NOS in original military boxes and plain white boxes (original boxes are dry rotted and moldy). Great for any 6L6 amp with plate voltage at 450V or lower. Same spec's as 5881s. Great for Fender Tweed style amps, Bassmans, Vibrolux Reverbs, etc. Slightly less clean headroom than 6L6GCs.

Some have black bases, others brown. Some pairs have one of each colored base in order to get the best current and mutual conductance match.