SB-221 Output measured at 115

[Tom elmore]

 First of all I would like to thank everyone that replied to my question
about my SB-221 output.
I decided to do some serious testing and here are the results. I used my
KWM-2 which puts out 100
watts on all bands as the signal source and measured the output with a Bird
wattmeter and terminated the amp with a Bird dummy load. Also I should
mention that I only used 115 on the primaries and from what I learned I
would be better off running 220/240 with a dedicated circuit.
Also I am trusting that the front panel meters which are 20+ some years old
are displaying the correct voltage and current. The most I was able to get
for RF output was around 500 watts on some bands and a few times I tripped
the breaker.


80 Meters 3.7 Mhz
Amp in CW/Tune     Ep     Ip     Line      RF Output
                   2000   0      114       0
                   1850  .290    112       250
                   1600  .490    110       400
Amp in SSB         2700   0      114       0
                   2500  .310    111       250
                   2300  .500    108       400

40 Meters 7.1 Mhz

Amp in CW/Tune     Ep     Ip     Line      RF Output
                   2000   0      114       0
                   1900  .220    111       250
                   1700  .440    110       450
Amp in SSB         2700   0      114       0
                   2600  .310    112       250
                   2350  .500    109.5     500

20 Meters 14.0 Mhz
Amp in CW/Tune     Ep     Ip     Line      RF Output
                   2000   0      114       0
                   1900  .240    113       250
                   1700  .500    110       500
Amp in SSB         2700   0      114       0
                   2600  .300    112.5     250
                   2400  .420    110.0     500


15 meters 21.0 Mhz
Amp in CW/Tune     Ep     Ip     Line      RF Output
                   2000   0      114       0
                   1850  .290    112.5     250
                   1700  .460    111       350
Amp in SSB         2700   0      114       0
                   2500  .310    111       250
                   2350  .500    110       450


Thank You
Thomas Elmore
Barrow,Alaska

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