[Amps] L4B Plate choke - Follow Up

[Wayne Rogers]

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
To: amps at contesting.com 
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.

Wayne N1WR