Junk pile build - the “Champlifire”

Discussion in 'Shock Brother's DIY Amps' started by RollingBender, Jul 22, 2019.

  1. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Looking at the pile of “someday” parts the other day, I realized I had pretty much all the parts for an amp build. Sorting through, I found a smallish PT I pulled from a 1941 vintage RCA radio... it was running a pair 6V6 and a couple other octal tubes along with the rectifier tube and a magic eye tube! I try to get voltages off PT’s before I salvage them, this one was at 358-0-358 on the HT but I was able to figure out it is actually a 325-0-325 made for 110VAC so I’ll be making a bucking transformer.

    The OT is NOS I got from the retired electronics repair man across the street. It is 8 watt and multi-tapped output. I got the cap can from him too.

    Most of the other parts were scrapped from organ donors or surplus parts from other projects.
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    The chassis, I whittled from a chunk of 2” x 4”, 1/8” wall rectangle aluminum tubing. I’ve been wanting to try to do a chassis this way on my CNC.
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    It’s going into a cabinet I made a few years ago for an organ donor conversion that I’ve been looking for an excuse to re-build into something different. Here’s the cab...it sports a single 10” speaker.
    B7384653-16D6-4EAA-A8C1-FBF4C66109AE.jpeg

    And here’s the finished chassis loaded with the big/heavy parts.
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    The circuit is a AA764 Champ power section with a Matchless Spitfire preamp, hence the moniker, “Champlifire”.
     
  2. RadioFM74

    RadioFM74 Tele-Afflicted

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    Looks great! How does it sound?
     
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  3. Mudman32

    Mudman32 Tele-Meister

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    Very cool
     
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  4. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Chassis fitted to the cab...
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    I cut the eyelet board material to size tonight and now I will take some time to check the schematic and layout ten more times and program the CNC to drill the holes for the eyelets. Only 15 eyelets, 11 parts on the top of the board, 1 under board jumper and 1 above board ground jumper.
     
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  5. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Since I had room, I added 3 eyelets to mount the heaters artificial center tap to the board. I also drilled holes so that all of the jumpers will come up and over into the top of each eyelet.

    3 minutes on the mill for all the holes...
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    ...and all the eyelets installed.
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    Fancy blue Garolite from McMaster Carr.
     
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  6. Blue Bill

    Blue Bill Poster Extraordinaire Ad Free Member

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    I love it! Nice Cabinet.
     
  7. RollingBender

    RollingBender Tele-Holic Vendor Member

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  8. RollingBender

    RollingBender Tele-Holic Vendor Member

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    A little bit of black paint in the engraving and then sand smooth with a random orbital sander followed by a couple coats of lacquer to prevent tarnishing. Sure makes it easier to read and photograph.

    75645A08-93C1-4913-B7FF-73E2098559A9.jpeg
     
  9. tubeswell

    tubeswell Friend of Leo's

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    Very original. Great looking result too
     
  10. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Got it up and running! Just the sound I was after. It’s clean, sparkly, rich and less SPL than my Matchless 15 watt Spitfire clone with very similar tone.
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    Here’s a clip. Strat in bridge/middle position, volume and tone both set at “6”.
     
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  11. TheTransient

    TheTransient Tele-Holic

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    Everything about this build is cool. Salvaged parts, homemade chassis. I dig it!
     
  12. John Owen

    John Owen Tele-Afflicted Silver Supporter

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    Super cool build. Sounds great and looks great. Nicely done!
     
  13. Robear

    Robear TDPRI Member Ad Free Member

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    A build to aspire to. Thanks for sharing.
     
  14. RollingBender

    RollingBender Tele-Holic Vendor Member

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  15. El Tele Lobo

    El Tele Lobo Friend of Leo's

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    How does it sound on the edge of breakup...and fully overdriven?
     
  16. El Tele Lobo

    El Tele Lobo Friend of Leo's

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    Looks fantastic btw...and first demo sounds great! Nice work!
     
  17. RollingBender

    RollingBender Tele-Holic Vendor Member

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    It doesn’t break up!
     
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  18. RollingBender

    RollingBender Tele-Holic Vendor Member

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    Happy robot face!

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    kkphoto likes this.
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