Superb "A"NOS NIB SVETLANA KT88 winged C matched pair SED WINGED =C=

Here is for sale  a super rare exceptional NOS NIB SVETLANA winged =C = matched pair.
Fully tested, provided in original boxes and original foam
These are genuine old stock winged   =C=  made in St. Petersburg factory. ( Not to be confused with "S" logo modern production. )

Test results

tube 1 : 95 %                    

tube 2 : 98 %

Double dishes getters, copper post, incredible and so beautiful construction. Probably the best ever made after the almost unobtainable GEC. The winged =C= KT88 have the best possible manufacturing process, best specs and tolerance with the magic sound of the best vintage tubes.

The tubes come from the same factory, are the same model, .Same OKT61 code on the 2 tubes !!!

Label and code are intact on every tube. They all have excellent, large, mirror like getter flash

Super rare especially in that condition. They are almost new . After a first test when got them new, they've been plaid in an high end hifi device for a gentle burning time of about 1 or 2 hours during about a week prior being removed and then tested again.

So think them as being a "platinium" matched pair.

They've just been freshly tested again and show excellent tests results with a tight matching ( within 3 %)

Should I have to mention that the sound is wonderful ...
All I love , extended frequency range, huge low, all freq are clear detailed, crispy top end with lovely harmonics.

Very best KT88 for high end HIFI.

In a bass amp they sound massive with a killer tone, but can deliver the most subtle details of any kind so why they're so regarded by audiophiles and all music lovers.

In guitar amp, fat and crystal clear tone, bell like.
         
And even with low er voltage applied on cathode they have a super strong life test on Jackon 648 !!  Super robust cathode so very long lasting tubes !

Hear and feel the difference of true vintage tubes. provided in new white boxes.
 I COMBINE SHIPPING ,  SO PLEASE HAVE A LOOK AT MY OTHER INTEMS AND SAVE .

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 digital tester

and then with a second tester my trustfull 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.