[Hallicrafters] More S-40A Material

[J.G. Hoffman]

I have an S-40A (Serial # HA-968798) that has an 80 (four pin base) and the chassis is stamped "80".  
 
I also have an original S-40A Service Bulletin that specifies an 80 rectifier, and a copy of an S-40A Service Bulletin that specifies a 5Y3!  Seems that not all S-40As are the same.  Unfortunately, there are no dates or revision #s on the Service Bulletins.  They do have different fonts and layouts too.
 
Several questions about the S-40A, which I want to restore as practice before starting on the more complicated, heavier Boat Anchors:

 
1) I need just a little "touch up paint" (flat dark gray) to fill in the scrapes on the case, recommendations?

2) The installed speaker has a lot of distortion, I plan to install a jack in the grill at the back (no drilling) to use another speaker, this can be undone with only resoldering the wires and taking the jack out.  Or are replacement speakers available?
3) There seems to be some residual distortion in the audio (even with a better speaker), though it is listenable.  Coupling capacitor?  I was going to test all voltages/resistors, and replace the capacitors in the audio stages.
4) If the system is working should I replace the capacitors anyway?

5) Is there an easier, or more straight forward, way to get the dial back in calibration than endlessly tweaking trimmers back and forth and back and forth until it is not quite close enough? 
 
Joe 



 
--- J.G. Hoffman

--- drjgh at earthlink.net

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