EL34 Mullard Xf1

EL34
Mullard xf1 B0H2
Used
0221-2012

ref: http://www.tube-classics.de

1958-1961
Mullard EL34 Xf1

Code: xf1 BXX

Identified by:
- double ring getter
- base larger than glass

Comment:
Rare. There are 7 different large bases. Some without hole in guiding pin!

Photo:
Mullard EL34 6CA7 with large big base Blackburn xf1 code double ring getter