Brand: PUROTRON RAGA AG ZURICH
Manufacturer and factory: RCA Philadelfia (PROBABLY)
Year of production: 1950's
Rating : 1
Original package : yes
Mutual Conductance uMhos : GM 6100 uMohs 6150 uMohs
Very rare 2A3 marketed by the Swiss company Purotron. Production is a mystery. Apparently it would appear RCA but the upper mica and the filament support springs and the CUP getter are slightly different from all the RCA productions that have found to me so far. Compared to other US manufacturers, they always differ in some details.
What is certain is that the performance detected is superlative as well as the perfect GM and well beyond the maximum specifications we have the same top performance for anodic emission that stands for both over 70 mA.
They are absolutely new because I opened the sealed package for the test
A collectible couple
PRICE FOR A PERFECT MATCHED PAIR
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