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9 Pin Tube Sockets

3/2/1999 1:19 AM
tubegirl	9 Pin Tube Sockets Excuse the amateurishness of this question, but I've often been intrigued as to what the central, often cylindrical tag on 9-pin tube sockets is for. I've never used it in the past for my 12AX7's and EL84's and things worked (though not always - but that's other issues). I've seen it used like a tagstrip for adding components directly to a socket in old amps - but I generally use PCB's (shock ! horror !) so I wouldn't know about that. Can it be used to reduce hum by connecting it to ground - (to collect stray electrons/emissions passing through envelope?? hogwash??). Only guessing.

3/2/1999 1:19 AM

tubegirl

9 Pin Tube Sockets

Excuse the amateurishness of this question, but I've often been intrigued as to what the central, often cylindrical tag on 9-pin tube sockets is for. I've never used it in the past for my 12AX7's and EL84's and things worked (though not always - but that's other issues). I've seen it used like a tagstrip for adding components directly to a socket in old amps - but I generally use PCB's (shock ! horror !) so I wouldn't know about that. Can it be used to reduce hum by connecting it to ground - (to collect stray electrons/emissions passing through envelope?? hogwash??). Only guessing.

Replies:

Dave H On the ceramic ones I use it’s part... -- 3/2/1999 3:32 AM
David You guessed it! usually connected t... -- 3/2/1999 4:44 AM
David You guessed it! usually connected t... -- 3/2/1999 4:45 AM
Dave Stork You're right... That central tag is... -- 3/2/1999 8:56 AM
Doc This center lug was used (as was po... -- 3/2/1999 1:03 PM