Nice choice!
I have some 12ax7 labelled "Baldwin Organ" that I believe were made by Raytheon......or maybe it was Sylvania?

.....and were pulled from organs.
Whatever they are, these tubes are phenomenal wherever I use them. Better than all the Teles and other big NOS names I've tried. Currently doing duty in a Prima Luna Dialogue 2 integrated. Paired with late 50s Blackburn works factory Mullard CV491 (labelled MWT) and SED =C= KT88 this amp is liquid, fat with inner detail, and devastatingly musical. It is performing waaaay beyond my expectations!
Best of luck in securing a pair!