[Amps] Henry 2K-3 amp restore

Victor Rosenthal 4X6GP k2vco.vic at gmail.com
Tue Nov 21 11:38:23 EST 2017

Make sure the contacts on the t/r relay are clean and that it is pulling 
in properly.

Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
On 21 Nov 2017 18:32, Bob Darlington wrote:
> Confirmed, the front panel does use Sylvania 1815 bulbs and the LED
> replacements from Amazon worked just fine.  I replaced the little GE 330
> bulb in the power switch with an LED equivalent as well.  Turns out the
> 1815 bulb is listed in the parts list and I just missed it the first time
> around.
> The knobs do use Bristol set screws.  Never heard of this standard before
> but now I own a small set of them for future work.
> Got my first signal report on 40 meters.  The guy said I just about knocked
> is radio off the bench.  Clean and crisp and loud.
> And then I went back into the amp last night to add in a pair of diodes on
> each meter and to take some pictures.  I managed to unstick the sticky
> "multi" meter on the left.  I pulled the tubes and cleaned the chimneys and
> reassembled after doing a little cleaning with a moistened paper towel.
> The date code on the tubes is 7813.  13th week of 1978?
> And after putting it back together I get no output.  I did for a short
> while and I'm not at all sure why I'm not getting output now.  Only on 80
> meters does the thing make the familiar hum and show grid and plate
> current.  And that's intermittent at best.  I have to slam it into position
> for it to work.  SWR meter on my K3S is moving around a bit.  Knocking my
> knuckles on the chassis gets it to stop working and I have to give it a
> good slam get it to produce power again.  Every other band shows high SWR.
> Sigh.   Time to pull it apart and get it on the bench and rig up a signal
> source and scope and troubleshoot.  The SWR curve on 80 while it is working
> looks to be quite different than it did before I broke it (I used an AA-55
> to get a baseline curve and stored them for later comparison).  It feels
> like there is no input RF connection out to the filaments and yet I do get
> output on one band (sometimes).
> -Bob

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