Rare RCA 6L6GB 6L6 GB matched pair, DOUBLE RECTANGULAR GETTER, big glass, 5881 sub super strong USA made Holy grail !

Here for sale a very nice matched pair of RCA 6L6GB fully tested.
It's the sought after double rectangular square getters, big glass early model. They're getting very rare even more in perfect working order and condition. 5881 substitute.
Grey plate, double rectangular square getters, Tall glass version.  Exact same model.
test results:

tube 1     106%                      
tube 2     107 %

Perfectly matched, top condition with beautiful shinny and full getter flashes.

Super high rating, no leak, no wobble on base and passed all tests with great success.

These grey plate double square getters RCA 6l6GB are a grail of a lot of vintage Fender owners but also in the high end Hifi world. And when you play them you understand why... Sweet, full, very rich sound. These tubes have their own character but serve music with a perfect clarity and musical harmonic richness.
Hear and feel the difference of true vintage tubes.

I COMBINE SHIPPING ,

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

These tubes has been tested with 2 tubes testers

one 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.

Thank you for your interest.