F32 B5E4 DATE CODE. RARE BRIMAR (MULLARD BLACKBURN) GZ34 f32. THIS IS NOS.
NOS Testing Mullard 5AR4/GZ34 F32 B3E3 OO Getter Guitar Audio Tube
RARE BRIMAR (MULLARD BLACKBURN) GZ34 f32. f32 B6J5 DATE CODE. SUPERB TUBE – TESTED STRONG AND WELL BALANCED.