45 tube RCA power tubes pair black plate engraved base low watt power amplifier

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Seller: Top-Rated Seller cartago_delenda_est ✉️ (1,236) 100%, Location: Verona, IT, Ships to: WORLDWIDE, Item: 265576775945 45 tube RCA power tubes pair black plate engraved base low watt power amplifier . 45 tube RCA power tubes pair black plate engraved base low watt power amplifier  two tubes type 45 made by RCA RADIOTRON black plate ribbed  mono plate hanging filament  pan getter  black engraved base  tested tv7 = 58/56 ( reference good at 47/47) also called UX-245 UX-345 VINTAGE GENUINE VACUUM TUBES TRIODE Power/Output Great tubes for "Low Watts" Amplifier with Direct Heater Triode as last stage power output 45 = 245 = CX345 = 145 = A245 = ER45 = EX645 = UX245 = PH245 = C-245 = 445 = SX245 = MX245 = 245-C = L45 = ER245 = DX245 = PA245 = AC45 = NX245 = X245 = T45 = P245 = G45 = RayX-245 = NU-45 Similat tube  Other shape (e.g. bulb type):   M45 Sub tube:   38045 ; FX245 ; VT-45 Other class quality (otherwise equal):   536A_Boonton ; CV610 First Serie Mar.1929 Saga of the Vacuumtube, Tyne page 322. 45 is the evolution of     71A   Evolution of 45 is 2A3  45spec VT-52   Socket    UX-Base 4 Pins 2 thick Filament Heater Vf 2.5 Volt / If 1.5 Ampere / Direct / Parallel, ~ = (AC/DC) According to Tyne, page 322, this audio-power output tube was introduced in March 1929. It is intermediate between UX171A and UX210 and was first named UX245, later in short 245 and 45. See other identical denominations too. The oxide-coated filament operates at 2.5 volts AC or DC, taking 1.4 amperes. The anode is of sheet nickel, carbonized to facilitate radiation. Power output about 0.8 watt. "Development was started by Westinghouse in June 1928." box 131
  • Condition: Used
  • Condition: two tubes type 45 made by RCA , black plate ribbed mono plate , hanging filament , pan getter , black engraved base , tested tv7 = 58/56 ( reference good at 47/47)
  • Brand: RCA
  • Type: Power Tubes

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