The SB-220 has been run by many at 1200W out on CW in the SSB position
since the first one was shipped.
That holds true with most other 2000W PEP Input amps.
Carl
KM1H
----- Original Message -----
From: "Robert Morris" <robrk@nidhog.net>
To: <gzook@yahoo.com>
Cc: <amps@contesting.com>
Sent: Thursday, January 22, 2009 7:01 PM
Subject: Re: [Amps] SB-220 Drive Levels
> Glen Zook wrote:
>> You are thinking of the SB-200 and not the SB-220. The SB-200 (pair
>> of 572B tubes) was rated at 1200 watts PEP input and they generally
>> get about 600 to 650 watts output. The SB-220 (pair of 3-500Z tubes)
>> was designed for 2000 watts PEP input and about 1000 watts output.
>> It generally takes at least 100 watts drive, and often a little bit
>> more, to get 1000 watts output. Getting 1000 watts output is
>> definitely easier when running the SB-220 from 240 VAC and not 120
>> VAC. Now you are not going to get 1500 watts out of a "stock"
>> SB-220. But, 1000 watts is doable and will not overload the
>> pi-network, etc.
>>
>> Glen, K9STH
>>
>> Website: http://k9sth.com
>>
>>
>> --- On Thu, 1/22/09, Robert Morris <robrk@nidhog.net> wrote:
>>
>> The SB220 was never designed to "make" 1500 watts. It was designed
>> for 1000 watts INPUT (plate volts x plate current). At 60%
>> efficiency, look for 600 out.
>>
>> Just because it has 3-500's, the tank coil and power supply were
>> never meant for more than 600 out.
>>
>>
>>
>>
>>
> No I'm not thinking of the SB200. I was trying to answer the original
> question.
>
> When incomplete questions are asked, we fill in with assumptions.
>
> The question was getting 1500 watts out of an SB220. Answer: you
> don't, for very
> long.
>
> He did not mention PEP.
>
> Most tune up and meter reading is done with CW.
>
> Tune your '220 to 2500 watts input and let us know how it works.
>
>
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