Price is for two tubes. Those are made in These tubes where installed and served Swedish telecom. The tubes come with tube cards with the individual tubes service time documented. The tubes have a badge with the tube number tied to it´s collar.
The tubes have been tested and test very good, no gas or short circuits. Engraved bakelite base marked Standard Telephone & Cables with patent numbers, etched serial number on glass sphere (faint), Production estimated early 1940´s. STC was founded in 1883 in London as International Western Electric by the Western Electric Company.
Tested STRONG and MATCHED as follow:
Ia = 1.2 mA
Ia = 1.2 mA
Test under: Uf = 2.0V, Ua = 160V, Ug = -1.0V
Where 100% is Ia = 1.4mA
In case you are interested - I have some more of those in stock, although not matched.
Shipping will be DHL Express Worldwide.