50's RCA 6V6GT 6V6 GT matched pair BLACK PLATE grey shield Fender Princeton Deluxe holy grail !

Nice matched pair of 50's RCA 6V6GT in excellent top condition probably new.

The most sought after ones for Fender amps with black plate, copper rods and square getter.

Made in USA in the 50. THE absolute grail...

Test results   tube 1   101 %      

                    tube 2  104 %      

Considered by most vintage Fender owners as the best sounding 6v6gt... and those tubes last very very long ...

 
Sold as new or very few use


The tubes has been fully tested with 2 different tube testers with great success . No issue , no gaz, no shorts, no leak etc...

The pair is very strong and perfectly matched within 2 % !

I COMBINE SHIPPING ,

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

Shipping price includes full insurance and tracking

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 regularly tested for calibration.  Photos are part of the description you get what you see.