The internal structure is well supported and is aligned with respect to the base pins to avoid internal shorts in equipment designed for horizontal tube mounting. The filament is center-tapped to ensure low hum. The Passport gives the exact test results for each individually numbered triode. It is unknown when we will be able to re-stock this tube. These Tesla 300B's are dual point matched for the best musical accuracy possible.
Every pair is inspected at the factory and comes with test certificates for each tube.
This is the 300B against which all other 300B's are compared. A recent review in Stereophile magazine placed this tube at the top of the 300B category, and this new production version is much easier to obtain than a vintage pair of bottles. Every triode is individually numbered, with its own test results included as well. Usually ships within 24 hours. The easiest way to buy vacuum tubes.