When we voice our 300B based products we use the EH 300B. The EH tubes have proven to be extremely reliable for us over the past 10 years, and they adhere closely to the original Western Electric WE300B operating specifications at a broad range of operating points. Doc gets samples of boutique tubes to use every once in a while in our reference system - which uses not just a couple, but a total of 14 300Bs! The boutique tubes go into the system and get evaluated, only to be replaced by the good ol' EHs every time.
With some of our customers finding that other so called 300Bs in the aftermarket don't run at the proper voltages in their gear, we have decided to discontinue the option of ordering a Kaiju 300B amp or BeePre 300B preamp without EH 300Bs. It just makes sense to go with the tube that is reliable and sounds the best. We will continue to offer the option to buy one of these kits without 300Bs only through May 31st. So if you are determined to use a different 300B (a genuine WE300B should work great too), order your kit this month.
