The relay control on the GM3SEK board became messy when using tetrodes or triodes with handles.
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There was also external parts that there were not documented? that had to be added externally for tubes like the YC156.
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There was no easy way to regulate or protect the screen? with voltages greater than 800 volts.
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So like most it was easier to use? your own protection circuits on? its own island connected with logic to protect the tube.
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F1FRV has set of triode and tetrode boards that will regulate screen voltages upto 1500 volts while handling the protection and sequencing eloquently.
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These boards are popular in Europe and have no rfi or other issues.
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I came across this video that was sent to me via a link of a CB operator building? a 4cx5000.? He has his own take on the Tsunami amplifier and has some interesting ideas for protection and metering
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Henry
