[Heath] Heathkit HW-100/101 S-meter trouble

[Ron Hall, Sr.]

Dick, sorry for your troubles.  It's hard to remember that there is
HV in the transceiver instead of 13.6 VDC in present day units.

I don't remember the S-Meters circuit in the HW-100 but is there
by chance any small signal diodes such as the 1N191 or 1N4148
in the AGC circuit.  Seems that if such diode or diodes were there
they would have been damaged by your man made lightning strike.
Just a good place to start.

73 neighbor

Ron  KP2N
St. Pete., FL

----- Original Message ----- 
From: "Dick KF4NS" <kf4nsradio at verizon.net>
To: <heathkit at mailman.qth.net>; "Heath puck list" <heath at puck.nether.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Friday, March 16, 2012 10:24 AM
Subject: [Heath] Heathkit HW-100/101 S-meter trouble


> Ok guys, I am my own worst enemy lately. I can't seem to control my probe. 
> While doing some testing in
> the IF section of my 100 for gain problems feeding my SB-610, I had my DMM 
> probe on the B+ and while
> sweeping it away from the test point I caught it on a wire which caused me 
> to lightly touch ground and
> heard a pop.
>
> Now the S-meter is messed up. Turning on the rig the meter swings to full 
> then back down to zero (normal)
> then immediately followed by a swing back up to 9 +20 and stays there.
>
> With all the settings adjusted according to the receive voltage chart I 
> read -.8-15.8vdc (variable with
> the RF gain pot)  at the grid of V3 6AU6 1st IF and 289vdc on the plate, 
> all normal. I read .52vdc at the
> cathode. Swapped V3, tests good.
>
> At the meter pins on any band I read .25vdc on one side .32vdc on the 
> other with no antenna attached. If
> I touch the grid with a probe there is a loud squeal, no change at the 
> meter. Meter and meter switch are
> fine. CAL sig ON shows no change is meter reading (maybe cuz it would not 
> normally read that high). No
> burned resistors in the circuit.
>
> What the H_E double L did I do this time? It has to be in the AVC 
> circuitry.
>
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow!
>
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