RCA 6L6GC Copper Post, Bottom getter, Tall bottle, Black Plate Used

Description

These copper plate 6L6GC tubes are highly sought after today by collectors and audiophiles.  These tubes represent RCA's early development of the 6L6-GC and
are becoming harder to find. This matched pair of tubes was tested on a calibrated Hickok TV7. Tube was tested for GM (Mutual Conductance,shorts and leakage).  No shorts or leakage was found. Gm measurements are 52 where minimum is 25 micromos. Because these are power tubes,these were also tested for GAS and the tester did not sense that either tube was gassy. When testing rare tubes, I ALWAYS allow them to Idle with filament current for 10 minutes prior to taking GM measurements.
This is matched pair with identical internal structures.  This includes the dual bottom getter clear top,copper support rods and large plate structures. These are both date coded LV which equates to june of 1960.
Note:
Due to the value of these tubes, they will be shipped with purchase price insurane that is already baked into the shipping cost.  I added to cover materials and insurance.  This will cause the shipping price to seem higher than normal.
GM Measurements are as follows:
600 micromos, where minimum for a good tube is 300 micromos
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