[R-390] A tale of two IF decks.

[rbethman@comcast.net]

I noticed a couple of other differences between an early Collins IF - S/N 35
vs. a '67 EAC IF.  The Collins Z503 and the like do NOT have holes in them
to allow adjustment.

The early Collins IFs that I saw WITH holes, were obviously NOT done at time
of manufacture.  It is easy to see that they were drilled out later.  They
usually have "flashing" around them.

I am guessing, but it was probably done at a later date to align them.

Bob - N0DGN  Craf-T-Bob (mywebpages.comcast.net/rbethman/)
(Because I love Hallicrafters!) R-390A EAC '67, R-390A Collins '52,
BC-610I, BC-939B, and BC-614E


----- Original Message ----- From: "Philip B Atchley"

| Hello one more.
| Just pulled the IF deck from Dons R-390A.  Even before pulling it I
| "suspected" it was an "older" unit.  It is, it's an early Collins IF
| deck.
|
| So, out of curiosity, I put it next to the '67 EAC IF deck from my
| receiver.  There are many observable differences.
|
| They are...
|
| 1.  Most noticeable is the lack of filter trimmers on the Collins unit.
|
| 2.  The Collins appears to be "neater" in it's construction.  I.E.  The
| cable harness is much neater, point to point wiring is neater also.
|
| 3.  The Collins has everything coated with that MFP crap which is going
| to make re-capping a tougher job.
|
| 4.  The EAC deck had nearly all capacitors of the newer type, I.E. Yellow
| Aerovox and metal/glass.  Only one "Brown beauty".  The Collins is full
| of the BBOD's
|
| I believe this is an example where I'd take the EAC over the Collins
| every time as it has all the updates.