[Collins] 32S-3 problem.

[David Knepper]

  I have discovered that the shaft on the bandswitch will shift and needs to
be repositioned and relocked with the set screw.

  Look in the side hole of the aluminum coil shield to inspect the position
of the switch contacts.  This alignment is critical as you well know for
proper operation.


  Dave, W3ST
  Secretary to the Collins Radio Association
  Publisher of the Collins Journal
  www.collinsra.com
  ----- Original Message -----
  From: "Dr. Gerald N. Johnson, electrical engineer" <geraldj@isunet.net>
  To: "WB7DYW Dutch" <wb7dyw@ev1.net>
  Cc: "Collins on qth. net" <collins@mailman.qth.net>
  Sent: Wednesday, May 05, 2004 11:12 PM
  Subject: Re: [Collins] 32S-3 problem.


  > 300 volts is a bit high for the control grids, they need to be more like
  > 35 or 40 volts negative. Screens at 300, though you will get grid
  > current with the screens at 0 also.
  >
  > If you have output on 40 meters but off frequency that would hint that
  > you are tuning up on the mixer injection frequency rather than the
  > signal frequency. That could be a hint that a variable capacitor tuning
  > the slug rack coils has gone open. Not an uncommon failure mode in the
  > ceramic trimmers. A quarter drop of Deoxit on the rotating contact (near
  > the center) underneath with a bit of mechanical exercise (unfortunately
  > wrecking the alignment) may help.
  >
  > After you replaced the 6CL6 driver you need to have readjusted the
  > driver neutralization and probably the feedback neutralization, else
  > that driver may oscillate at odd tunings and out of band.
  >
  > Signal on pin 5 of the RF amp but not on the grid of the 6CL6 could hint
  > that the RF amp screen or plate voltage has gone to zero, or that the
  > tuned circuit has gone way off resonance from the trimmer capacitor
  > failure.
  >
  > 73, Jerry, K0CQ, Technical Advisor to the CRA
  > --
  > Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
  > Reproduction by permission only.