Very nice you blue cap hoarder. Now I know why they are getting so expensive. You have created a shortage.
Not saying my work is as nice, but this looks a lot like my builds. PTFE, blue molded, and epoxy beige except sometimes I have to use red.
My hoard is about gone Ed...
I just got me some of that Blue G10 from Watts and it's sitting waiting for you know who to do something with it. I am still brain storming my 1 channel AB763, no Trem and added goodies. Might do a pair of KT120 just cause I can LOL... Headed to Dallas March 9-12 for a big Steel Guitar Convention. When I get back I need to start penciling that thing out I guess.
Kt120 for a steel build. I have done that. The plates on these things will take a lot, but be careful of the screens. Not sure of your intended voltages, but i ran 569 plates with 40%Ul taps no problem. When i tried them with a 3.9k screen dropper the tubes started humming immediately. Backed down but too late.
Successfully i did 504 plates with 492 screens and they have been fine. I found out I prefer them running UL, but a friend has 4 running in a Traynor and they are in the same voltage range. Just thought i would pass this along as it feels bad to melt screens on new toobs.
I have used them a lot now and the bass extension is true. Compared to original gec kt88 i favor the 120 simply because the top end has a rounder tone.
I will say you can feel these things in your chest and if it is for a steel amp they have a nice lower mid sustain when paired with jbl, altec type speakers.