Sometimes it is better to have LESS test gear. Watching my 5 MHz VFO on the frequency counter was driving me nuts. If I hadn’t had the counter, I might have been satisfied with the VFO. Ignorance is bliss! It did settle down a bit. But then it would wander off. I hated watching it drift around. I have been spoiled by Doug DeMaw’s VXOs. So, I went for the VXO. It will run around 23 MHz. I’ll build the filter at 5 MHz. That’s definitely the plan. For now.
I intend to go back and build a real VFO someday. There seems to be a lot of magic and lore involved. Bees Wax! Hot Glue! Nail Polish! Q-Dope! Air-wound coils!
TEK 465 is still broke. I think it is the high voltage supply or (less likely) the CRT.
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Or you could just hook one of your AD9850 frequency synthesizer boards up to your Arduino…….