upgrading x-can V1? anyone?

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Added 0.033uF film caps in parallel with higher value film caps for signal couplings.
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There are still 2 options in my plan, one is to change the 9pin tube socket to gold plated part with Gold lion 6922 tube, another is add bridge for the front LED and filament. Waiting for parts coming...

Anyone interested? I could share my schematic with upgrade markups.
I have one of this sleeping in my store for more than 20 years. Thinking to bring out to modify it. Mind to share your circuit?
 
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