[R-390] IF Transformer Question and New Intro

[Larry H]

John, welcome to the group.  These are a marvel, aren't they.

All 3 of the 'IF's have 2 slugs (top and bottom) accessed through the one
top hole in the IF can.  You need a special tuning tool to access the
bottom slug through the top slug.

The exception is the Z503 which looks like an IF, but is not.  It's a
single tuned coil.

Has the killer cap C553 been replaced, yet.  Do not continue to operate
until it is.

Have fun with your new toy.

Regards, Larry

On Mon, Apr 8, 2019 at 5:53 PM <jgedde at optonline.net> wrote:

> Hiya Fellas,
>
>
>
> My name is John and I'm not only a new R-390a owner but a new member of the
> group.  I found a R-390a for sale online and I got good vibes and bought
> it.
> It cost a small fortune to have it shipped to me, but I scored a working
> R-390a and I'm having a ball with it.
>
>
>
> My R-390a is a true mongrel.  Motorola power supply, Teledyne IF Strip, EAC
> AF section, Collins front panel - all circa 1962/3.  As for the crystal
> section and the RF deck I'm not that far into it yet to know who made them.
> Nonetheless, this receiver is a solid performer and just get's better as I
> tweak it all back into health.
>
>
>
> Here's my IF transformer question.  In an attempt to readjust the 455 kHz
> section, I cracked two stuck slugs in the transformers - one is backed out
> almost all the way.  No worries there as I have some new slugs on order
> from
> Fair and can get them out using the old coping saw blade trick.  My
> question
> is that the Y2k manual and the TM's list two slugs in each transformer.  It
> says something about drilling or punching a hole in the cans to access
> them.
> My cans have an existing hole at the top but from what I can see, there is
> only one slug in each transformer.  Am I missing something?  Since I
> monkeyed with the slugs, I have lost some performance.
>
>
>
> All in all, the R-390a is a masterpiece and runs circles around my modern
> Icom and Drake stuff.  The R-390a is amazing at pulling intelligible audio
> out of the mud.
>
>
>
> John
>
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