{Collins} Re: 75S-3 advice



Hi Ron,

There's an audio tube there that's known for it's heat output.  I've never
read about the discoloration of the cover due to that, but if something had
been stacked on top of the receiver I guess it's possible.  You'll probably
get several suggestions about the tube; mine is to replace it with a solid
state replacement available from Tubesters (do a Google to find their URL),
or you can make your own.  No circuit changes are necessary.  Another
possibility is that the audio transformer (which is back in that corner
also) is shorted.  If possible, listen to the radio to be sure there is good
audio.  And check the temperature of the audio transformer:  it should run
cool, except for some heating by that nearby audio tube.

I have a 75S-1, and it's a great receiver.

Hope this helps.

73,
ed - k9ew

----- Original Message -----
From: "Ron Skipper" <skipperclan@xxxxxxxxxxxxxx>
To: "collins" <collins@xxxxxxxxxxxxx>
Sent: Friday, October 29, 2004 0:12 AM
Subject: {Collins} 75S-3 advice


> Hello all,
>
> I am contemplating the purchase of a 75S-3. I have seen pictures of it,
> and it really looks exceptionally nice. The only thing I noticed is that
> there appears to be a "hot spot" on the right rear inside of the top
> cover. It looks as if the heat from a tube has caused disclolration of
> the cabinet paint.
>
> Is this cause for concern?
>
> Thanks in advance.
>
> Ron Skipper W8ACR
> Rugby, ND
>
> Sponsored by the Collins Collectors Association
http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
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Sponsored by the Collins Collectors Association http://www.collinsradio.org
Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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