Lessee here,
Sovtech, Sveltana, Ei, (the Chineese), Tesla-JJ, Western Electric, KR Enterprises, Philips, and the list goes on.
It would be as loss but this will not justify and attempt by toob theives, er salesmen to ramp the price up again. Toobs are already at the critical price point.
As SS catches the sound of toobs without the hassle of bias and burn-out the justification for toob usage is starting to wane. And yes I still use toobs.
loon