[AMRadio] Which older rig would be easiest to renovate/repair/and get ru...

[Donald Chester]

My pre-WWII National HRO was very easy to repair because all the components 
were easily accesible and you could easily get a meter probe to all the tube 
socket pins.  Components under the chassis were laid out in a single layer.

The 75A4 is more  difficult because of the depth of the chassis and the 
component density.  In some cases it is nearly impossible to get at certain 
components without unwiring other components, and Collins liked to wrap the 
wire around and through the solder lug several times (and tie a square knot, 
it almost seems) before applying solder.  It is hard to unsolder a 
connection without melting the insulation or heat damaging nearby components 
and wiring.

I recall working on a 75S1 receiver.  It was a nightmare.  The same deep 
chassis, with components literally packed  several layers deep.

Don K4KYV

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