Update : Got Chassis! Two Tubes Found At The Dump

Discussion in 'What's left to Talk About?' started by Poodlesrule, Jun 17, 2019.

  1. Poodlesrule

    Poodlesrule Well-Known Member

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    I dropped some button batteries at the dedicated shack at the dump, and there on the shelf was an old chassis, with two tubes, so I grabbed them.

    Mopers exa(?), Made in Holland, EL84_68QS5 (logo is a tube playing trumpet!)

    Gulbransen, Made in England, EX81/6CA4 (very classy typeface on brand name)

    Are them same tubes as typically found in guitar amps?

    Now that I think of it I shoulda looked at the chassis in detail...

    EDIT: Gulbransen made organs... maybe this is an amp project extracted out of an organ like we had on the forum a month ago?
     
    Last edited: Jun 17, 2019
  2. PsychoCid

    PsychoCid Well-Known Member

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    Cool!

    Bump for dump tubes.
     
  3. jtcnj

    jtcnj Well-Known Member

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    if they are el84/ 6bq5 they are tubes that are commonly used in guitar amps.
    Holland origin and bugle logo may indicate very well regarded Amperex Bugle Boy tube, but I am no expert.
     
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  4. Poodlesrule

    Poodlesrule Well-Known Member

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    Update: the Gulbransen may be radioactive...!

    Actually has a vintage-style radioactive symbol, you know, the intersecting electron paths sort of like this:

    [​IMG]
    c789bf21182963bc20ad76dc29afc645._.jpg
     
  5. jtcnj

    jtcnj Well-Known Member

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    stuck in the mud somewhere in the swamps of jersey
  6. Beyer160

    Beyer160 Well-Known Member

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    The EL84 is indeed a famed Amperex "Bugle Boy" tube, the other one is a rectifier tube. Neither are worth that much (especially since you found them at the dump), but they are indeed cool! The transformers on that hulk were probably worth picking up, too.
     
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  7. mozz

    mozz Well-Known Member Supporting Member

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    Worth more than anything new you can buy today. Organ transformers are also nice to have, much wider freq response than a guitar transformer. I'd grab the whole thing and have a marshall 18 watt build.
     
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  8. Poodlesrule

    Poodlesrule Well-Known Member

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    The dump opens at 7:30... go grab the chassis?:giggle:
     
  9. Mickey

    Mickey Gandalf the Intonationer

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    Radioactive? Have you started to glow in the dark? :)
     
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  10. stevebway

    stevebway Metaphysician & Ham

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    I know enough about electronics to feel totally lame
     
  11. Poodlesrule

    Poodlesrule Well-Known Member

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    Historically, from what I read, some tubes had Colbalt 60(?) at some point, which has a fairly fast decay characteristic.
    Older color TVs as well, which prompted better shielding?

    So, go get the chassis at the dump or not?
     
  12. jimytheassassin

    jimytheassassin Well-Known Member

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    I would grab the whole damn thing! But then again I’m starting to exceed what can be hidden from prying eyes.

    Yes I would say grab the chassis too.


    Sent from my iPhone using Tapatalk
     
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  13. mozz

    mozz Well-Known Member Supporting Member

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    Sure it's not lack of indoor plumbing?
     
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  14. Poodlesrule

    Poodlesrule Well-Known Member

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    UPDATE: I grabbed the chassis!

    Gulbransen amp, Model APS-4

    amp 1.JPG amp 2.JPG amp 3.JPG amp back.JPG
    No idea which end is which.
    Mini UPDATE: there are engraved labels: input, speaker, tremolo, 3V supply, ext control, so, betwen input and speaker we have something to work on!
    There are schematics around, and guitar forums where these beasts have been resurrected, I think.

    Now, it may be that this thing has selenium rectifier(s), a heath hazard?
     
    Last edited: Jun 20, 2019
  15. andrewsrea

    andrewsrea Well-Known Member

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    Only if you pulverize it and breath it in.
     
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  16. voodoorat

    voodoorat Well-Known Member

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    don't do that
     
  17. PsychoCid

    PsychoCid Well-Known Member

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    How else do you end a song?
     
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  18. mozz

    mozz Well-Known Member Supporting Member

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    The problem with selenium rectifiers is not any bio hazard, when they short and blow up, they stink worse than you can imagine.

    I'd just gut it and save the transformers and sockets then build something.
     
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  19. Manodano

    Manodano Well-Known Member Supporting Member

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    That looks pretty far gone, but before you gut anything, read this old post of mine. WARNING:
    These are general tips usable for a chassis in a whole lot better condition that the one pictured. In this case, those transformers look like they may have been submerged, so I'd be mighty careful checking out the power transformer. You might skip that and assume its shot. Same with the output transformer. If you don't have the trouble shooting skills, delegate the job to someone else.
    * * *​
    I've stripped or reused quite a few old console chassis like that. It's a lost art, there's not much of this stuff left. Here's some general tips for this sort of thing.
    I learned to not ravage a chassis without first looking at it carefully and trying to formulate my reuse plan. A lot of times they simply don't lend themselves to repurposing for a guitar amp - especially the ones chocked full of radio circuitry. When they do, though, you can save yourself a lot of work if you leave the key power supply elements intact. Also try to save and reuse as many of the cosmetic elements as possible.

    So, before you start cutting anything out, slow down a second. Do this first and you'll jumpstart your new project and you won't be starting your new project from scratch. Save what you can - you can upgrade whatever you want to later:

    1) First, pull all the tubes except the rectifier and measure the secondary voltages on the power transformer. While you are at it, measure the b+ voltage downstream of the rectifier and power supply filters, assuming they are intact. Are the voltages usable for a guitar circuit? Then consider the following.

    2) Study the number, pins, and layout/configuration of the sockets in place to see if this lends itself to a project. If so, leave the sockets in place. Then

    3) Leave the 120 volts wiring feeding the primary side of the power transformer in place. This way you've saved yourself installing a new wall plug, power wire, on-off switch, and fuse feeding the power transformer.

    4) Leave the rectifier and filter caps in place on the b+ circuit.

    5) Leave the filament wiring in place. Wiring filaments is a pain in the ass. The factory tech in 1962 probably had the job down better that you or I ever will. You might have to move the filament wiring to a different socket pin, but that's a lot easier than rewiring the whole thing. Also, you are likely have a pilot light in place on the filament circuit - leave it be!

    6) The terminal strips and ground lugs are super useful - leave 'em be.

    7) I leave any phono jacks or 1/4" jacks in place - sometimes they end up getting used.

    8) I'm slow to gut the pots out because most of the time they can be reused in place - and you already have the knobs for them.

    9) I try to salvage the screws and nuts and bolts that hold the chassis in the console. I use those same screws and bolts to mount the re-purposed amp wherever it ends up.

    10) I keep all the aesthetic elements that I can, so that my amp keeps its 50s or 60s tube vibe. I'll reuse the faceplate, and knobs, when possible.

    * * *​
     
    Last edited: Jun 20, 2019
  20. jimytheassassin

    jimytheassassin Well-Known Member

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    You mentioned pulling a ex81 tube (made in England) which is more likely a EZ81 by Mullard. That’s a full wave rectifier so I would doubt you have a selenium in there.

    Ya the chassis is looking a little rough on top as is the transformers, but I have a feeling this has signs of having been a mouse home. Get out the disinfectant, mask and hazmat suit Uncle Doug style.


    Sent from my iPhone using Tapatalk
     
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