1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice
Dismiss Notice
This forum does not allow a single user to have more than one username. If anyone wants to change their username contact an admin and it will be done. Multiple accounts belonging to the same member will be deleted without warning.

Golden Falcon 400 tube amp

Discussion in 'Amplifiers' started by Toltec, Jul 6, 2017.

  1. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    I think I see the red wire you're referring to. Has some black sleeve on the end, with a solid wire sticking out. Looks as if it broke off something on the circuit board with the big filter caps.



    Not sure what.

    73
     
    John Spahn likes this.

  2. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    Yes sorry forgot to say it had this on it and it is coming from the high low switch
     

    Attached Files:

  3. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    So here is my best guess.

    One end of the 10-Watt resistor is completely broken off. I think this is the solid conductor you see sticking out of the black shrink sleeve at the end of the red wire.

    The other end of the 10-ohm resistor, the end that still has a lead wire on it was soldered to the circuit board beneath the fat filter capacitors, at some spot out of the camera's view.

    73
     
  4. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    These ones
     

    Attached Files:

  5. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    I'm baffled so far. Where does the red wire lead to at the other end?

    You said "High/Low switch". The top lug, center or bottom? Does the switch have six lugs? Or just three?

    Would sure help to have a diagram. Only way you'll have one is to draw it yourself.

    73
     
  6. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    Is there a way to instantly message on this
    It's a two wire set up
    One is a yellow wire and the other is a red wire the one that goes to nothing besides the wire wound resistor
     

    Attached Files:

  7. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    I pointed a screwdriver at it
     
  8. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    The red wire that came apart from the resistor has two ends. The one that came loose from the resistor and the other end.

    The other end is attached to something. You made it seem as if that wire has something to do with the High/Low switch.

    This is the first mention of the yellow wire that I remember so far. Looks like it should lead to a switch on the front marked "SSB". Or maybe to a capacitor attached to that switch.

    Maybe.

    73
     
  9. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    Was two yellow wires that's the wrong one the other yellow goes
     
  10. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    It goes to one of the 4 tubes
     

    Attached Files:

  11. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    I really appreciate your help on this
     
  12. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    Okay, you lost me there. The pic showing the sockets of the four final tubes has no yellow wire visible.

    If you're talking about a yellow wire attached to one of the sideways pair of relays, the pic doesn't show where it's attached to the relay.

    Just not getting the big picture so far.

    73
     
    John Spahn likes this.
  13. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    This one
     

    Attached Files:

  14. nomadradio

    nomadradio Analog Retentive

    Joined:
    Apr 3, 2005
    Messages:
    3,587
    Likes Received:
    4,039
    That yellow wire is connected to pins 5 and 9 of the tube socket, looks like.

    If so, this will be a negative DC grid-bias voltage from the power supply. Typically between 8 and 10 Volts. But how the power supply produces this negative DC voltage is a whole 'nother question.

    73
     
    John Spahn likes this.
  15. John Spahn

    John Spahn New Member

    Joined:
    Aug 30, 2019
    Messages:
    26
    Likes Received:
    0
    That wire is going to the switch that has the broken wire wound resistor on it that I have no clue to where it goes do you know where I can get a diagram for this at
     

Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!