[Collins] Re: Manual Changes

[David Knepper]

Reference was to the 30K-1 in the subject line. =20


David Knepper - W3ST
Secretary to the Collins Radio Association (CRA)
Publisher of the Collins Journal
www.collinsra.com
CRA station call - W3CRA
  ----- Original Message -----=20
  From: David Knepper=20
  To: collins@mailman.qth.net=20
  Sent: Sunday, November 03, 2002 6:04 AM
  Subject: Manual Changes


  With only 150 of these units ever being manufactured by Collins in =
around 1948 and 1949, you would have thought that there would have been =
some degree of standardization - WRONG. =20

  I have two units under restoration.  I thought that the bias and =
screen supply decks would be interchangeable.   After about an hour or =
so of pulling the units in and out.  (They are not light) I noticed that =
 Pin 5 is tied to the primary power transformer on the one deck but on =
the other low voltage power supply deck, pin 5 has no connection.  I =
spent about an hour trying to figure out why the one deck would not work =
in the one 30K-1.   Had I referred to both schematics - which I did =
later - I would have discovered the problem.  Seems like the one side of =
the screen supply power transformer goes to pin 4 in the early serial =
number 30K-1 and pin 5 in the later serial number 30K-1 that I own.

  Lesson:  We know that there were numerous manual editions for later =
Collins like the 75A-4 and KWM-2's.  But I never thought that there =
could be more than one edition for the 30K-1. Incidentally, the two =
manuals look identical with no reference to dates.  =20

  Remember to make sure that the schematic/manual edition matches the =
radio.  When you buy a Collins always determine if the manual is the one =
that came with the radio or was the manual from an earlier or later =
radio.  On some of my 75A-4 manuals, I noticed that the original owner =
penciled in the serial number inside the front cover - which is good =
idea when servicing the radio.=20

  By the way,  have you noticed the new additions to the CRA website =
homepage at the bottom left with reference to QTH.NET and the December, =
2002, Collins Album section?

  Thanks.

  David Knepper - W3ST
  Secretary to the Collins Radio Association (CRA)
  Publisher of the Collins Journal
  www.collinsra.com
  CRA station call - W3CRA


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