How to deep clean a tube amp

Discussion in 'Fisher Forum Stickies' started by audiodon, Nov 27, 2011.

  1. Westy56

    Westy56 A symphony of paradox

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    Thanks golden___ Oops, I mean Don. ;)
     
  2. tube-a-lou

    tube-a-lou Super Member

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    Thanks Don great thread will be reading.

    Tube
     
  3. ojojunkie

    ojojunkie Active Member

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    Thanks Don! :thmbsp:

    Great reference if ever I get another tube gear in the future...:yes: :D
     
  4. Clean&Tight

    Clean&Tight Well-Known Member

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    I think it is wonderful what you are doing here (taking the time), but I would respectfully submit that one NEVER use ammonia or ammonia based products (Windex) to clean plastics.
    Most especially on well aged, well out gassed plastics.
    A one time event as you describe will in all likelihood cause no problems, and I'm not picking at your technique.
    Ammonia can have a "drying" effect on plastics; suffice it to say, without going all in to it.
    That is why it is NOT recommended for cleaning plastic eye glass lenses.
    I have had ammonia solutions cause white spots on dark plastics.
    To be safe (and it does an excellent job) use "Dawn", (obviously my favorite and I think the best) or similar, liquid dish washing soap.
    I also use "Dawn" on face plates and dial rulers.

    Thomas
     
  5. audiodon

    audiodon Addicted Member

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    Fair enough. Thanks for the feedback.
    I've made the changes.
     
    Last edited: Nov 28, 2011
  6. joel27

    joel27 Super Member

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    Thanks for the in-depth wright up.
     
    Last edited: Dec 1, 2011
  7. Clean&Tight

    Clean&Tight Well-Known Member

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    Leave the tooth brush part, absolutely! Indispensable. I used to soak knobs, but be prepared with your glue; soaking (causes no harm) but often leads to helping the old glue let go on your "brights".

    I just stand at the sink with warm water running slowly, lather them with "Dawn" and brush the Hell out of 'em.

    The first run the lather will often come up with a hint of the color of the plastic. It really did on my 500-C project.

    It's not damaging; the mild soap is removing the "dead" plastic molecules on top. You will be left with a knob that has a nice healthy luster, as new. It really is an amazing transformation. Soap 'n' Water are my best friends.

    I thought my Fisher knobs were going to just be dull, dried out shit brown, not the case.

    I did use YOUR ammonia/water ratio to clean my chassis; SUPERB outcome. Couldn't stick that chassis under the faucet and the ammonia leaves no residue. I used to use alcohols (OK results), your solution works better, cheaper and will remove organic dirt that alcohol will not.
     
  8. marloubow

    marloubow Best Day Ever Subscriber

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    Hey Don,
    Great thread and timely too.
    I recently acquired a pair of Eico HF-22 mono blocks that are totally disassembled. Everything is getting new paint.
    Your info on painting the xfmrs spurred me to paint the bells on the power xfmr black and the fins the same as the chassis' hammmered metal finish...ought to be a great look.:thmbsp:
    Thanks, as usual.

    Martin

    P.s. My 800c is playing flawlessly! :thmbsp:
     
  9. audiodon

    audiodon Addicted Member

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    Martin,
    I've been following that thread. You have courage. I haven't attempted a gut and rehab yet, but I have plans to.
     
  10. audiodon

    audiodon Addicted Member

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    I think this is close to being done.
    I plan to put the thumbnail pictures in the front and complete reassembly.
    Can anybody think of anything I've missed . . . other than reassembly, which I plan to complete? Is there something you'd like to see added or things to do differently?
     
  11. Fisherdude

    Fisherdude Regular Dude - Super Mod Super Mod Subscriber

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    Don, this is just an outstanding thread! Thanks for the time and commitment that was obviously necessary.

    It's interesting how many of your suggestions are ones that I've settled on as well! I love those little dental brushes for cleaning tube sockets. Pipe cleaners work very well for larger sockets, and I used to be able to find some that had stiff little scrubby bristles among the softer fuzz. I usually use newspaper tucked around and under transformers, but paper towels are perfect, too!

    Great job!

    Stickied!
     
    Last edited: Dec 6, 2011
  12. buglegirl

    buglegirl In The Direction Of The Singularity Subscriber

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    Hiya,

    Great how to Don. :)

    Frannie
     
  13. Rockyhill

    Rockyhill 148 State Street Subscriber

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  14. vsam

    vsam New Member

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    WOW. "Thorough" doesn't even begin to describe it! If/when I am able to get at the guts of the 500-B in our monster console, this will be printed out and ready at hand. A bit intimidating, though.... I thought I could probably do it by following along until I got to the "Chassis cleaning 2: Clean the potentiometers, rotary switches and switches" part and accompanying graphic. That's where my eyes bugged out and I thought "You touch this and it will never work again. What ARE all these parts/wires, anyway???"

    I wish I knew of someone in my neck of the woods who could be hired to do this with as much care as you showed. I'd be one very happy customer!
     
  15. audiodon

    audiodon Addicted Member

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    It's just a rats nest in there. You won't be disconnecting anything, just spraying and rotating potentiometers.
    Even with factory wiring it's messy.
    I just wanted to point out where you spray when you do it. There's an open section or two in each pot you can spray into.
     
  16. oldtexasdog

    oldtexasdog Active Member

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    I got hold of some of those Dentist files they use for a root canall:tears: and use those to clean the tube sockets.:yes:
     
  17. BinaryMike

    BinaryMike Pelagic EE Subscriber

    I've had pretty good results cleaning the inside contacts of RCA jacks with pipe cleaners. I usually fold 'em tightly to get a little extra bulk, and spray 'em with Deoxit before going in. Repeat until they come out clean. Some brands tend to leave lint behind, but that's pretty easy to deal with.
     
  18. uenjoymyself

    uenjoymyself Surrender to the flow Subscriber

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    Thanks for this post! I just picked up a 500C and this will be quite helpful!!
     
    Last edited: Feb 27, 2012
  19. Savory Good

    Savory Good New Member

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    Loved the section about waxing the faceplate. Makes the patina absolutely uniform and spotless. Waxed a Yamaha CA-610 II plate today after cleaningper your direction, and it looks like new. Fisher 440T gets waxed next time she's opened up.

    Yamaha's lettering is tougher than Mr. Fisher's. Cabinet is infinitely cheaper.

    Becoming psychotic for old audio, I am respectfully,
    Savory
     
  20. kuad

    kuad Super Member

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    Wow! Great thread!
     

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