Rare 1964 NOS MULLARD EZ81 6ca4 Miniwatt Dario label super strong perfect balance Vox AC15 AC10 Wem

Here is a very rare and very nice 1964 Mullard ez81 6ca4 with the green Miniwatt Dario label
Early making  with round D getter and half asymetrical plate construction. Made in Great Britain at the famous Mullard Blackburn factory in november 1964 .

Tests results:   113 % 113%  

Mullard date and factory code.  8t1 B4k5
Top conditon , super strong and perfectly balanced. Sold as very few use.
This is the perfect rectifier.
 
Real gold for a vintage Vox AC15 AC10 or to get the very best of any other amp using an ez81  6ac4 rectifier.
I COMBINE SHIPPING ,  SO PLEASE HAVE A LOOK AT MY OTHER INTEMS AND SAVE .

These tubes has been tested with a first tester 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

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 regulary 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 (never happened yet ) please contact me first.

Thank you for your interest.