[R-390] R390A RF deck advice

[ngietz at mymts.net]

Hi all, first I want to thank everyone who responded with advice about replacing C227 
(I think it was) in a general overhaul of this 1963 Teledyne RF deck.
Now, I have several more questions:
1)How critical are the values of the 27 ohm resistors on some of the grids?  A couple
are up to 36 or 39 ohms.  What effect if any would that kind of difference have on 
receiver operation or gain?
2)Some time ago I ordered some replacement slugs for the tuning coils and they came
with brass slot head screws rather than the Bristol spline screws I was expecting.  The 
slugs are still coded with the red and white dots.  Is there a chance I got incorrect slugs
or are the brass screw slugs just a late manufacturing change?
3) Does anyone disconnect the heater line on HR202?  Seems to me the crystals and
associated components would last longer without all that heat.  That corner of the
deck has the worst cluster of out-of-spec resistors etc., and I suspect the heat did it.
I’d guess there might be a slight effect on stability, but I’m not using it for RTTY.
Thanks for all your wisdom!
Nelson Gietz