This tube has a short brown base. This series of military production tubes are considered one of the very best 6SN7 variants. They were made in the USA from the mid-1950s to late 1960s. This tube has a production date of 1969.
This tube has a short brown base. This series of military production tubes are considered one of the very best 6SN7 variants. They were made in the USA from the mid-1950s to late 1960s. This tube has a production date of 1969.