RadioGuy wrote:

Thank you Ted for your valuable input regarding the 6JB6. I think I am
begining to see a picture develop... Somewhere I learned that Drake was
buying those Sylvania 6JB6's for 50 cents apiece. That was fine for
Sylvania with a bunch of tubes and no market in TV receivers and made for a
better profit margin for Drake. When it came to a choice for a final tube
Drake said to heck with the 6146's. I note that inside the rig there was a
note that the tubes were to be replaced with Sylvania tubes only. Some
speculate that this might have been due to some special deal or
understanding between Drake and Sylvania or perhaps it was simply due to
lack of interchangability.

Different brands of tubes had slight variations in internal
capacitance and could upset the neutralization. By sticking with one
brand you had a better chance of changing the tube and being able to go
right back on the air.


--
Former professional electron wrangler.

Michael A. Terrell
Central Florida