Amp guts pictures

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Beer, Jan 19, 2006.

  1. Beer

    Beer Member

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    In several weeks I'll be getting an amp kit from Weber. It's 1987 clone, his number 6M45P. I know I may be jumping in feet first to the world of amplifier building with a bit too much naivity, but I like trial by fire learning experiences. He's got the schematics and layout diagrams on his site which I'll be pouring over while waiting for the kit to arrive. I picked this particular amp because I always wanted this specific amp and the complexity number on it was relatively low AND the price was very attractive.

    I was interested in looking at pictures of the guts of finished 1987 circuits. I recall seeing many people post pictures of the insides of amps but several google searches have proven fruitless.

    Also, is there a good step by step instructional book, with pictures, for building amps, specifically Marshall type amps?

    I had thought about getting the Allen amp kit for years but the price on the Weber kit was just too attractive. I've heard that Allen helps the buyer a bunch and I'll be missing out on this help.

    Thanks,

    Ted
     
  2. Greggy

    Greggy Member

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    I built the Allen Class Act II chasis from a wiring diagram only. No instructions. It depends on how detail oriented you are and how good the diagram is. The Allen diagram was outstanding. Built it right the first time, no problems. A good wiring diagram should suffice in most cases. Some "basic" electronics knowledge helps, which is about all I had to fall back on. Take your time and enjoy.
     
  3. Beer

    Beer Member

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    Well, I'm an engineer and mechanically inclined (often not necessarily true), took some electronics and electrical engineering course a decade and a half ago, solder pretty well, and can read wiring diagrams. I fear, more than anything, the specifics of certain layout techniques and general mounting arrangement of transformers and larger capacitors and switches. Also the leads that I've seen are neat on some amps and not on others and I'd like to copy the neat ones.

    Here's an example of something that would be helpful....but I'd like more.

    [​IMG]
     
  4. Kiwi

    Kiwi Silver Supporting Member

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    Ted -

    You might post this query over at the Les Paul Forum/Amplifiers page.

    I recall a guy there has/had a web site devoted to old and new Marshall amp chassis pics, layouts, and photos with the parts tagged and labeled.... including the 1987's. I've lost the site addy, but it was run by a guy named Clayton, who was/is active at the LPF/Amplifers section. I came across it when I had a 1987xl RI last year, and thought about modding it, and posted on that page.

    Good luck with it -

    Kiwi / K-wey
     
  5. Shea

    Shea Member

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  6. Beer

    Beer Member

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  7. Beer

    Beer Member

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  8. Shea

    Shea Member

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    I leared most of what I know from stuff I read on the internet and emailing people for advice, so I can't say any particular book is a "must have."

    I've looked at the first volume of Kevin O'Connor's "Ultimate Tone" series, and it's pretty dang good. But by then I had already done a lot of mods and built a handful of complete amps without it, so in my case it wasn't a "must have."

    BTW, see if "House of Jim" has some more Marshall chassis shots. Google it.

    Shea
     
  9. bob-i

    bob-i Member

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    I built a 6M45 from a Weber kit, which is about the same but the M version is more Plexi than BluesBreaker.

    [​IMG]


    And here's some closeups

    http://www.patmedia.net/bob-ingram/Luis/PICT0001.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT0002.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT00020.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT0003.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT00030.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT00050.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT0008.JPG
    http://www.patmedia.net/bob-ingram/Luis/PICT00090.JPG


    Here's how I go about building a kit.

    1) Assemble the chassis, transformers, power plugs, jacks pots etc. Test fit the boards and take them back out.
    2) wire all the AC wiring. AC input, fuse, switch, heaters.
    3) Test the AC. Use wire nuts to cap off all the transformer wires, plug in the AC and test all AC voltages, heaters, primaries (120VAC) and secondary (HVAC)
    4) Wire up the boards. place all components on the board leaving the leads at full length, just bend them over. Connect any wires, measuring from the chassis to make sure you have enough length to reach the components easily, then once this is complete solder all components and clip off the leads.
    5) Install the boards
    6) Print off a copy of the layout diagram, install the boards and wire them up. I like to attack one section at a time, for example attack a tube socket, highlight every lead you attach on the printout.
    7) Once everything is wired, print off another copy of the layout and double check your work, highlighting every lead and component you check.

    Finally read Paul Ruby's document on powering up your amp. http://paulrubyamps.com/info.html . I use the light bulb trick the first time I put the tubes in. Wire a 60 watt light bulb up in series, I got a box and light socket and wired it up in series with an extension cord. The light bulb limits the current. When you power it up, the light bulb goes bright as the caps charge, then fades. If it stays at full brightness you know there's an issue.

    If you want to learn more about the theory of operation of a simple amp, check out this document. http://195.178.239.50/ax84/media/ax84_m61.pdf

    Good luck, take your time.
     
  10. Beer

    Beer Member

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    Thanks, Bob, that's some really helpful advice and pictures. I was wondering, when soldering components and wires to the turret board, do/did you solder to the rivet separately, or have all the wires and component ends bunched up in the same spot and solder all together at once, or do you twist them in some way and then solder? I must confess that when I solder stuff in guitars I'll usually thread the wire through the connector and twist it off just a bit before soldering the loop. I have this down so it looks pretty neat. I know it's not necessary but I was wondering if something similar is done with the technique to attach all the points on the board. I've noticed that some amps/kits use these little posts at each spot that look pretty nifty. Not sure if I'd want to go that route (or what they're called or how to get them), but looking at your pictures made me wonder how the wire and caps/resistor leads are soldered together through the rivets.
     
  11. -CM-

    -CM- Something Clever Here Silver Supporting Member

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  12. Shea

    Shea Member

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  13. Beer

    Beer Member

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  14. scottosan

    scottosan Supporting Member

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    Weber's chassis/layout/filering are not exact copies of the originals, so its best to stick to his drawings.
     
  15. Beer

    Beer Member

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