Glassware PS Tube HELP

I have a PS21B kit sitting in a box. Been reading thru the description to figure out the difference from the PS21. I think it is 12VAC vs. 6.3VAC secondary inputs. I think. I haven't looked at the circuits to confirm.

Last time I did a Broskie PSU, I ended up getting 2 transformers, one for the B+ the other for the heaters. Not the cheapest option but made me feel like it was betterer with 2x the transformers. 🤓
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Anyways, I have that PS21B kit. Would be up for a trade if the heater secondaries are betterer for you. Let me know.

I do dig his 12VAC kits. Reduces the assembly complexity but forces less learning opportunities.