[R-390] R390 Number Stamp Under ID Plate

[Les Locklear]

Many years ago I had a R-390A/URR from the 1962 Amelco build. The nomenclature tag was stamped 2444. When the tag was removed, the same number 2444 was lightly stamped with metal stamping tools. Out of all the 390A's I had pass through my hands it was the best performing one. Only one module had the same matching serial number, the power supply transformer.

When they were being manufactured, there was always going to be a few that didn't meet specs and were pulled for repairs and that would throw the serial number sequence off. It could be any of the modules which were swapped quickly and repaired later. As to the front panel, when they ended up at an overhaul depot (Tobyhanna for example), they were completely dismantled, cleaned, repaired and put back together with what ever modules, panels, etc. were in the repaired stack.

Les

"I wake up in the morning with nothing to do, and by the end of the day, I only get half of it done".


----- Original Message -----
From: thoyer via R-390 <r-390 at mailman.qth.net>
Reply-To: thoyer <thoyer1 at verizon.net>
To: Les Locklear <leslocklear at hotmail.com>
Cc: Collins R-390 HF Receiver List <r-390 at mailman.qth.net>
Sent: 2/24/2021 7:21:20 PM
Subject: [R-390] R390 Number Stamp Under ID Plate
________________________________________________________________________________

Working on R390 S/N 334. Tonight's project was to clean up the front panel.
It is in pretty good shape except where it looks like someone used a sharp
object to scrape off a label under the ID Plate so there are several
scratches there. Maybe one day I'll repaint the panel, but not right now.

Question for tonight is.... When I removed the ID plate stamped under it in
black ink is 347. What, if any, significance is this stamped number?

Tom
W3TA
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