[TenTec] Centaur Tubes odd ones in parallel

[Stuart Rohre]

I think QST had a piece on balancing tube emission characteristics.

That would probably let you match them "close enough".  If they were 
made pretty close to the drawing for standard tube of that type, likely 
you could operate them although of differing brands.

You could also back off on operating the tubes at maximums, and extend 
their life even if exactly matched.

Stuart Rohre
K5KVH