[R-390] tube extenders

[Roger L Ruszkowski]

Roger,

Perhaps tube extenders aren't a must-have, but I have used them in the
R390A.  When I set the bfo to 455kc (with the knob at 12-o'clock), I use
the extender so I can tap off the circuit to a counter.  Perhaps there are
other ways to set the bfo, but I use this one.  The counter isn't sensitive
enough to pick up the signal without physically touching the pin.  Yes, you
could do this with the IF module outside the radio, but I just find this
easier.

I wouldn't discount the need/use of tube extenders entirely.

73,

Barry - N4BUQ

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Truth be known I do have a pair of each. I do use them.

But I sure would not let the lack of them prevent me from continuing
to work on a problem until I could have some in hand.

I sure would never suggest some else can not work on an R390
with out them.

I was taught  and did work on and did teach and did supervise a lot
of other repairmen, to day after day, problem after problem,
get in, find it, and fix it with out tube extenders.

Now remember this was the Army, 200 Hundred years of tradition unhampered
by progress.

No doubt better ways. No doubt not the only way.

I am in favor of getting on with what we got and not
setting around waiting for more materiel to arrive.

Roger.