[Amps] Henry 2K-3 amp restore
rdarlington at gmail.com
Tue Nov 21 12:03:11 EST 2017
I did clean the contacts as part of the troubleshooting process and used an
ohmmeter to make sure it was switching. Figured there was a chance I
banged into it while working but don't think I did. While testing, key
down, I gently pushed and tapped on it with a stick of G10 which is what
prompted me to clean the contacts. I was watching the antenna analyzer
draw out the curve on the input side while doing this and could see ~ 2.0:1
SWR jumping up to infinity and back on 80. I can't under any condition get
anything but infinite SWR on any other band setting. Very strange. I'll
get the deck pulled so I can get into the compartment under the tube
sockets and go from there. I wonder if somehow the two parts of the band
select switch got out of sync. I really can't see it from above for any
kind of testing so I'll have to pull the deck off the rest of the chassis.
On Tue, Nov 21, 2017 at 9:38 AM, Victor Rosenthal 4X6GP <k2vco.vic at gmail.com
> 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
>> 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
>> 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
>> 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
>> 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
>> 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).
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