[MRCA] SCR-284 - BC-654 progress 3.11

[scottjohnson1 at cox.net]

The are likely "wet" electrolytics, which seem to last almost indefinitely.

The grey colored military "extended life" electrolytics are also
surprisingly long lived. Probably due to excellent sealing.

I for one am not an advocate of wholesale component replacement, but I have
waxed on the subject in the past, so I'll refrain.

I replace "on condition", or as the USAF/USN say "IRAN"- Inspect and Repair
As Necessary.

 

Scott W7SVJ

 

From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf
Of Ray Fantini via MRCA
Sent: Friday, February 28, 2025 09:32
To: mrca at mailman.qth.net; MMRCG at groups.io
Subject: Re: [MRCA] SCR-284 - BC-654 progress 3.11

 

Addendum to 3.1, Last night removed the connections to C19 and 23 and
checked them and as I suspected after eighty years, they are still good.
Don't know why but those old early large electrolytic capacitors somehow
hold up well. On the other hand, there are two Sprague wire would resistors
that somehow deteriorated to a point where the leads broke right off when
touched. Now will need to replace them before anything else gets done. Do
not see any signs of water damage or other corrosion anywhere else in the
radios but cannot explain the deterioration of the two Sprague wire would
resistors. Anyone else seen this?

 

Ray F/KA3EKH

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/mrca/attachments/20250301/4f6bde85/attachment.html>