Your misuse of Grn/Yel is ill advised.sounds good
Save Grn/Yel for Chassis to PE only.
I did some measurements.. It seems, that distortion of square depend on level output source.. the higher the level the greater the signal distortion and the transient also appear ...pictures are for same frequency, with different level..
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You have to remove the RCR mod. Both the zener mod and the RCR mod are obsolete. They've been replaced by the presence of C10 and C11. Build exactly as the released schematics. Also don't forget to connect the signal ground to main star ground with a dedicated wire! Unfortunately Jim's boards don't have a hole for that connection.
OK, I´ll try remove RCR mode and put back zener...will see
NO! Don't put back the zener! The zener must go! Only stays a 100k resistor as the shematics!
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In Jim's schematic also isn't coupling capacitor and input resistor..
Maybe Jim forget them too... You can DC couple the amp or mix couple but if you do that you must assure your source is DC free.
In rhe original form the SKA is a mixed coupled amplifier. It has a NFB capacitor but no input cap. It's of course safer to use both caps.
See the schematics of my other post. Follow it because it's the right one.
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