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Princeton Reverb Build #3

Discussion in 'Shock Brother's DIY Amps' started by Phrygian77, Jun 26, 2019.

  1. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    Here we go on my 3rd PR build. I wanted to duplicate most of what I did in my last build, and provide some additional details.

    This is a Zachmdhunter chassis from eBay, which is basically a copy of the Mojotone Princeton Reverb chassis. I really need to create a template for these grounds. It's a pain every time making sure that that an 8-32 nut plus a socket will clear the power transformer, the chassis, and everything else.

    Screenshot.png


    Main circuit ground here applies to just the power amp grounds.

    Next up, the OT mounting holes for a Deluxe Reverb transformer. I have a template for this.

    Screenshot (1).png


    Template for the bright and raw switch pilot holes.

    IMAG0141.jpg IMAG0140.jpg


    Bright and raw switch pilot holes....

    IMAG0145.jpg IMAG0144.jpg


    Drilled to 1/4"....

    IMAG0167.jpg IMAG0166 (2).jpg


    The cap can clamp won't work out by default, so you need to mod the clamp or the chassis. Filing the mounting centers outwards helps.


    Screenshot (2).png


    Test fitting the OT to make sure sure it clears the speaker...

    IMAG0171.jpg
     
    Last edited: Jun 26, 2019
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  2. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    Cabinet prep... Fender secured the reverb tank bag with 3/4" #6 oval head screws and #10 washers. Cable clamps were always secured with #10 3/4" flat head wood screws.

    IMAG0125.jpg IMAG0132.jpg IMAG0131 (2).jpg IMAG0127 (1).jpg IMAG0126.jpg
     
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  3. EddieLocrian

    EddieLocrian Tele-Afflicted

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    Sweet.
    Attention to detail.
     
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  4. Les Gear

    Les Gear TDPRI Member

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    Pic of PrincePro #1 -- Consider shifting your OT a bit:

    [​IMG]


    Pic PrincePro #2 -- Consider ditching the cap can. There's no point building separate ground paths while having everything join a unitary ground inside the can:

    [​IMG]


    Have fun . . .
     
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  5. theprofessor

    theprofessor Poster Extraordinaire

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    Subscribed! I LOVE Princeton Reverbs. I built one for a friend but don't have one myself. Can't wait to see your third one come together.
     
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  6. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    The OT has been shifted slightly. To clear one of the nuts for securing the board. I wish the chassis maker would make those holes 9/64 instead of 11/64, and I could just use 8-32 swageform screws to secure the board, and leave out the 8/32 Keps nuts.

    I personally like the cheap JJ 40-20-20-20 can cap. It fits the chassis, and I've had ZERO issues with noise in these builds.
     
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  7. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    This is the last time I do this on this old table saw...

    IMAG0177.jpg
     
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  8. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    IMAG0179.jpg IMAG0180.jpg IMAG0183.jpg
     
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  9. lowatter

    lowatter Tele-Meister

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    Great looking build P77. I'm 59 and when I retire *8 STINKING YEARS FROM NOW!* methinks that I may produce one amp and one electric guitar per month of my own design for sale to supplement my retirement. I tweaked a 1974X circuit that I'm EXTREMELY happy with and I'm leaning towards a 12" Leoish version of a lowatt(see what I did there?) reverb amp for Fendery tones. I'll be looking hard at the Princeton circuit but I want to simplify it as much as possible to keep it easier to produce using a tagboard and a simple tonestack etc. Any suggestions would be appreciated.
    Love what you doing here and I hope to hear examples. Carry-on.
     
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  10. schmee

    schmee Doctor of Teleocity

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    Yes, I have used just filters and terminal strips and it works great with a normal size PR board (why build one, aren't they like $9?) The terminal strips allow soldering of the resistors nicely. Like this, they fit in that space fine. (This is just a mock up!)
    [​IMG]
     
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  11. tubedood

    tubedood Tele-Holic

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    Looking great Phyrgian77! Nice build for sure!

    I am wrapping up a lil 5F2-A build and thinking about a Princeton type amp next. This is inspiring!

    Dale
     
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  12. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    I don't normally do this on the floor in the back bedroom, but my old lady had already gone to bed, so I couldn't be banging on stuff in the garage ... lol!

    I feel like I could do this in my sleep at this point.

    IMAG0186.jpg IMAG0188.jpg


    I've been wanting to do a 5F2A with a 10 or a 12 for a long time, but I've got a long line of projects to work on. Next up, after I finish this Princeton Reverb (and finish my 1967 Super Reverb restoration), is a couple of Vibro Champs (I've got 2 chassis and 9 faceplates lol!). I also have nearly everything to build a 1962 brownface Super, and a quad 6V6 Marshall Super Lead (could also run 2x EL34), not to mention that I've got a chassis for a Trainwreck build (probably going to go with the Rocket, since I've been jonesing for a tweeked AC30 type amp).

    Edit: At some point, I'm also going to build a Sunn 100s head for my bass player.
     
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  13. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    This is exactly what I want to do full time when I retire 10-15 years from now. The problem is that I've already attracted a lot of local attention, so right now I've got this Pinceton Reverb build plus a 1965 Deluxe Reverb that I'm working on.
     
  14. JohnnyCrash

    JohnnyCrash Doctor of Teleocity

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    I just recently built a 40 watt 6L6 Super Reverb type circuit into a Princeton chassis and cab, so this is giving me flashbacks :D

    I put my raw switch on a 1m pull-pot I used for the Volume control and a pull-switch on the Treble knob for the Bright switch. I was building a larger amp into smaller real estate, though.

    A lot of people don’t like pull-switch pots though, they can feel cheap.

    Looks classier with the small toggles.

    Cool stuff!
     
  15. LudwigvonBirk

    LudwigvonBirk Tele-Holic

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    Alt plan idea: Ditch the stupid job, follow your bliss, and do it now! :)!
     
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  16. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    Bias board done...

    IMAG0202.jpg

    Man, I wish. It's hard to give up an almost 70k salary with practically free heathcare, at least in this area. I could be making more, doing what I do in I.T. in the bigger cities. Just 10 more years, and I can think about it.
     
  17. tvas22

    tvas22 Tele-Meister

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    I used a push-push pot on a recent build and I wish I’d used a switch. It does indeed feel really cheap....
     
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  18. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    The two piece 1.5" cap can clamp fits the mounting centers on this chassis. AES or Amplified Parts sells this one. The one piece version that I've used in past does not (you have to file the mounting centers out). The latter is what Hoffman, Tubedepot, and Mojotone sell (surprising, because this is supposed to be a copy of the Mojotone PR chassis).

    IMAG0203.jpg
     
  19. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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  20. Phrygian77

    Phrygian77 Friend of Leo's Gold Supporter

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    Well, I forgot I can't put the OT on until I have the main eyelet board mounted.

    Here's the easy way to do the input jacks. No reason to torture yourself trying to do this inside the chassis...

    IMAG0216.jpg
     
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