By Glen Millen VK2FC

These few pages are my personal notes (mainly photographic records at present) on modifying and implementing various circuit improvements to enhance the operational performance and reliability of the Kenwood TL-922 H.F. Linear Amplifier.  Most of these ideas came from researching the web on how to improve this fine linear amplifier.  After working on quite a few of these amps over a period, I've settled on the modifications depicted in the following pages as some of the most desirable for me, these being Q.S.K. for SSB/CW operation, step/start A.C. mains supply and improved amplifier stability & VHF parasitic suppression.  There are a number of ways to achieve these outcomes.  If you have questions please send me an e-mail and I'll do my best to assist.  Implementing all of the modifications will take around two full weekends but well worth the effort in the end.  Hopefully my TL-922 modifications page and the other sites on the web will provide enough information to make it easier to attempt your first conversion.

There is still a good supply of these amps on the used market and occasional bargains do come up from time to time.  Sometimes even a 'new' one pops up.  The photos below are of a unused and unmodified Kenwood TL-922 offered on e-Bay in 2009.  The final price was around US$1,700.00.

Click on an image for a higher resolution photo!

Last updated on Tuesday, 09 February 2010

 

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Amateur Radio VK2FC