[Amps] SB-220 Drive Levels -FTFM

[N7KA at comcast.net]

The manual on page 72 states .5 Amps, 2000V, and Ig of 100-200mA. This is with the SSB/CW switch is in the CW position (lower plate voltage) resulting in 1000W INPUT, the legal limit at the time the SB-220 was introduced.  The manual goes on to give tuning instructions for SSB when amp is placed in SSB position.

I have used the SB-220 but almost always in SSB position for SSB or CW.  1200W out is about maximum I had read on the BIRD wattmeter on CW, but do not do a long key down.  And I never used it on RTTY.

Arne N7KA 

-------------- Original message -------------- 
From: Lee Buller <k0wa at swbell.net> 

> 
> 
> If I remember correctly, the manual says drive it to 500 ma. That is it. I've 
> seen guys drive it to 600 ma in SSB mode (higher plate voltage). As everyone 
> said here....it really was not designed to be what you want it to be a 1.5 KW 
> amp. 
> 
> Now, here is a comment that I think will draw some ire from people....I never 
> liked the amp because of one factor....it seemed to generate a lot of TVI. Why? 
> Dunno. To many factors....poor TV, poort cable TV, etc....but once I got a 
> different amp...all that seemed to quit. 
> 
> Lee - K0WA 
> 
> 
> In our day and age it seems that Common Sense is in short supply. If you don't 
> have any Common Sense - get some Common Sense and use it. If you can't find any 
> Common Sense, ask for help from somebody who has some Common Sense. Is Common 
> Sense divine? 
> 
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