[Amps] Henry 2K desktop amp

[Dave Hachadorian]

I have an SB-220 that developed a high resistance between the tube socket 
and the filament pins.  I would pull the dark tube, inspect the filament 
pins to make sure they haven't overheated to the extent that the solder has 
dripped out.  If so, re-solder.  Measure continuity between the filament 
pins.  Polish the filament pins and socket filament contacts the best you 
can with contact cleaner and Q-Tips.  Reinstall the tubes, swapping 
positions, and see what happens.  When you reinstall the tubes, push them in 
and out a few times to further polish the contacts.  In my SB-220, that is 
all that it took to get it going again.

If the filament is dark, there is no need for further testing with RF until 
you solve that problem.


Dave Hachadorian, K6LL
Big Bear Lake, CA

-----Original Message----- 
From: Ted Rachwal
Sent: Thursday, June 27, 2019 8:46 AM
To: amps at contesting.com
Subject: [Amps] Henry 2K desktop amp

All of a sudden I have a very high swr between the rig and amp...3:1....
I notice one of the 3500Z tubes is not lit.  I'm wondering if I can pull
the unlit 3-500Z and try the amp to see if the issue is the tube or some
other part.  I have pulled a suspect 572b and 811 in the Ameritron
series of amp and all was ok but wonder if the remaining 3-500Z would be
damaged if I tried this trick?  Anyone have a thought here?

73,

Ted K8AQM


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