[Heathkit] RE: SB-200

[WA3GIN in Alex. City, VA]

...and also remember that double the power is 3db. So, the difference
between 500 watts and 1,000 watts is hardly worth the energy to product the
extra 3 db.  With AGC, DSP, DNL, BC, one probably can't hear the difference,
let alone see it on a segmented "S" meter display or on an old analog meter.
I'd spare the tube, reduce the electrical bill, run 500 watts and use the
saved money to purchase a beam antenna with 10 db gain.  That 10 db is
noticeable and the power company can't charge you for it, HAHA.

73,
dave
wa3gin


-----Original Message-----
From: heathkit-bounces at mailman.qth.net
[mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
Sent: Wednesday, July 26, 2006 5:54 PM
To: Heathkit at mailman.qth.net
Subject: Re: [Heathkit] RE: SB-200

On 26 Jul 2006 at 18:34, Cam and Juli Hedrick wrote:

> I have an SB-230 that I reworked into a SB-200 style.  My output is
> 620 watts keyed down.  Amprex 572B tubes in it and are great
> tubes....20 years old, but only 2 years use.  Meter 2500VDC and .520
> ma, hmmm, a nice amplifier saved.

OK. Thanks for the data. If we assume that your meter readings are 
absolutely correct (foolish assumption, but good enough for this 
discussion), i.e. we ignore meter and visual errors, then you are 
running it at 1300 watts input. 

At 620 watts output, that is 47% efficiency, which is right in the ball-park

for these types of amps.

As I said, 800 to 900 watts output with the rig as designed by Heathkit 
is pretty difficult for me to accept.

They are a darned good little amp, but they aren't SuperMan either, and 
don't/can't violate the laws of physics.

Ken W7EKB
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