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This is an early beam or 'kinkless' tetrode and replaced the earlier PT2 pentode. PDF data sheets from the Osram 1938-39 data book are here and here. Data are given for operating two valves in quiescent push-pull. Valves were marked with one of three grade letters on the top of the bulb - V, W and X. These should be matched for QPP operation.
This page last modified by AJC on Friday, 26-Mar-2010