[Hallicrafters] HT-32B Quit Working

[Jack Schrader]

And as has been said many times, clean the contacts with DeoxIT. My 32b had
many problems until I used DeoxIT.

----- Original Message ----- 
From: "Mark Bell" <bell at blazenet.net>
To: <dhallam at rapidsys.com>; "Hallicrafters List"
<hallicrafters at mailman.qth.net>
Sent: Thursday, January 13, 2005 6:56 PM
Subject: Re: [Hallicrafters] HT-32B Quit Working


> David --
>
> This may sound silly but.....
>
> Slightly move the band switch from the detent position and see if that
cures
> it.
>
> I have that problem on mine.
>
> Mark K3MSB
>
> ----- Original Message ----- 
> From: "David C. Hallam" <dhallam at rapidsys.com>
> To: "Hallicrafters List" <hallicrafters at mailman.qth.net>
> Sent: Thursday, January 13, 2005 1:13 PM
> Subject: [Hallicrafters] HT-32B Quit Working
>
>
> > My HT-32B quit working.  I used it one day and when I turned it on the
> next
> > day there was no output on any band in any mode.  With full RF drive and
> CW
> > mode, there is some indication on the output meter but my Bird wattmeter
> > just gives a little wiggle in the 250-watt position.  I checked the
usual
> > things, HV and LV, OK.  The 12BY7 driver tested OK and I tried
> substitution
> > of a different tube.  Looked at the VFO output on my scope and it looked
> > normal.  The tube in the third mixer tested OK and I tried substitution.
> >
> > Since problems are on all bands, I discounted problems in the second
> mixer.
> > Checking the first mixer and sideband switching oscillator, I noticed a
> big
> > drop in oscillator output on the scope when switching from 4.05 MC to
> 13.95
> > MC. (My scope is a 50 mHz scope.) However, the output from the mixer
> > remained relatively constant regardless of the oscillator in use.
> >
> > The speech amplifiers seemed to be working OK, as was the carrier
> > oscillator.  Using a two-tone test oscillator, the output pattern from
the
> > beam modulator on the scope was what I expected.  I tried substitution
of
> > another 7360 with no change.
> >
> > Now comes the part I don't understand.  With the scope on the grid of
the
> 9
> > MC amplifier tube, I see the normal "double bubble" RF pattern from the
> > two-tone signal.  However, if I disconnect the sideband generator cable
> from
> > the main chassis and look at the output (plate side of the 9 MC
amplifier)
> > of the SS generator on the scope, I see the two-tone audio pattern on
the
> > scope not the "double bubble" RF pattern.  I have tried replacing the
tube
> > with no change.  Resistance readings on all the SS generator tubes
appear
> to
> > be normal.
> >
> > Any ideas?
> >
> > David C. Hallam
> > KC2JD
> >
> >
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>
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