Manufactured by Tung Sol, labeled and boxed as RCA. Great in your tweed Bassman and other Fenders and boutique amps that require 5881s.
Mike, 3 more matched pairs of the Tung Sol 5881 "Christmas Specials" (RCA label). The three pairs that you sent prior were really excellent specimens visually and sonically. Thanks. John
Same tubes as the pre 2001 Svetlanas, made in St. Petersburg Russia, but branded SED. These are the real deal. If you see "Svetlanas" for less, they may be ones from the Reflector factory which are not of the same quality level.
Standard matching within 3mA.
These work great in old Fenders requiring 5881's or 6L6's. Good substitute in 6L6GC amps where less headroom (breakup at lower volumes) is desired. Also make great replacements in Fender Deluxe's where more clean headroom is desired. Just plug into your Deluxe and re-bias, no circuit changes required. Excellent choice for most 6L6GC amps if you'd like a little less clean headroom. These hold up well in amps with plate voltage up to 470 volts.
Perfect in Bassmans, Vibroluxes, Pro Reverbs, UniValves, BiValves, Emery Super Babys, and most new production Fender amps.