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Galaxy 1000 amp arching

Discussion in 'Amplifiers' started by WHEELS, Apr 1, 2018.

  1. WHEELS

    WHEELS New Member

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    Hello all, I have a new to me Galaxy 1000 amp. I purchased it untested. For a good deal I thought. When I plug the amp in and turn it on. It lights up as it should, fan comes on , and tubes warm up. After letting it warm up for about 5 minutes. I keyed the mike. Started hearing clicking, lights in radio room dimmed, and seen blue arching inside case. Released mike turned down antenna output and turned down plate voltage. Keyed mike again same thing happened then the fuse on rear blew and I lost all power. I opened the case and looked where arching was coming from. Nothing appears burnt, but arching was definitely coming from inside the relay near rear of amp. Any help would be appreciated as my local tech only works on solid state equipment. And I've heard horror stories when it comes to shipping tube equipment. Thanks in advance.


     

  2. WHEELS

    WHEELS New Member

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    IMG_2083.JPG
     

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  3. WHEELS

    WHEELS New Member

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    I posted some pics. Hopefully they might help.
     
  4. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    Well first that comes to mind,,,Driver tube?... is blown...white flaky stuff inside glass is a dead give away to bad tube(might be others...you need to clean the crud off) and get dirt and junk out of compartment...Also something just does not look right near that Big Blue cap...need better picture that area and pics from underside of chassis...First thoughts
    All the Best
    Gary
     
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  5. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    I am seeing a "Black" mark and some crud on that Red wire near the Blue cap???
    UNPLUG that amp let set awhile take a vacuum and blow the crud out...wipe down those tubes...general cleaning is in order...Top and bottom of chassis...
    Gary
     
    #5 BJ radionut, Apr 1, 2018
    Last edited: Apr 1, 2018
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  6. WHEELS

    WHEELS New Member

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    Will do BJ radionut. Thank you
     
  7. WHEELS

    WHEELS New Member

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    Here are the pics after
     

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  8. WHEELS

    WHEELS New Member

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    Underside
     

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  9. dozerman

    dozerman hello, its me again

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    Driver tube is shot. I would bet that the dust mighta caused the arcing. Or a taller tube jumping to the hood
     
  10. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    No doubt in my mind that driver tube is toast (tube with the white junk inside)...and while your waiting for a replacement get those spider webs cleaned up on the bottom side of the chassis...looks like that was a living quarters for quite a spell.
    Make sure you replace that fuse with the correct one(most likely a 15 amp/250v...I would think.
    And hope for the best...I see a couple things I would change wiring wise but that is another issue.
    All the Best
    Gary
     
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  11. WHEELS

    WHEELS New Member

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    Thank you BJ and DOZER. It's cleaned up now . The best I can do without using chemicals.Should I look on eBay for the tube or a specific site? Also I will do some research on how to replace the driver tube. Hope you had a great Easter
     
  12. nomadradio

    nomadradio Analog Retentive

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    Time to find someone with a decent-quality tube tester.

    The tube with the milky-white appearance to the glass has lost its vacuum. You'll probably see a shiny spot on the other tubes. This is layer of metal that has a chemical affinity for gas molecules that may remain in the tube after the air is pumped out when the tube is built. Its purpose is to chemically grab any gas molecules that bump against it and remove them from the vacuum. The shiny appearance turns white when air leaks into a tube. You'll probably find a visible crack in the glass of that tube.

    The Galaxy amplifiers are hot rods. Meant to squeeze all the wattage possible out of the tubes. This tends to make them wear out or break down rapidly.

    It's possible that the one visibly-bad tube is the whole problem.

    Could be that it has other faults in it as well. There is the risk of damaging power supply components from the fault current caused by a shorted tube. If any of the other tubes have broken down, using a tester to identify them could be cheaper than using the amplifier to see if they are any good.

    73
     
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  13. WHEELS

    WHEELS New Member

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    Rodger that nomadradio! Never heard of affinity gas before. Guess I should have paid more attention in chemistry class. Lol I am going to check with my local tv repair person. If there is still any around. And also look into checking with the music instrument shops around. A lot of the amps those guys use contain tubes. So I would think they would have a tube tester. Found that out last night trying to find out info for removing tubes. I am also possibly looking into just buying all new tubes. That way hopefully starting fresh will result in less issues. I haven't a clue how long this was sitting in his garage. Thanks a bunch nomad! You can't put a price tag on knowledge bud. 73
     
  14. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    Also those 4 Blue wires going to the main bank of tubes...if all are connected would surprise me...one looks like it's hanging by a thread?...might be just the pic but???
    LIKE YOUR IMAGE reflection in the tubes Wheels...HAHA...big hands on little camera:ROFLMAO:
     

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  15. Road Squawker

    Road Squawker Sr. Member

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    FWIW, that stuff is called GETTER material
     
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