This exhibit is a 6189 special quality version of the ECC82 double triode.![](../pics/acn0103a.jpg)
The two sections placed between double mica discs.Thanks to Mark Mallison for sending the images.The thin glass tube envelope is mm in diameter and, excluding the B9A base pins, is mm tall.Reference: Data-sheet. Type 6189 was first introduced in 1957. See also 1957 adverts. |