That's truly interesting info regarding the EFL sets. I'll have to check mine at high-contrast and see how the tube behaves.
On the CC-II, I discovered a minor issue. Keeping in mind I never even took the back off:
On animated content, and with motion scenes, the color demod acts up. For example, it has the notorious green turning blue in spots, and vice-versa. The horiz freq appears to be fixed, no hold control to adjust.
Also, uniformly red/green/blue/white rasters are perfect, so this is not a purity issue.
I suppose I'll have to scope out the burst and demod circuits but I do NOT want to make this worse.
On my 19CC19 4-tube hybrid, I had a bad case of the rolling color bars which I was able to adjust out. But this one is a different beast.
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