SB-104A problem

[R. Schmitz]

Hello Heathkit-Owners!
Got a used SB104A and made some repairs.
Rig is fine now in RX all bands.
But TX there is a problem: Full output (SSB/CW with or without Filter) on
80,40,10 m.
Only abt 40Watt on 20 and 15m.
Driver (Power switch to LO) also only half Power on 20 and 15m.

Have only one Manual,believe there were original two?
Mine is that,with all the circuits to fold out.Miss also the Extender Board. 
So repairing is a bit difficult,but hope You pass some good ideas to me.

 Power is increasing from abt 20W to 40W, if i key down a while.
So , i think, the problem could come from a switching-diode?
Or could it be in the  Bandpass in the output-line to Antenna connector?

Has anybody Ideas or (maybe) had the same problems??

Wonder why 10m has full output?

Any help is welcome!
Best 73´s de Randolf,DL6KAI

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