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Author Topic: Swan 500cx tube mod ??  (Read 4545 times)
K6REA
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« on: March 05, 2013, 10:19:28 PM »

Hi guys,
anyone out there have any instructions for the Swan 500cx., to replace the 6LQ6/6JE6 finals with 6146's ??

thanks,
kevin rea
k6rea
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KD0REQ
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« Reply #1 on: March 06, 2013, 10:23:33 AM »

poking around the ARRL website yesterday, I found in the transceivers section of tech an article on replacing the ftdx101 6JE6s with 6146s.  pretty comprehensive.

that is NOT a Swine, however.  it should be a springboard to research of the schematics.  an item of interest is that a whole lot of functions between transmit and receive are shared in transceivers (duh!) and changing parts like tubes to others of different interelectrode capacitance can have effects far down the line in the other mode.

best mode is to find 6JE6s and run them lightly, don't pin the meters and dim the lights.  if you must convert to use the radio, read twice and highlight all the parts of the article that concern component replacement.  those areas... weak blocking caps, bias issues, compensating capacitors to make up for lost (or extra) tube Xc and make the finals tune again... are where you can have major problems.
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