[R-390] 390() vs 390(A)

[Barry Hauser]

> It can ba a LOT of turns from one end of the R-389 tuning range to the
> other (up to 50), so that's why the motor-assisted main tuning in that
> radio.  (The second motor in the R-389 switches the first IF stage
> automatically as you tune within either of the two tuning ranges.  You
> can't do with out that motor that I know of.)
>
> Roy
>

If the tuning motor goes out, you can always use your reversable, variable
speed drill.  Just remove the knob, chuck up the drill on the shaft and go.
Use a drill with an adjustable clutch, in case you're too slow on the
trigger finger when you approach the stop.

For those suffering from '390 wristitis, a "two-gun" approach can work on
your R-390 or R-390A.  It will also give you some idea of what it's like to
run an R-391 autotune -- on the cheap -- except for the part where it stops
on one of the 8 pre-sets.  But then, again, most '391's don't get that part
right unless tended-to in advance.  You will get a fair sample of the whine
and clatter, though.

Barry