[Heathkit] SB-200

[Kenneth G. Gordon]

On 26 Jul 2006 at 18:22, w8qwl at juno.com wrote:

> A lot of guys lie too!

Or their meters do...or they look at them sideways...or...

In any case, the SB-200 is a darned good little amp. According to the 
manual, it is rated at 1200 watts PEP input for SSB and 1000 watts 
input for CW at 50% duty cycle.

If we assume 50% efficiency, CW power output would be 500 watts, 
and SSB PEP output would be 600 watts (but you would need a peak-
reading watt meter to tell this with any reasonable accuracy).

If we assume 65% efficiency, then those figures are 650 watts and 780 
watts PEP respectively.

However, I don't know of any GG amps that run much more than 50% 
efficiency unless they were running push-pull Class B, and then the 
harmonic output and IMD is reportedly too high to be acceptable. (I 
don't know about this last bit, but so I have been told...)

Now if we add in fed-through power from the driver, at 100 watts drive, 
something less than 50% of that power is fed through. But let us, for the 
sake of argument say that the 50% figure is acceptable.

You can then add 50 watts to the above figures.

In any case, 800 to 900 watts output with all parameters as originally 
set is not really possible, IMHO.

But then again,  what do **I** know? :-)

Ken W7EKB