Schematic Links, Tube retail links, local tube testers

Discussion in 'Tube Audio' started by outlawmws, May 15, 2005.

  1. JReinhard

    JReinhard New Member

    Messages:
    1
    Berthoud, Colorado
    Weston 981 Type 3
     

     

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  2. HiFiThor

    HiFiThor Active Member

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    211
  3. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
     
  4. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
    Hi Leejxxxxx,
    I'm over in Rocklin, off hwy 65. Just rebuilding a couple of Fishers now. ( New to Tubes ) 800c and 59A and 59T in a Futura VI Modern Walnut console.
    Just picked up a Precision Apparatus 920 tube tester, but it has 2 wires off I'm trying to find where the loose ends go. One comes off the main tube and the other off the F dial.
    Do you have any experience with Precision Apparatus? I think I have the schematic but can't quite figure these wires out and why they are off. One that is off has a ring connector.
    Anyone else on the thread have Precision apparatus 920 they can take a picture of underneath?
    Brown wire is off the Main Tube pictured( 2132 ) and the Black wire is off the F slector switch Pictured (2128) IMG_2134.JPG IMG_2126.JPG IMG_2127.JPG IMG_2132.JPG IMG_2128.JPG .
    Ken
     

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  5. LPplayer

    LPplayer AK Subscriber Subscriber

    Messages:
    209
    Seco 107 serial number 1001. Designed by my Dad, Ed Bramsen, founder of Seco in the mid 1950s, and in my possession since he passed in 1973.
     
  6. audiocarp

    audiocarp New Member

    Messages:
    20
    Location:
    Jamaica, NY, USA
    Ski Brain- Track down that schematic! Or if you can't, look up the pinout of that tube and identify which pin that brown wire is connected to. Also, does the tester work at all with these dangling wires?
     

     

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  7. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA

    Hi Audiocarp,

    Yes the tester does work with the wires discounnected. I was just afraid if I inserted a tube to test that needed that connection it might blow the tube.
    I'll see if I can get the schematic and track down the connection.
    Sorry for the late reply work went crazy on me and I had to really concentrate for a while.

    Ken
     
  8. Wharfcreek

    Wharfcreek AK Subscriber Subscriber

    Messages:
    3,541
    Location:
    Baltimore, MD
    I'm in the Baltimore, Maryland area, Pasadena to be specific (South-East side). I have a Hickok 6000A that was calibrated a few year back and works well. I'd be happy to try to accommodate the 'testing' needs of any local AK'rs...... Tom D.
     
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  9. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
    Thanks for the Offer Wharfcreek, but I'm on the other side of the US. Sacramento CA.
    I used to get out there fairly often.
    I need to get back to this stuff, but work has me going crazy and now I think I'm going to change jobs. ( more learning )
     
  10. ChrisABC

    ChrisABC New Member

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    4
  11. ChrisABC

    ChrisABC New Member

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  12. ChrisABC

    ChrisABC New Member

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  13. Scottyb451

    Scottyb451 New Member

    Messages:
    24
    Hickok 600a
    Asheville, NC

    Happy to help others verify tube status.
     
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  14. Catmanboo

    Catmanboo AK Subscriber Subscriber

    Messages:
    650
    Location:
    Atwater, ohio
    Atwater, ohio (on stark-portage co.line.),alliance,canton,hartville areas. hickok 533a with 1961 chart, sencore tc-162,knight kg-600b. Have a lot of used & nos tubes;a lot of old radio tubes, 5-6-7 pins,loctals,octals, 7&9 pin minis. Bunch of old tv tubes also, used & nos. Contact me with needs, will see what I can dig up. Functional powerstat 116bt variable autotransformer / variac with integrated DBT for awakening the dead safely.
     
    Last edited: Mar 9, 2019
  15. FrankenSLI

    FrankenSLI New Member

    Messages:
    1
    I have the exact same issue with the exact same tester. Dis you ever get to the bottom of this?

    Thanks.
     
  16. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
    I have not found this out but just started to investigate again. I just need to find my schematic as I did trace the wires back to the connected source. I did talk to an old tube guy and he said that some were left off for RFI ??? with the solder on the one and the ring on the other I have a hard time with that. ( These could easily short on something if the box was moved adn plugged back in. I'l see if I can find my schematic again and that should help. If I can look up the pictures of the origin point of the wires I'll attach them here.
     

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  17. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
    Here is the website that has the Schematic: ( Thanks to Chris Old Radios )
    http://oldradios.50webs.com/precision/
    I'll go look at it tonight and track the wires down and where they go hopefully. 1 is probably ground.
     
  18. Catmanboo

    Catmanboo AK Subscriber Subscriber

    Messages:
    650
    Location:
    Atwater, ohio
    RFI in a tube tester? I'd love to hear the back story on that!
     
  19. s-petersen

    s-petersen Scott Subscriber

    Messages:
    4,842
    Location:
    Middletown,New York
    I've heard this, that's why some testers have Ferrite beads on some of the leads. I think some tubes can self oscillate.
    It is possible the flying lead is to ground the faceplate, wedged between the faceplate and case
     
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  20. Skibrain

    Skibrain Member

    Messages:
    87
    Location:
    Rocklin CA
    I think you maybe correct on the one lead. Even though this was a while back when I pulled it open to clean it up. I think that is where the one lead was stuck.
    I really wish I could find someone with one of these to take a picture of their unit and maybe I could track down the connections. The schematics are not easy to figure out and are limited in scope. Or I have no idea how to read the one switch with 9 layers of connections on it. Help me Mr. Wizard! :)
     

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