[R-390] R 392 T-602 bfo

[Dan Merz]

Hi,  thanks to Roy Morgan for looking and reporting the pin order as 1, 2, 3
clockwise on  T 602 going from grid, ground, cathode so it should work the first
time I hook it up, hi.  thanks to the others that answered and offered help.  By
the way I must confess that this bfo unit is going into a Mackay 3010C that was
missing several subchassis units that I'm replacing,  bfo/bc band h.p. filter
and attenuator.  Somebody must have designated this a spare parts set at some
time and robbed it.  The dial tape mechanism is kaput also and missing some
parts - I have a nifty digital display kit put out by AADE that is programmable
for a large number of sets to adjust for i.f. / vfo that will fit nicely behind
the original dial window so that's my solution for repairing the dial,  at least
for now - unless I run across a source for the original 16 mm fiberglass dial
tapes.    Dan.

Dan Merz wrote:

> Hi guys,  with no answer,  I guess I'll take the next shortest route to my
> question and hook it up - if it doesn't work,  I'll reverse the two leads in
> question to get the phase correct.  At least I don't have to try 6
> permutations,  hi.  Dan.
>
> Dan Merz wrote:
>
> > Hi,  I am puzzling over the three connections to the bfo unit out of an
> > R-392 receiver,  T-602  type 70J-2.  Looking at the connections end on,
> > the one first one starting at 9 oclock is the the number 1 connection
> > going to the grid capacitor and the bfo pitch capacitor,  but then I'm
> > not sure about the other two that are adjacent going clockwise.  I think
> > the next one is the cathode connection (called number 3 in the schematic
> > I have) and the most clockwise one is the ground connection (called
> > number 2) in the schematic I have.  The schematic is from
> > TM5820-334-35-13,  which is the only documentation I have in hand.  I've
> > looked at the pictorals in this manual but can't convince myself about
> > this conclusion from the appearance of the wiring because details aren't
> > that good.  I did some resistance measurements but without knowing how
> > the lower leg is wound (continuous with tap vs. additional coil wound on
> > top of first) I don't really know how to interpret the measurements.
> > Does anyone know the answer?  thanks,  Dan.
> >
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