[Amps] QSK-5 Improvements

[Paul Christensen]

I recently acquired a used Ameritron QSK-5 for use with a solid-state amp. 
In preparation for use, I noted that the RCA control jacks were loose.  In 
the event the KEY 2 connector become loose, hot switching will occur since 
the QSK-5 depends on the cabinet for the return ground leads.  Relying on a 
metal cabinet for control and RF connections is a poor design and 
construction habit.  These connectors need their own conductors for the 
return path.

I ran #20 AWG buss wire to all the RCA jacks and bonded them to the chassis 
with a solder lug and also bonded to circuit ground.  I did the same on the 
two of the low-level SO-239 connectors.  The high-level SO-239 jacks did 
have solder lugs to circuit ground.

Finally, I discarded the two-wire AC line cord, and replaced it with a 
detachable, 3-wire IEC Corcom type with integral RFI filter. For those 
running a QSK-5, I highly recommend making these changes.

Paul, W9AC