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7591 power tube puzzler

John Warren

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Short of cracking open a 7591 and just looking at G2, the datasheets from all the old suppliers state that Pin 8 and Pin 4, which both make internal connections to G2, are to be externally connected via jumper for "efficient" operation of the screen.  The cold resistance between P8 and P4 is 0.2-0.3 Ohm, i.e. a short.


So that's got me curious, why the external jumper?  I can speculate it's due to the way the grid is made, two sections connected by grid wire that, when operating, develops a hot resistance large enough to sustain a potential difference between p8 and p4, a difference enough to alter the screen grid performance.


Anyone actually know?

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