[R-390] Out of the closet!

[Les Locklear]

Paul,

The last PTO is a Progressitron Corp. PTO. It is a conventional "corrector stack" type PTO similar to the Collins, Motorola and Dubrow. 
The only different design was the Cosmos PTO.

Les Locklear
Gulfport, Ms.
Dx'ing since '57


  ----- Original Message ----- 
  From: Paul Galpin 
  To: R-390 at mailman.qth.net 
  Sent: Wednesday, January 20, 2010 1:56 PM
  Subject: [R-390] Out of the closet!


  Hi there!

  Some many years ago, I was given a 390A to repair - symptoms: dead.  With
  help from this list, I got it going again, and, on the day of moving to my
  present retirement address, I was offered it at a good price. Unfortunately,
  finances were very doubtful at that stage so I had to pass on it.
  Since the I have been lurking on the list, drooling with envy!

  Lady Luck has been around, and today I took possession of 2x 390As, one
  working, the other not, that's what the seller says.

  OK, I know about the obvious things, like C553(?) to protect the filters,
  but what can I learn from the ID plates?

  "Working" has

  Ser No 2114
  Imperial Electronic Corp
  37856-PC-63

  PTO ser No 1551
  Dubrow Electronic Industries
  Type 798 BM101
  this label appears to be stuck over a different previous one.


  "Non-Working" has

  Ser No 3123
  Teledyne Corporation
  35064-PC-62

  PTO Ser No 7867
  Type 798
  P???R??STRO???Corp

  What does this tell us?

  The 390A I worked on long ago had the gears smothered in grease, put on by
  the handful.  These two sets that I have just got have very clean gears,
  with a trace of oil only. Which is correct? Which is typically original?


  Paul Galpin
  ZS2PG


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