[Collins] Supplier for elecrolytic capacitors

Tue, 16 Apr 2002 10:06:16 -0400

John:

If your hum is 60 cycles, look for loose ground clamps, leaky tubes (i.e.
filament to cathode), etc.

The ripple from your 75S-1's power supply is 120 cycles/s, not 60. Adding or
replacing electrolytic filter caps will not affect this hum coming from a
full-wave rectifier.  Try and determine if the hum is 120 or 60 Hz before
ordering caps and tearing into a replacement job.

Vy 73, AI2Q, Alex in Kennebunk, Maine  .-.-.

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of John L. Lampitt
Sent: Tuesday, April 16, 2002 8:03 AM
To: [email protected]
Subject: [Collins] Supplier for elecrolytic capacitors

My 75S-1 Receiver has come down with a serious case of 60-cycle hum.  I
think replacing the filter capacitors might be the way to go to rectify this
problem.  Therefore, I'm looking for the name of a supplier for the
following parts:

C59 - 3 section of 40 uf at 150 vdcw. Part number 183-1701-00
C60 - 40 uf at 150 vdcw, Part number 183-1044-00

That looks like the only dry electrolytic capacitors in the power supply.

Any help would be greatly appreciated.

John VE3HN
[email protected]

Sponsored by the Collins Radio Association
http://www.collinsra.com