Mullard
GZ34/5AR4
4 Notch
Rectifier Vacuum Tube
Made in Blackburn England.

Label is mostly erased.

4 Notch Version.

Date code: B6J1
Made in October 1966 in Blackburn England

Fully tested by calibrated Hickok 539C tube tester
with no shorts, leakage or gas. 

Measurement:
161/164
where minimum good value is 54

Measures strong and tightly balanced.
 
I will gladly combine shipping upon request.

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The tube(s) in this sale include a 30-day satisfaction guarantee.
I strive to ensure you have a completely satisfactory purchase experience.
If you are unhappy with your purchase for any reason,
you can return the item for a full refund.

Please contact me directly prior to opening a return or leaving feedback.
I will almost always reply at least within 24 hours 
to remedy the situation for you with direct communication.