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Rat's nest of a Princeton Reverb

Discussion in 'Amp Tech Center' started by Diverted, Oct 23, 2018.

  1. galaxiex

    galaxiex Tele-Holic Silver Supporter

    Yeah.... I'm a little OCD too with stuff like this...

    Witness my first amp build/conversion of a Blues Junior...

    Yes, it's my first amp build.
    Full disclosure... I have some small experience tinkering with electronics
    and building pedals from purchased PCB boards and kits, etc.


    100_2443.jpg
     
    Diverted and theprofessor like this.
  2. schmee

    schmee Friend of Leo's

    Jun 2, 2003
    northwest
    That's what Hammond did on a lot of them. They are hell to take apart!
     
  3. galaxiex

    galaxiex Tele-Holic Silver Supporter

    That's for sure!

    I have an old solid state Silvertone constructed that way, point to point on terminal strips.

    Yuck!!!
    Hell to work on is right!

    100_2245 S.jpg

    100_2246 S.jpg
     
  4. Diverted

    Diverted Tele-Meister

    Age:
    48
    183
    Nov 11, 2016
    Bristol RI
    Nice lead dress! I like how you laid out the filter caps.
     
    Last edited: Oct 25, 2018
    galaxiex likes this.
  5. wanderin kind

    wanderin kind Tele-Meister

    Age:
    64
    281
    Apr 24, 2018
    Olympia WA
    hey, equal time for the slobs, just getting done with this channel switcher, Svetlana wing C EL34's, Partridge output transformer, RCA orange script NOS 7025's, rewound power transformer for 390 VDC B+, mixed bias, 75 ohm cathode resistor plus fixed minus supply, Fender cloth wire, ceramic tube sockets, all grounds soldered to chassis, German epoxy end capped capacitors and ceramic resistors, RMC "green top" ceramic caps, standoffs for 3 dimensional component placement (lowers stray C and feedback networks)

    rebuilt 4 times, 1) fender super reverb, no good, 2) custom Marshall circuit , no good 3) Fender 5F6 Bassman, good, but only on 10, 4) Kustom 72 Coupe Sweet!

    amp 1.JPG
    amp2.JPG
     
    Last edited: Oct 26, 2018
    ecoast and RLee77 like this.
  6. RLee77

    RLee77 Friend of Leo's

    May 15, 2016
    Silicon Valley
    That’s how most everything used to be built 50+ years ago. Like a 3D manifestation of the schematic.
     
    Snfoilhat likes this.
  7. galaxiex

    galaxiex Tele-Holic Silver Supporter

    Ya, point to point is very robust construction method.
    Prolly outlast us.
    I think Russian spaceships are built that way. :lol:
     
  8. Phrygian77

    Phrygian77 Tele-Afflicted

    Apr 30, 2016
    Crawfordville, FL
    That's one of my builds. OCD? Meh... I'm pretty much just copying blackface lead dress.
     
    RedRock likes this.
  9. Phrygian77

    Phrygian77 Tele-Afflicted

    Apr 30, 2016
    Crawfordville, FL
    I'm not a big fan of P2P. I opened up a Magnatone not long ago for a local guitarist, and I was dismayed. I wouldn't want to change an OT in one of those and try to make it look like it was original.
     
    Snfoilhat likes this.
  10. BobbyZ

    BobbyZ Doctor of Teleocity

    Jan 12, 2011
    Snellman MN
    I'm also a fan of Leo's tag board construction method. He probably did it more to speed up production than anything else but it really made the amps easier to service later on.
    That said I don't think the electrons really care if the amps true point to point, tag board or printed board. Done right they all seem to work.
     
    RedRock and Diverted like this.
  11. Diverted

    Diverted Tele-Meister

    Age:
    48
    183
    Nov 11, 2016
    Bristol RI
    I've built a few Deluxe-ish circuits true point to point, no tagboard etc. Just terminal strips and straight connections between tubes etc. I've found no issues with them as long as you're careful with respect to heater windings, input wiring etc. The tagboards are a nice less stressful alternative though!
     
    RLee77 likes this.
  12. Mike Simpson

    Mike Simpson Doctor of Teleocity Silver Supporter

    Mar 19, 2006
    Gilbert, AZ (PHX)
    Most "point to point" has a few tag boards in there somewhere...

    image3.JPG
     
    SSL9000J likes this.
  13. Diverted

    Diverted Tele-Meister

    Age:
    48
    183
    Nov 11, 2016
    Bristol RI
    Too late to turn back now ...
    Tossed the sockets, cleaned up all switches, pots etc. Want to fix some things on the board and then I'll start reassembly starting at the power supply and working my way back. Im going to get rid of the brass grounding plate and use a buss instead. This should be fun! IMG_6639.jpg IMG_6644.jpg IMG_6654.jpg
     
    Mr Ridesglide, BopT and BobbyZ like this.
  14. Diverted

    Diverted Tele-Meister

    Age:
    48
    183
    Nov 11, 2016
    Bristol RI
    Finally got around to putting the lo mein amp back together after tearing it down to bare chassis. Replaced a few caps per friend's wishes. Amp's running dead quiet now, no funky issues, ticks, oscillations etc., just solid and sounds great. Reverb's super quiet. It's got beefier transformers than stock and is running 6L6CCs biased at about 56 percent for 32w or so. That was fun! IMG_6828.JPG 2018-11-07 19-38.JPEG
     
    Mouth, galaxiex, theprofessor and 4 others like this.
  15. clintj

    clintj Friend of Leo's

    Apr 4, 2015
    Idaho
    Beautiful! What'd you do with the extra six feet of wire? ;-)
     
    theprofessor likes this.
  16. Diverted

    Diverted Tele-Meister

    Age:
    48
    183
    Nov 11, 2016
    Bristol RI
    Going to build a few new amps with it
     
    Asmith and clintj like this.
  17. Asmith

    Asmith Friend of Leo's

    Age:
    22
    Nov 27, 2014
    Morley, England
    It doesn't have to be awful although my amp is more of a tag board/tagstrip/point to point hybrid.

    WP_20181002_20_43_09_Pro.jpg

    This is my first build (I think its tidy but not ocd), I put the power supply on a tag board but could have done it with some tag strips but would provide no advantage.

    I'd love to dive into another build at the moment but its not a cheap part of the hobby.
     
    Mouth and RLee77 like this.
  18. RLee77

    RLee77 Friend of Leo's

    May 15, 2016
    Silicon Valley
    I sort of like that style, have used it before. It’s very open and flexible, easy to mod.
     
  19. theprofessor

    theprofessor Friend of Leo's

    Aug 8, 2016
    Chattanooga, TN
    Love that before and after picture. Great work!
     
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