This listing is for a balanced NOS 12AU7 tube made by RCA for CEI.

Tubes test NEW 100% and passes life test.

The 12AU7 is a medium mu multi-purpose double triode in a 9 pin miniature package. The 12AU7 can only be used in parallel filament circuits. Like the 12AX7, this is not a hassle since virtually all hi-fi tube amps are of the parallel filament design. The early RCA version has ribbed flat black plates with a top getter and a white label. Still available, and still a bargain since everyone wants the “cleartops”: 1960s versions that have grey-plates and the getter on the side, making the top clear. These “cleartops” are currently the hottest selling 12AU7. 

Shipping: $3.45