"A" NOS 1964 MULLARD e88cc 6922 Special quality Mitcham made like CV2492 ecc88 6dj8 CCA Valvo print perfectly balanced and very strong, gold pins best audio tube, for EMI redd 47

Here for sale a very nice and very rare Mullard e88cc 6922 special version of ecc88 6dj8.
This is a very sought after model, the 7L1. Made in the special quality Mullard factory of Mitcham the first week of october 1964.

Tests results:  106 %   106 %  

Code 7L1 R4J1

Beautiful construction with halo getter, double stage single getter post and and gold pins.

It wears the red Valvo label

This tube is super strong and perfectly balanced, can't be better for most regarding stereo use.

One of the very best sounding e88cc type tube ever made, very realistic and highly musical, beautiful color with a nice warmth, never harsh of tiring during long immersive music session. Great for mastering gear.
Best phono stage tube, high end hifi without speaking of studio gear like EMI Redd 47.

Top condition looks like new, sold as new or very few use.

I COMBINE SHIPPING ,

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

Shipping price 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
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. ,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