Extremely rare NOS GE General Electric 6386 BLACK PLATE disc getter made for RCA matched pair ! for FAIRCHILD 660 670, Gates, Collins, STA level etc

Extremely rare GE General Electric 6386 black plate, disc getter matched pair ! Very sought after version.

Tests results:

Tube 1 : 93 % 102 %

Tube 2 101 % 102%

Made for RCA ( why the RCA label ) this is probably the best tubes you could offer to your FAIRCHILD 660 - 670, or Gates, Collins etc..

Sold as NOS new or very few use.

Ultra high fidelity to the source, large frequency response with just the right amount of character and harmonic richness that only these black plate can offer.

The fat, detailed and dynamic GE sound.

Hear and feel the difference of true vintage tubes.

This tube has been fully tested with ( 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.