You don't "need" a stack, but if you "need" to drop volts, and you are using a diode, you need a stack, no?
Our HV diodes, though not capable of such currents, dropped as much as
20 volts. There are like 60 series elements in an HV diode that drops that much.
isn't it obvious? Nothing on earth is desperate enough to get laid, that they will stoop to dimbulb's level.
Just in case you did not read what we are talking about.. It was replacing Tungar rectifiers in battery chargers.
Battery chargers rarely need 60 series elements to make a HV stack and whats more your 60 diodes would not be much good for 6 amps. Please try and stay on topic.
John G.
You'd probably have to do like the old radio guys do replacing selenium rectifiers and add a suitable power resistor in series with the diode.
I believe it was the bulb rectifier chargers that had a bad-news side effect.
They were half-wave, directly coupled to the line. If a shop had a large one, & not much other loads; the pole pig transformer core would start to saturate with DC.
And when it did... it would fail rather spectacularly.... as in KaBoom...
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