[R-390] R-390A FL-101 repair/replacement...

[Barry]

Instead of modifying the rear panel, I would opt for a filter that mounts on some existing holes in the inside and has lugs for wiring, etc.  I just don't like to cut on a radio if it's necessary.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Jordan Arndt" <Outposter30 at shaw.ca>
> To: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Monday, May 2, 2022 1:01:13 PM
> Subject: [R-390] R-390A FL-101 repair/replacement...

> Hi group...
> 
> I'm going to have to replace FL-101 in 2 receivers, and I'm considering
> installing those Corcom computer type line filters in their place.
> 
> One has a broken solder connector on the B side of the filter output, and
> the one I was going to use to replace it shows both ~100uA leakage at
> ~200VDC and <10Meg of insulation resistance in both the A and B lines
> measured with my TO-6.
> 
> I also tested the broken filter for comparison, and there is no DC leakage
> at all, and the insulation resistance is as near to infinite as I can
> measure on the TO-6.
> 
> What is the recommended method to enlarge the opening in the rear panel to
> the necessary dimension..?
> 
> Would a Dremel tool with a cutoff wheel work..?
> 
> Any tips are greatly appreciated....!
> 
> 73...Jordan VE6ZT
> 
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