Don't worry I have over 50 pieces of valve gear, primary Mcintosh and 10-12 pieces of Cary Valve gear. V12Rs are one of my all time favorite
valve amps. I'm pretty impressed with the SLP-05 too and I NEVER thought I would like any preamp more than the Early Mcintosh preamps.
Mcintosh C20s are one of the most colorful and have more tools via Bass contour, Tone Controls, Variable loudness, and several options on
low and high filters, not mention with just a little bit of work offer .05 distortion vs the factory of .5 THD. Onboard dual turntable preamps
for MM, MI and MC carts. C11, C22 90% of the parts interchange and they have almost all of the same features as a C20. The two issue is
no remote and like ALL early Preamps crosstalk. You can mitigate most of that with RCA stoppers.
As for the basement, it's not connected to the fallout shelter. AND EMPs don't just come from bombs.

They used them to stop SS ignitions
on anything with any of the newer ignition system (70s forward, close). Not that hard to build actually. Even newer diesels have SS injectors and
COPS have access to EMP Pulse guns. Few cars/pickups or semi are shielded. The problem is many steering and braking systems now requires a
hydraulic pump to work.
Kill the engine you get to pull over, period. Loose a serpentine belt has the same effect. Some of the manufactures are going to electric
hydraulic pumps and electric turbos, BUT they are subject to EMP pulse guns also. Catch 22.
Enjoy your new amps and remember that single tube has to be a good full range valve and test as matched top to bottom. Not knowing the circuit,
a simple roll depending on the valve can make a LOT of difference.
6922, AT series, and the 6 volt 6Nxxx all have many alternatives. Tellies, Mullard's and SOME RCA are hard to beat.
Most new stuff is JJ, not my favorite, but very reliable considering. My Herron V2 TT preamp came with them, very reliable.
12 years old, never a single problem. It's actually the best TT pre I've ever owned for the money.
Regards