ECC33RX1

Branded Mullard

Base

Brown

Bottle Height

Short

Code On Tube

fX1 B7K

Factory Code

B - Mullard, Blackburn

Glass Color

Clear Glass

Mica

Double

Permanentid

ef9s9wwr

Pin Color

Silver Pins

Plate Color

Matte Gray

Tip Shape

Round Tip

Year

1957