Just as a little follow up: I've built my second Pentagon and it has exactly the same issue
I have pretty much tripple checked everything by now and used the Pentagon with another tv (even tho the tube TV I first used works fine with my Pentagon1024SL) ... I'm starting to get a little frustrated since I don't have access to an oscilloscope/frequency counter.
Could my failing RGB signal come due to me using a 74ls37 (555ЛА12) instead of a "real ttl" 7437 155ЛА12 for D72 ... wikipedia said they "should" be compatible?
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