[Collins] 51J4 Alignment Question

[Carl]

> Most likely to compensate for tube degradation and minimize time in a 
> service shop.
>

Probably so.  I haven't compared the with vs. without schematics in detail. 
Unless something else changed, the control would only reduce gain.  I don't 
see any reason to mess with it at this point.  Perhaps I have a fortuitous 
weak tube(s) somewhere :)

FWIW, a 51j4 with the Lankford product detector and AGC mods (and 4:1 tuning 
with a weighted knob) works exceptionally well.  I did have to make a couple 
of minor changes to the Lankford circuit values for best performance in this 
particular radio, but I am really pleased with the results.  And Sherwood 
modified my SE-3 to work at 500 khz also -- best of both worlds.

Grant NQ5T


And what were those changes Grant?  Mine is still a virgin.

Carl
KM1H