type 53 tube Fivre power valve pair triode vintage pair for amplifier
NOS Oldest Production Fully Made in Italy during firsr 1930's
Black Plates
Black Base
Fully tested with TV7D/U tube tester military calibrated
Test results as follow
TUBE 1 = 44 / 44 ;
TUBE 2 = 40 / 48 ;
(REFERENCE GOOD ON HICKOK TV7 IS 38/38 )
oldest production made in Italy super rare
53 = CV2535 = NU-53
Socket 7-Pin-Base U7B
Filament Heater Vf 2.5 Volt / If 2 Ampere / Indirect / Parallel, ~ = (AC/DC)
Employed with Acratest 38 vintage power Amplifier with UX250 year 1932
Amplifier Webster HG-417 year 1935 also Amplifier HG-417A Webster year 1936
this is a great opportunity to get a pair of type 53 vintage vacuum tubes made in Italy for your great project do it Yourself with the great triodes type 50 for great audio performances
VERY RARE TUBES VALVES FOR PRE AMPLIFIER PREAMP DRIVER tube
box 136