduced IMD on SSB.

I bought a LK-500ZC in 1987 and run it at 1200W out and the original 3-500Z 
tubes still show full power even on 10M even after years of world class 
contesting back thru the mid 90's

Carl
KM1H

----- Original Message ----- 
From: "Jim Barber" <audioguy at charter.net>
Cc: <amps at contesting.com>
Sent: Monday, November 30, 2009 2:54 PM
Subject: Re: [Amps] SB-220: 1,800 Watts Output


> 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... 
> ;-)
>
> Thanks,
> Jim, N7CXI
>
> Carl wrote:
>> I wouldnt want to be on the same band with either one!
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "Vic K2VCO" <vic at rakefet.com>
>> To: <Gudguyham at aol.com>
>> Cc: <amps at contesting.com>
>> Sent: Monday, November 30, 2009 12:30 PM
>> Subject: Re: [Amps] SB-220: 1,800 Watts Output
>>
>>
>>> Gudguyham at aol.com wrote:
>>>> I may be quite possible that the Sb-220 WILL do 1800 watts PEP output
>>>> with
>>>> the special Peter Dahl transformer. A regular SB-220 on 6 meters could
>>>> do
>>>> 1600 PEP with a standard transformer. Check this out
>>>>
>>>> _YouTube - King Conversions SB220 Monoband 6M amplifier 1.5 KW+ -
>>>> QROKing.com_
>>>> (http://www.youtube.com/watch?v=8c_X9C--hmM&feature=related)
>>> Well, my SB-1000 with ONE 3-500z will produce 1100 watts output, if I
>>> forget to turn down
>>> the drive from my exciter.
>>>
>>> The question is "for how long will it do this?" My guess is "not too
>>> long!"
>>> -- 
>>> 73,
>>> Vic, K2VCO
>>> Fresno CA
>>> http://www.qsl.net/k2vco
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>>
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