Superb 1970 NOS MULLARD Blackburn ecc83 12ax7 UK I63 Valvo label, extra strong, Orange Hiwatt Marshall Vox

Here for sale a very nice and rare NOS unused Mullard 12AX7 ecc83 l63 model. It has the white Philips label.
I63 model made in 1970 England at the famous Mullard Blackburn factory, the second week of Decembre.

Code I63 B0L2

Tests results   111 % %   113 %

Ring getter, copper getter post , non copper rods.
Sounds really great, top almost new condition. Printing label and Mullard factory code are perfect, superb getter flash, extra strong, tightly balanced and well well over full specs.

Auditioning tests and tests results for noise and microphony proved to be excellent.

V1 grade.

This tube sounds excellent.

( Please note the red Mullard sleeve on photo is NOT PROVIDED with the tube but is just a help to quickly spot it's a Mullard from a glimpse, plus I thought it was nice.)

This tube is in top condition new condition. It has the Great Mullard tone.

WARM, punchy, the lovely Mullard mids.. Big sounding tube with rich and silky highs and great harmonics..
Pure British jewel.

Let your Marshall, Orange, Hiwatt or whatever get its full original tone . Hear and feel the difference.

I COMBINE SHIPPING ,

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

Shipping cost includes tracking and insurance.

This tube has been tested for

Heater filament test: Short circuit
Heater filament test: Open circuit
Heater filament test: Tolerance check
Heater cathode insulation: Leakage
Heater cathode insulation: Short Circuit
Tests for heater current abnormalities
Amplification factor
Voltage gain
Power gain
Screen grid test
Mutual conductance test
Dual test for double triodes
Emission
Inter electrode leakage
Inter electrode short circuit
Flash-over (arc detection, high voltage breakdown)
Gas ionisation test

with a first tester

and then with a second tester ( Jackson 648S ) for

Leakage

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 regularly tested for calibration.

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

Private sale so no guarantee or return please.

But if any problem ,please contact me first, a solution can always be found.

Thank you for your interest.