A vintage, matched, NOS pair of WE 422A rectifier tubes.  This pair tests over 100% of NOS in our calibrated TV7 & 648S. Perfect matched pair from 52nd week, 1973 . Beautiful tubes and included original WE boxes with cotton excelsior packing. Both tubes tested twice on calibrated testers -- each tube tested 60/60 where the minimum value is 40 -- and 100%/100% ++ on a calibrated Jackson 648 at full load. No shorts, or gas. -- verified NOS / NIB. The WE 422A may be the best ever 5U4 upgrade design - it's a direct plug-in for most later 5U4's with octal bases. It is not a plug-in for 274's or early 5U4G's because their bases are different even though the 422A will work fine with a base converter. These are of excellent vintage construction...heavy black plates, 2 x side getter, lots of mirror flashing, tight bases and bright yellow print ... 39 years old .. Bell System, the real McCoy!  Simply one of the best recifiers ever made, even compared to the WE274 A/B. These will sell quickly as they are very hard to find ... especially perfectly matched like this. When compared to most 5U4's the 422A brings amazing focus, allot of detail and a tight, clean bass.  These beautiful tubes are Guaranteed no DOA. The 422A is so useful, it's fairly easy to predict, with continued trends it will be double in value after 10 years.  Truly great sound, one... if not the best octal base rectifiers we've ever heard in our WE 91 SE amps.   Comes with a BSP tube spec sheets as well as the sheet for the 422A.  100% safe packing in TRIPLE box.