Results 1 to 7 of 7

Thread: 9 pin socket base with metal centre

  1. #1
    Member
    Join Date
    Jun 2017
    Location
    England
    Posts
    102
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0

    9 pin socket base with metal centre

    I've just noticed that the 9 pin base I've received has a metal centre with a tab on it and as I'm going to be using a 12ax7 tube that has no pin in the centre should I leave the centre tab unconnected or does it need to be connected to something or do i need to order a socket without the shield ??

    0 Not allowed! Not allowed!

  2. #2
    Lifetime Member Enzo's Avatar
    Join Date
    May 2006
    Location
    Lansing, Michigan, USA
    Posts
    30,934
    Thumbs Up/Down
    Received: 887/5
    Given: 0/0
    Ignore it, or use it as a tie point for components.

    The center terminal used to be a lot more common than it is today. I might guess because in RF circuits like TV sets and radios, keeping component leads short mattered more than in guitar amps.

    0 Not allowed! Not allowed!
    Education is what you're left with after you have forgotten what you have learned.

  3. #3
    Member
    Join Date
    Jun 2017
    Location
    England
    Posts
    102
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Thanks enzo

    0 Not allowed! Not allowed!

  4. #4
    Senior Member
    Join Date
    Jul 2011
    Location
    Adelaide, South Oz
    Posts
    695
    Thumbs Up/Down
    Received: 20/0
    Given: 0/0
    Connect it to 0V and use it as the local star ground point. Thats what I do with these type of sockets.
    Cheers,
    Ian

    0 Not allowed! Not allowed!

  5. #5
    Member
    Join Date
    Jun 2017
    Location
    England
    Posts
    102
    Thumbs Up/Down
    Received: 0/0
    Given: 0/0
    Good idea thanks
    Scott

    0 Not allowed! Not allowed!

  6. #6
    Senior Member
    Join Date
    May 2006
    Location
    Cheshire, UK
    Posts
    1,903
    Thumbs Up/Down
    Received: 190/3
    Given: 125/0
    On EL84 amps I fit the grid stopper between the centre pin and grid pin as the 'unused' pins on an EL84 are all internal connections.

    0 Not allowed! Not allowed!

  7. #7
    Supporting Member
    Join Date
    May 2006
    Location
    Staffordshire UK
    Posts
    3,467
    Thumbs Up/Down
    Received: 143/0
    Given: 211/1
    They can make it awkward to wire heaters in accordance with Merlin’s guidance. Cutting the terminal off leaves sharp edges that might damage the insulation of wire passing over it (probably not a big deal).
    With ceramic sockets the post is part of a crimped fastener that holds the socket assembly together, so it can’t be removed, in the way that the centre posts of plastic sockets can. Don’t ask me how I discovered this.

    0 Not allowed! Not allowed!
    Last edited by pdf64; 02-11-2018 at 02:33 PM.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Where can I get this 8 pin socket + connector
    By kka in forum Maintenance, Troubleshooting & Repair
    Replies: 2
    Last Post: 06-01-2012, 06:56 AM
  2. Broken Octal Tube Socket Pin ?? HELP !!
    By crunchman in forum Maintenance, Troubleshooting & Repair
    Replies: 12
    Last Post: 03-21-2012, 03:00 PM
  3. does a non metal base plate need shielding?
    By copperheadroads in forum Pickup Makers
    Replies: 5
    Last Post: 05-22-2010, 05:45 PM
  4. Need advice on installing an 8 pin IC Socket
    By ENB in forum Maintenance, Troubleshooting & Repair
    Replies: 10
    Last Post: 10-30-2008, 09:48 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •