Well, here's the results. I purchased the Ameritron choke from MFJ.
Installing it into the L4B was not a problem. It had to be shortened by 1/2"
- which was easily accomplished by CAREFULLY cutting off the top of the
Ameritron coil with a ceramic blade on my table saw.
I worked the contest this past weekend (1500+ contacts) with the amp. I'm not
shy about pushing the L4B. I couldn't notice any difference in performance.
I will rewind the L4B coil and keep it in reserve. Thanks to all who offered
advice and counsel.
73, Wayne N1WR
From: Wayne Rogers
Sent: Monday, January 02, 2012 6:59 PM
Subject: L4B Plate choke
I just opened up my L4B to do some minor work on it. I noticed that the plate
choke looks like it has overheated - discolored brown around the middle of it.
Wonder if anyone has experienced this - common problem with the L4B? Or a
symptom that something is wrong?
The amp works fine otherwise - good power out, no sign of parasitics. I do
work it hard in contests, and run full power in CW.
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