Mullard 5AR4 tube GZ34. Date code f31 B9C. Check pictures. Double O getter. (DS rectifier bin). Tube = 49/50.
Mullard GZ34 5AR4 F31 Fat Base OO Getter NOS NIB Balanced
Price is for one Mullard GZ34/5AR4 F31 Fat Base OO Getter NOS NIB Balanced Made in Great Britain, carefully tested on TV-7/U at 56-56/40 min good (60=100%) no short, no gas, function flawlessly in my hifi system, matched and balanced.
Mullard GZ34/5AR4 F31 Fat Base OO Getter NOS NIB Tested Balanced
Price is for one Mullard GZ34/5AR4 F31 Fat Base OO Getter NOS NIB excellent testing values Balanced Made in Great Britain, carefully tested on TV-7/U at 58-58/40 min good (60=100%) no short, no gas, function flawlessly in my hifi system, matched and balanced.
Mullard Wide/Fat Base GZ34/5AR4 OO-Getter 4 Notch Blackburn England f31 1959
Date Code on Glass: f31 B9K. Labeled “HEATH By Mullard”. Made in Blackburn England. Made in November 1959 in Blackburn England. Wide Base (Fat Base). Desirable Early Made Wide (Fat) Base Tube. 4 Notch Version.
Mullard GZ34 5AR4 Vintage f31 1959 Fat Base Audio Rectifier Tube (balanced)
Audio Rectifier Tubes (5Y3, 5U4, GZ34, etc). This is a very nice f31 Mullard 5AR4/GZ34 tube with a 1959 date code of “B9B”. The minimum on our TV-7 is 40, and this one tests nicely at 55.6 and 55.4.
One, Mullard 5AR4 GZ34, fat base, dual getter, no notch, f31, 1959
“Made in Great Britain”. Firm base, excellent silvering. Tube tests at 160-160 where pass/fail is 80. This tube tests in the range of new in box Mullard 5AR4/GZ34 tubes that I have had.
(2) 1958 Mullard f31 Fat Base GZ34 5AR4 Tubes Matched Every Way (codes + test)
Matched codes, perfectly balanced, tested full NOS. Calibrated TV7-D/U test results: 59/60, 60/60. (Minimum/Good range on the TV7 is 40)