Perfect NOS early TELEFUNKEN ecc83 12ax7 long SMOOTH plate, 1 hole on plate,super strong perfectly balanced preamp tube.

Here for sale a perfect and superb NOS Telefunken ecc83 12ax7 long smooth plate, fully tested, super strong and perfectly balanced within 4 % So perfect for stereo use or as a phase inverter.

Tests results     116 %   112 %
This one has the Fisher label for US export as well as the usual ecc83 /12ax7 made In Germany inscription. A chance the super fragile ink is still readable.
This is the super rare and sought after one rectangular hole centered in the side of the plate.

Fully tested and auditioned.

Super super quiet tube and sounds glorious.

Test for sound noise and microphony all good.

Diamond logo is molded in glass not engraved...

Thick Telefunken Halo getter.

Top condition, NOS, sold as new or very few use.

( Please not the Telefunken cardboard sleeve in the back of the photo is not provided. )

THE Telefunken sound.
A real reference for audiophile , pro recording studio and some guitar player wanting a fat, warm, super super clean, musical, full bandwidth and balanced sound. All this with an extremely high fidelity to the source.

Huge dynamic range.

Great for anyone looking for high linearity response.

And a perfect choice for studio mastering tube gear, without speaking of tube mics or tube mic preamps.

Also for those looking for more linearity and a more neutral super high fidelity sound, for many the best ecc83.

These Telefunken have HUGE HEADROOM ! In the whole tube making History, Telefunken are probably the tubes that can handle the most before starting to distord. So if you need the cleanest whatever happpens, here's your tube.
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Tips*** Concerning guitar amps, these Telefunken smooth plate is one the best option as phase inverter I 've tried. It really help to preserve the integrity of your V1 and also to enhance your beloved V1 and previous stages tubes tone allowing them also to have an incredible dynamic and response under the pick.

Hear and feel the difference of tube golden age era production.

I COMBINE SHIPPING ,

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

Shipping cost includes tracking and full price 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.

Thank you for your interest.

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