Beautiful super rare NOS MULLARD GZ32 V4G Blackburn early 7R1 model rectangular getter PERFECT ! Perfectly Balanced very strong.

Happy to being able to propose you for sale a beautiful super rare NOS Mullard GZ32 V4G super early 7R1 model rectangular getter same as made in the 50's

Most sought after model, kind of GZ32 Holy grail.

Tests results  105 % and 105 %

code 7R1 B0A

It still have its nice shield label in pretty good shape and the tube is in perfect condition.

These early 7r1 model with rectangular getter and welded plate were mainly made in the mid late 50's , this one was made just at the edge of 1960 , made in January 1960 at the famous Mullard Blackburn factory.

Fully tested, super strong and perfectly balanced .  

This tube has a super , large shiny mirror like getter flashes as you can see on the photos.

Top condition. Super strong and can't be better balanced.

 Get the best of your power section.

Probably new unused, sold as new or very few use.

 No short
 No leaks  no issue                      
  I COMBINE SHIPPING ,

  SO PLEASE HAVE A LOOK AT MY OTHER ITEMS AND SAVE .

Fully tested on Jackson 648S for

Filament

Circuit

Shorts

Plate

Life test...

The Jackson 648. It is definitely one of my favorite tube testers. While it does not employ a mutual conductance test circuit, it does use an advanced emission circuit that applies separate element voltages to each tube element, and separate load circuits are also used. “These voltages and loads have been carefully selected for each tube to meet most ideally the normal operating condition of the tube.” (Source: 1950 Jackson catalog.)

In my experience, the Jackson circuitry is very effective, and often will surprise you with accuracy that approaches Hickok’s coveted “mutual conductance” test method. ( Source tubesound web site.)

I do my best to test and describe the tubes the best I can.

Note that test results may vary from one tester to an other so this must be taken as an indication, although my Jackson is regulary tested for calibration.

 Photos are part of the description you get what you see.

Thank you for your interest