GE 6680 matched quad

george daniel
george daniel Posts: 12,096
edited March 2012 in The Clubhouse
6680: Motorola and GE are the brands you find most often with this tube, but RCA made a nice cleartop version for a very short time. It is identical to the 12AU7, but has the added benefit of being able to withstand variations in filament voltage without affecting it's output. This tube was designed originally for two-way mobile radio use. It makes a fine hi-fi 12AU7 tube as well. Never as plentiful as other types, this tube is rather scarce today.


Time to give back to the community---winner will be announced by Saturday--Karma open until 6am Sat.

Bought here from Russman.

Good luck
JC approves....he told me so. (F-1 nut)
Post edited by george daniel on

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