[Amps] Henry 2K-3 amp restore

Jim W7RY jimw7ry at gmail.com
Mon Nov 13 00:23:08 EST 2017

I would look for a ban connection on the meter switch for most of your 
issues.  Could be bad diodes in the "wattmeter". Never had to replace a 
diode in one of a Henry. It's probably more like a relative power meter than 
an accurate wattmeter.
It's also possible the meter itself has and issue. Check for static on the 
meter face keeping the needle from moving upward.

Also check for bad HV metering resistors.

As for a dial light, there are quite a few bayonet lamp LED replacements. 
Get a low color number. The lower the number, the more "soft white" it is, 
more like an original incandescent pilot lamp.

73 and let us know how you do.

Jim W7RY

-----Original Message----- 
From: Bob Darlington
Sent: Sunday, November 12, 2017 10:24 PM
To: Amps group
Subject: [Amps] Henry 2K-3 amp restore

Hi all,

After a 3 year wait, I finally have my Henry 2K-3 at home from a seller out
on the east coast.  I have it up and running and producing lots of power as
expected.  Amazingly, the ancient 3-500Z tubes are still humming along.

Having only received it yesterday, I haven't had a whole lot of time with
it yet but I immediately see a couple problems.  Initially the B+ was
showing just over 3kV but dropped down to about 2200 on the front meter.
Tapping/banging on the chassis causes this to fluctuate a bit but it won't
go back up.  My HV probe does show about 3300 at the connections to the
tubes (no tubes present during initial testing).  Does this sound like old
resistors in the metering circuit?  I haven't tested them yet, just taking
a guess and crossing my fingers that it's not a problem with the teardrop

The next issue is that the forward and reverse positions on the meter
switch result in no output to the meter.  I found an SWR bridge schematic
in another model Henry amp and assume that it's similar in the 2K-3 but
don't know for sure.  Is this the long rectangular box running on the back
right by the small compartment with the rear connections?  Any hints on
where to start troubleshooting this?   I have a pair of Bird meters so this
is less of a concern but it would be nice to get it working again.

And lastly, one of the two bulbs is out behind the front dials.  Do any of
you have a replacement part suggestion?  I'd like to use LED bulbs but I
don't know anything about sizing bayonet base bulbs and would prefer to
swap a bulb rather than a bulb and socket combo.

And word to the wise, if a friend says he'll be driving the 1800 miles out
to visit you in the spring, ask him spring of what year *before* you buy
the boat anchor.

Thank you,
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