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Changing Circular 3 Pin Power Plug

Discussion in 'DIY' started by Luckyorleans, Jul 16, 2017.

  1. Luckyorleans

    Luckyorleans AK Subscriber Subscriber

    Messages:
    73
    Location:
    Ontario, Canada
    I bought a Music Fidelity B200 amplifier and the regular power cord has been changed to a circular female 3 pin plug. Not sure if I can just clip this off and put on a regular 3 prong plug. Any thoughts on this or how to approach it are appreciated.

    IMG_20170715_222945_992.jpg


    IMG_20170715_222935_302.jpg

    IMG_20170715_222941_617.jpg
     
  2. wlhd1610

    wlhd1610 Penny and her new friend Subscriber

    Messages:
    2,011
    Location:
    upstate new york
    Wow ,that looks like a standard xlr connector!
    Anyways,yes cut it off and install a normal plug.
    Pop the cover to make sure you get the hot wire on the right side blade of the new male plug if staying with a grounded plug.

    Bob
     
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  3. whoaru99

    whoaru99 Epic Member

    Messages:
    37,671
    Location:
    LoTL
    It appears to be a common XLR connector but they are/have been used for other things too.

    If you know the seller I suggest contacting them to ask if there are any other mods beside the plug.
     
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  4. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    31,371
    Location:
    Southern NJ
    hm, didn't know XLR were used for power.

    Replacing is easy enough, provided that was the only change. If this bypassed the internal supply and was fed from somewhere else for example, plugging it into the wall is probably going to go poorly.
     
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  5. Luckyorleans

    Luckyorleans AK Subscriber Subscriber

    Messages:
    73
    Location:
    Ontario, Canada
    Thanks for the input. Everything looks to follow the wiring correctly on the inside. Some pictures are below, am I missing anything?
    Great idea on checking for other mode but unfortunately it was a contents sale by a company so I can't contact the seller.

    IMG_20170716_125018_193Y.jpg

    IMG_20170716_125018_193C.jpg
     
  6. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    31,371
    Location:
    Southern NJ
    Without knowing a thing about this, the area where that terminal strip sits looks like it would have been home to a toroidial power transformer. Some quick google image search results come up with an amp that has a big toroid. Not totally sure if they're the same as yours but I think I'd be looking into that more carefully.

    http://www.eastelectronics.gr/wp-content/uploads/2013/12/DSC01846.jpg
     
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  7. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
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    Location:
    uk.. the middle bit
    looks like its been converted to run from an external supply .DO NOT plug into mains power . it will be a low voltage whats needed ..need to see a few more pics of inside .
     
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  8. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,719
    Location:
    uk.. the middle bit
    that xlr is actually a socket not a plug .
     
  9. dB happy

    dB happy New Member

    Messages:
    13
    The transformer is definitely missing, looks like somebody set it up for an external transformer. DO NOT plug it in. The good news is it looks like a pretty simple transformer with a single center tapped secondary. Shouldn't be hard to find one, just need the right voltage and current.
     
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  10. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,719
    Location:
    uk.. the middle bit
  11. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,719
    Location:
    uk.. the middle bit
  12. whoaru99

    whoaru99 Epic Member

    Messages:
    37,671
    Location:
    LoTL
    Hopefully this info gets to the OP before it's too late.

    I sent a PM/conversation so hopefully will see the notification.
     
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  13. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,719
    Location:
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    hope so as it will go with a flash and a bang .. recently done same with battery charger for power tools .. luckily it was just a resistor so no bang . just a flash as i put the wires into the plug hole . please dont do this at home :D
     
  14. dB happy

    dB happy New Member

    Messages:
    13
    Apparently, the transformer dies a lot in these things. Voltage is supposed to be 45v x2 which runs the main caps at max voltage. Those also fail a lot, no surprise there. I would re cap it with some 100v caps, and find a transformer out of a junker. It probably won't fit inside though, which is why it's wired for an external transformer.

    http://www.diyaudio.com/forums/solid-state/94226-musical-fidelity-b200.html
     
  15. whoaru99

    whoaru99 Epic Member

    Messages:
    37,671
    Location:
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    Antek has many toroidal transfomers to choose from, and they're quite reasonably priced.
     
  16. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,719
    Location:
    uk.. the middle bit
    maybe the outboard supply was an upgrade . up main caps to at least 60v . and any others that might be running on the edge .
    get a nice transformer and put into a box .
    may run quieter this way . :idea:
     
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  17. dB happy

    dB happy New Member

    Messages:
    13
  18. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    31,371
    Location:
    Southern NJ
    External supply probably would be quieter, and it would allow a more stout transformer if the stock one is marginal.
     
  19. Luckyorleans

    Luckyorleans AK Subscriber Subscriber

    Messages:
    73
    Location:
    Ontario, Canada
    Thanks very much everyone! Glad I posted here and decided to not do anything without getting some comments. There was a lot of equipment at the sale, including a square unmarked transformer and a power control, which I would not guess should have been bundled with this. I will e-mail the company that handled the sale and hope that the house hasn't been cleaned out yet! I have to embrace petehall347 avatar with this one!
     
  20. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    31,371
    Location:
    Southern NJ
    I don't suppose you can get in touch with the seller to see if there is a mystery box with a wall plug and a matching socket can you? Chances are more than fair that this was paired with a suitable external supply at some point.
     

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