[Collins] Re: {Collins} Drifty 32S3 - Any Ideas?

[Wn4i]

It's not a good idea to push the heat of the 2  PA tubes inside the radio
.....the fan must be under the chassi to cool all the resistors under the
chassi ......the pa  is well designed with 21 holes around the 2  PA tubes
so the heat must go UP  ....the PA  is not heat sensitive .
With a 24 VDC,  4 by 4  fan under the center of the chassi the PTO back is
only warm  instead of burning my fingers tips after 1 or 2 hours at least in
Florida ...
The 24 VDC fan is only powered with only 9 or 10 VDC  with a diode and a
5000 Mfd 15 volts  connected to the 6.3 VAC  RCA jack in the back .with NO
MORE FREQ. SHIFT .
Also watch the Hi voltage supplying the PTO .
73
Yves Wn4i





----- Original Message -----
From: <W1PO@aol.com>
To: <collins@listserve.com>
Sent: Sunday, November 24, 2002 1:44 PM
Subject: {Collins} Drifty 32S3 - Any Ideas?


> Hi Guys,
>        I've noticed over the past year that my Winged Emblem 62 Vintage
32S3
> drifts about 500HZ when I use it in the split mode on CW (probably on SSB
as
> well but I haven't noticed it). I have a small muffin fan cooling the
finals,
> and this tends to happen after the radio is fully warmed up. If I monitor
it,
> it will start off and stabilize OK and then after a minute or two of
> transmitting it will drift about 500 HZ. After a  minute or two of no TX,
it
> will do the same thing again when transmitting. Both the 516F2 and the
32S3
> have been gone through by K7RMT and all the caps replaced. Tubes are new.
Any
> ideas?
>
> Dan, W1PO
> w1po@aol.com
>
> Dan Szymanowski
>
>
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