MULLARD GZ37 NOS BRITISH VINTAGE BRAND NEW OLD STOCK NEW IN BOX VALVE TUBE .

PLEASE NOTE: THIS LISTING IS FOR ONE VALVE, AND THERE ARE NOW THREE VALVES AVAILABLE AS ONE HAS SOLD AS PER THE PHOTOS, ALL WITH THE SAME FACTORY CODES.

BRITISH VINTAGE MULLARD GZ37 RECTIFIER VALVE WITH A WONDERFUL CLEAR WARM SOUND.

MADE IN THE MULLARD BLACKBURN FACTORY IN GREAT BRITAIN 

THE SAME MULLARD BLACKBURN " B " FACTORY CODES ARE ETCHED INTO THE GLASS OF ALL OF THE FOUR OF THE VALVES

MULLARD FACTORY DATE CODES ETCHED INTO THE GLASS OF ALL OF THE FOUR THE VALVES = 1 S I   B O D

MADE IN GREAT BRITAIN IN THE EARLY 1960'S 

BIG BROWN BASE WITH CLEAN SHINY UNUSED METAL PINS

LONG GREY ANODE PLATES

TRIPPLE MICA'S

LOWER RECTANGULAR GETTERS

ORIGINAL VINTAGE MULLARD GZ37 BOXES WITH VINTAGE BROWN TISSUE AND CARDBOARD WRAPPING

THIS TUBES TESTED AT 100% STRONG NOS READINGS ON MY B&K 747 + HICKOK TV-7 TUBE TESTERS

TESTED FOR  GAS AND  SHORTS

INTERNATIONAL AIRMAIL SHIPPING - EXCEPT TO RUSSIA AND CHINA

PLEASE SEE MY EXCELLENT E BAY CUSTOMER FEEDBACK AFTER OVER 15 YEARS OF SELLING VINTAGE VALVES ON EBAY.

PLEASE SEE MY EBAY 15 YEAR SELLING AWARD IN THE PHOTOS


Philips Holland bought and owned Mullard UK and a many other valve companies in the 1920 - 1960 period.

They then branded British made Mullard tubes with their own Philips logo. 

The British Mullard engineers etched factory codes into the glass of their British made valves,so they knew the difference.

*Pope, Valvo, Adzam, Mazda, Amperex, Bugle Boy, Mullard, Miniwatt Dario, and Radiotechnique were all names owned by Philips Holland in the 1950/1960s. 

The respective names typically referred to factories.

 For instance, Mullard operated in England. 

All of these factories may at one time or another produced tubes with various other names attached. 

Which is why we see Amperex and Mullard tubes made in Holland or Philips branded tubes made in England. 

Factory codes etched onto the glass or underneath the base of the tube help us to figure this one out.