[Heathkit] SB220 Problem

[Marty Bluhm]

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