Welcome To the 5 Pin Vacuum Tube Page

The 5 Pin has been around since the 1920's as the old 227 Globe . 

The 5 Pin design gave us for the first time an " Indirectly heated cathode"  and with it no more hum.

Examples : 36 , 44 . 24A , 38 , 35 , 49 , 485 , 27 , 76 , 56

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