[Hallicrafters] HT-32B Quit Working

[Mark Bell]

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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