6G2 chassis: The never-ending search?

Discussion in 'Shock Brother's DIY Amps' started by King Fan, Jul 10, 2019.

  1. King Fan

    King Fan Friend of Leo's Ad Free Member

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    Background: Our friend @keithb7 built a 6G2 with a Mojo chassis and noted though nice overall, it had a too-big PT cutout and (weirdly) the fuse and power cord cutouts were switched. Trying to avoid all that, I bought a correctly punched aluminum chassis that needed almost all the other holes drilled. Tedious.

    Now I may have a chance to build one for a friend. I see Mojo has stopped listing their 6G2 chassis, and although they still seem to sell it on Reverb, it still has the holes wrong.

    Then I find that nice small shop on eBay, zachmdhunter, makes a good-looking chassis. But the pictures suggest they copied all of Mojo's holes, and a question to them confirms it.

    Now, I know, Keith made a beautiful laser-cut steel adapter for his PT, and I've since learned you can mount a fuse in a double-D power cord cutout (use a star washer) *and* you can drill out a fuse hole to accept a strain relief. I forget what size hole, and the strain relief will rotate. Do-able, not elegant.

    Best solution I've seen was by @theprofessor , who used a PR chassis in his build. Elegant, spacious, and a few extra portholes for upgraded passengers...

    Does someone make a 'correct' 6G2 chassis?
     
  2. Junior Little

    Junior Little Tele-Meister

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  3. jsnwhite619

    jsnwhite619 Friend of Leo's

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    Is it cut for a bigger deluxe reverb PT? What was the adapter for?

    Sent from my XT1585 using Tapatalk
     
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  4. theprofessor

    theprofessor Friend of Leo's

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    I'd love to know if you find a dedicated 6g2 chassis with everything perfect. Of course my idea to use a PR chassis came from Jim Nickelson of Lil' Dawg, who told me that's what he does on his Choco Prince. So I was just really copying him. But, man, it worked out really, really well. Still, I'd be interested in a dedicated 6g2 chassis, so that the controls could be spaced "properly" (meaning, 6g2 properly).
     
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  5. King Fan

    King Fan Friend of Leo's Ad Free Member

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    Yes you’re right. Mojo used their DR PT, where a Champ / PR size is correct.


    Sent from my iPad using Tapatalk
     
  6. drf64

    drf64 Poster Extraordinaire Silver Supporter

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  7. jsnwhite619

    jsnwhite619 Friend of Leo's

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    If you end up just having to make do with the DR PT, stick with an 8k OT vs the 6.6k DR option and I think maybe the essence of the amp will still be there, just more of it. My last Harvard build with the 6.6k OT was radically different sounding and cleaner than anything I've done with the 8k 5e3 OT I normally use. My friend's 6g2 started with a 6.6k OT and swapped it for the Hammond 1750e after he heard my Vibrolux.
     
  8. Junior Little

    Junior Little Tele-Meister

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    Yea, I saw that after I posted and couldn't figure out how to delete my post.
    I believe he will cut a different size if you ask...worth a shot anyway.
     
  9. schmee

    schmee Poster Extraordinaire

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    The DR PT would be a good thing. Tighten things up for headroom without going too far. IMHO
     
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  10. King Fan

    King Fan Friend of Leo's Ad Free Member

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    Yeh, Mojo no doubt considered their DR PT an upgrade, and no doubt many modern builders wouldn't object to bigger iron.

    Two reasons I didn't go there: 1) Many 6G2 owners love the stock amp and its stock 125P1A has to be part of that, and 2) Many 6G2 builders are searching for that elusive schematic B+ of 315V -- the Mojo (Heyboer) 761 with its 354V HV is not going there.

    Keith, IIRC, went for the Hammond 290CAX, I went for the ClassicTone 40-18027, both of which offer a low-voltage tap at 275V.

    The guy I would build this for wants one because he heard mine, so aside from vintage-osity or schematic B+ targets, that's gonna have me running a PT that fits a 2x2.5" cutout.
     
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  11. drf64

    drf64 Poster Extraordinaire Silver Supporter

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    That's what I'm counting on. I'll drop a lower B+ Merc in there.
     
  12. Phrygian77

    Phrygian77 Tele-Afflicted

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    The Zachmdhunter chassis are exact copies of the Mojotone chassis. They've admited that to me at least in email. No objections here, all of my PR builds came from them, and I've got 2 Vibro Champ chassis from them sitting in a box. One of these days I'm going to commission them to do some custom stuff, to fix what I perceive is wrong with the Princeton Reverb chassis, add mounting holes for a DR output transformer, and circuit grounds.

    This is what I've considered doing. Although still not ideal, a custom faceplate would help.
     
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  13. King Fan

    King Fan Friend of Leo's Ad Free Member

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    Phryg reminds me, Professor, how did you solve the faceplate issue?

    Hmm. My buddy might like MM; they do say their 'FBPP' is a 125P1A clone, but do they list their B+? For that matter, do they list the cutout size or mounting centers? I know they answer email questions, but I kinda like a 'store' where things have informative labels.
     
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  14. theprofessor

    theprofessor Friend of Leo's

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    Jim Nickelson was kind enough to send me to the person who makes the face-plates for his builds. Her name is Sandy Henry, and her company is Precision Design: http://www.precisiondesignin.com/

    I simply told her that I was looking to piggy-back on Jim's Choco Prince face-plate, and for a lesser design fee (since she wasn't working from scratch), she let me tweak a few things here and there to make it my own. It fit perfectly.

    IMG_0587.JPG custom fp final.png
     
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  15. schmee

    schmee Poster Extraordinaire

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    Yeah, Sandy made this one for me years ago. They're plastic but good. (don't buy the short shank pots!)
    [​IMG]
     
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  16. Phrygian77

    Phrygian77 Tele-Afflicted

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    How thick are we talking? More than 1/16"?
     
  17. LudwigvonBirk

    LudwigvonBirk Tele-Holic

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    Kingfan, you should rig up for one-off chassis fabbing. Bending brake and some hole punching stuff and the usual bits, you'd love it. Putting ~50 precise holes in a chassis is an experience to be had.

    Bonus: Upping your metal-working and precision-measurement chops will instantly translate towards upgrading your subtle micro-climate Wasatch ski tuning requirements (which, I presume you must have)
     
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  18. theprofessor

    theprofessor Friend of Leo's

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    I just had a look at mine, but I can't measure it without pulling the chassis. I think it's 1/16" or very slightly more than that. I did not use any special pots (mine were the Mojo CTS ones). I did end up using the long thread Switchcraft jacks for the inputs, but I don't think that was absolutely necessary. If you were to use the regular-length jacks, though, the nut would be flush with the end of the threads.
     
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  19. Whoa Tele

    Whoa Tele Friend of Leo's

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    Man! This thread is not doing anything to control my desire to buy a brown Princeton. Although Jim said he could also build me a 6g6B baseman in a Wonderdawg chassis. I'd gain clean headroom but lose tha vibrato. Sorry, didn't mean to hijack.
     
  20. schmee

    schmee Poster Extraordinaire

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    Not sure,but I'm guessing just slightly more than 1/16". Sandy can tell you. I wouldnt doubt if it's metric, maybe 2mm? No...that would be about .080.. I dont think it's that thick. But if you use thick star washers on the pot, have a thick chassis, a brass back plate, etc it all adds up. The thin "star" washers would be ok I suppose.
     
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