[Heathkit] SB220 Problem

[manualman at juno.com]

It probably would be more helpful if you took three readings per band
(low end, middle, upper end). It could give an indication of how the
input tuning coils of the SB-220 are set and whether they might need
adjustment.

Pete, wa2cwa

On Mon, 13 Mar 2017 21:34:57 +0000 Marty Bluhm <w8aks55 at gmail.com>
writes:
> Good afternoon,
> You may remember I had a problem with my SB220 not loading into the 
> antenna
> (dipole) on 40m.
> I am driving it with a ic7300. Tuning into the amp would be flat but 
> when I
> keyed the amp, the swr reading on the 7300 would spike.
> At the time, I didnt have a dummy load for a 1.5kw , I purchased one 
> but
> health issues reared its ugly head and I am just getting back to
> troubleshooting. So please  bear with me.
> I ran the SB220 into a 1.5 kw dummy load with 60w cw from the 7300.
> This is my readings:
> Band             Plate Amp                Grid            Rel Pwr
> 80                    .7                          200                
> 140
> 40                    .4                           50                
>    20
> 20                   .5                          250                 
> 240
> 15                  .4                           130                 
> 240
> 10                    .5                         220                 
>  160
> 
> There is obviously something in the 40m circuit.
> Any suggestions on where to start looking
> Also Availability of parts, such a coils, etc.
> 
> Appreciated all the previous help and double that now.
> Thanks & 73
> Marty
> W8AKS