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The GU-43B tetrode for wideband power amplification at frequencies up to 100 MHz in RF equipment. This tube is generally considered analogous to the 4CX1000. 
                                                                     QTY-1
                                NIB  NOS    
     
GENERAL
Cathode:  indirectly heated, oxide-coated.
Envelope:  metal-to-glass.
Cooling:  100 m3/hour forced air.
Height, mm, at most:125
Diameter, mm, at most:101
Mass, Kg, at most:1.5







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