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Author Topic: Has Anyone Here Converted an LK-450 to 6m?  (Read 641 times)
K0XXX
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« on: June 01, 2005, 09:01:35 AM »

I have an Amp Supply LK-450 that has not sold so I am considering coverting it to 6m. Has anyone here done this or had it done? Did you add six to the aux position or make it a single band amp? Any info would be greatly appreciated.

Thanks!
Mark, K0XXX
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WB2WIK
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« Reply #1 on: June 01, 2005, 10:59:29 AM »

This is pretty similar to an AL-80, as I remember.

The 3-500Z lends itself well to six meter use.  I've never worked on an LK-450, but I've put two AL-80Bs on six meters and each worked very well once modified.  In both cases, I eliminated the bandswitch and therefore HF operations were also eliminated -- making them 50 MHz monoband amps.

That conversion is cheap and easy and in my case I used Jennings 2-30 pF vacuum variables for the new plate TUNE, and re-used the original plate TUNE cap for the "new" (6 meter) LOAD capacitor.  I also replaced the parasitic suppressor, changed the plate blocking/coupling capacitor, and made the new 6m tank coil using 3-1/2 turns of 1/4" copper tubing mounted between the TUNE and LOAD caps.  The only HTF or $$ component is the vacuum variable, but in both cases I found one by searching on line and paid ~$40 for it.

WB2WIK/6
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K0XXX
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« Reply #2 on: June 02, 2005, 11:46:52 AM »

Thank you very much for the reply, it gives me a good starting point for what will definitely be a learning experience. 73!
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