[Milsurplus] SRR-11,12,13...

[Kenneth G. Gordon]

I just aquired a stack of about 18 of these radios and plan to get one or two 
working.

Is there some list somewhere on the various types of submini tubes and their 
characteristics? I mean JUST the submini tubes.

Although sensitivity is shown as around 1 to 2 microvolts, depending on where 
they are tuned, I am thinking that sensitivity and dynamic range can be 
improved a bit by tube substitution.

Can anyone give me specific information on what foibles and/or bad 
characteristics these radios exhibited while in use by the military?

I remember about 30 years ago changing the 2.2K screen resistors to 56 K 
and adding screen bypass capacitors in several SRR-11s to cut down on plate 
dissipation and reduce heat.

Also, I have a change order which replaced 5 of the 6 5647 diodes with 1N458 
diodes.

Lastly, I have an errata and/or change document which is 48 pages including 
diagrams. However, I am missing pages 1 and 2! Would anyone here happen 
to have those missing pages?  I would really admire to get a copy...

Actually, it is for the FRR-21,22,23, but those are just rack mounted SRR-
11,12,13.

Ken Gordon W7EKB