[R-390] First R390A - let the adventure begin

[Stan Gammons]

I don't know for certain, but I'd guess the MFP stands for Moisture 
Fungus Proofing.  It's a varnish or varnish like coating use to protect 
electronics from moisture and fungus.  I don't know that I believe the 
story, but I was told at one time it contained a poison to kill rodents 
that chewed on the wiring.

Congrats on getting your first R-390A.  I'm sort of at the stage you are 
with the one I recently bought.  It's very clean though. I replaced all 
of the paper caps and the electrolytics.  I have a couple of broken gear 
clamps though. I made a gear clamp out of some T6-6061 3/16" thick 
aluminum plate scrap I have. It needs dressed up a bit and the hole for 
the screw drilled but I think it will work.  I'd post a pic of it, but I 
don't believe attachments are allowed on this list.

Good luck with getting the one you have going.


73

Stan
KM4HQE


On 10/17/2017 03:11 PM, Thomas Hoyer wrote:
>
>
>
> -----Original Message-----
> From: Thomas Hoyer <thoyer1 at verizon.net>
> To: r-390 <r-390 at mailman.qth.net>
> Sent: Tue, Oct 17, 2017 10:25 am
> Subject: First R390A - let the adventure begin
>
>
>
> Picked up my first R390A fora reasonable price at a local hamfest this past weekend. It was dirty with afair amount of surface mold but seller said it was operational and would giveme my money back if it wasn’t. Local guy so I went for it.
>   
> Once I got it home I decidedthe best course of action was not to plug it in and turn it on, but to removethe modules, clean and inspect everything then determine a course of actionfrom there.
>   
>  From what I can tell, eachmodule appears original with the exception of the IF module where the filterarea was definitely worked on and a couple were replaced along the way.
>   
> I took to the internet andstarted researching the R390A radio. Talk about information overload! Lots andlots of info out there. I downloaded the MIL TM manuals and the Y2k document(wow, tons of research and effort put into that document!).
>   
> After finding this wealth ofinformation I have decided to walk through each module, replace the black/brownbeauties and other suspect caps as well as test the resistors and replace themas needed.
>   
> Last night I did a baselinearchive of each module recording part numbers / serial numbers and takingpictures. All of this babbling leads to my question for the start of thisproject…….
>   
> I’d like to know if thefollowing module part number / serial numbers align with the radio or if theymay have been swapped out over the years. This is probably old hat to most ofthe experts out there but this is my first rodeo with the R390A so here goes:
>   
> Radio SN – 4067, Contract 8719-P-55
>   
> PTO – Type 70H-12, SN 2529-D
>   
> Crystal Osc - PN 540 7609005, SN 4139
>   
> IF Module – MFP 1330 (whatdoes MFP mean?)
> BFO inside – Collins 70J-3,SN 6751
>   
> Filters:
> F455 N 160;  PN 526 9162 00;  SN 10 M 2
> F455 N 80; PN 526 9167 00;SN 10 M 2
> F455 N 40; PN 526 9160 009;SN 10 V 2
> F455 N 20; PN 526 9163 009;SN 6451
>   
> Audio Unit – PN 540 7553005, SN 4151 (MOD 1)
>   
> RF Deck – PN 540 7909 005;SN 4053
>   
> Power Supply – PN 540 7545004, SN 4056.
>   
> Judging by all of this itlooks like the Audio Module was changed along the way?
>   
> Thanks,
>   
> Tom
> W3TA
>   
> PS: I have experiencebringing other receivers /  boat anchorsback to life, Hallicrafters, Hammarlund, Collins 51S-1 and have lots of testequipment so I’m good to go there……….
>
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