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Unless you sell all your tube electronics or stop using them permanently you will encounter another problem where having a scope will be helpful. Test equipment is the one thing I'll probably never sell even if I were to dump 95% of my collection...I know if I sell it, a week later I'll need it bad enough to regret letting it go.
Dealing with this without a scope is like trying to win a marathon when one of your legs just got amputated yesterday and replaced with a peg leg... Dealing with this with a DMM that isn't sufficient for the job is like running that marathon with only one leg, and that leg is the peg leg...
That said if your meter has a dedicated DC Volts setting you can measure DC current as a voltage if you have a power resistor of a known value. Connect a 1 ohm or 10 Ohm power resistor in series with the cathodes, clip your meter across the resistor and measure DC voltage. DC current will equal measured DC voltage divided by resistance of that resistor...A 1 Ohm will make the math MUCH easier.
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