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FS: GU-48 ( 833 substitute ) transmission tubes

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VladimirK

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Joined 2007
I offer tested quad of NOS in original boxes GU-48 transmission tubes, 1972 and 1974 years of manufacturing. They have been developed as one to one substitute of 833a tubes (metal plate).
Heater voltage 10V from SMPS, 15R + 15R resistors are in parallel to heater, middle point of the resistors is grounded via 1R resistor. Current is measured on this 1R resistor. Grid voltage is 0V, grid current is less than 1mA. Plate voltages are 500V and 800V. The results are
53ma 95mA
53mA 95mA
53mA 96mA
53mA 94mA
I could also test them at higher plate voltages.
I ask 100usd per one tube. Plus shipment.
Air shipment with tracking option to USA is 40usd (up to 2kg); 54usd (up to 3kg); 68usd (up to 4kg)
 
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