Advice on taming a (bright!) Princeton Reverb

Discussion in 'Amp Central Station' started by bobbyk, Aug 13, 2015.

  1. bobbyk

    bobbyk TDPRI Member

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    I bought a late 70's early 80's PR that was BF'd by a previous owner. The PR came with a 12", 16 ohm, JBL K123 speaker which I replaced with a Weber 10F50T, a speaker that I've have used successfully in Princetons in the pass. I gave the speaker a 24 hour variac break-in before installing it. I also went through the amp and while the BF work was pretty sloppy everything was as it should be value-wise.

    This amp is bright with a capital "B". With my Tele I have to keep the treble down to 3 - 4 or you get into bleeding-ear territory.

    Speaker choice? Tubes? Something else?

    Any help, suggestions, etc. would be greatly appreciated.

    Thanks in advance.
     
  2. jazzguitar

    jazzguitar Tele-Afflicted

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    Best way to shape an amp's character without modifying is a different speaker.

    I know Silverfaces tend to be much brighter than the blackfaces ...

    What about trying an Eminence Ragin Cajun ? I very much liked that in my princeton (a 1966 though) loud, clear, not too bright. No icepick.
     
  3. homesick345

    homesick345 Poster Extraordinaire

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    The Ragin Cajun seems super bright to me.

    Eminence Lil Buddy (hemp) is the warm, balanced speaker
     
  4. MilwMark

    MilwMark Doctor of Teleocity Ad Free Member

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    Are both of those 10s? Looks like OP has a 12, so Cannabis Rex is probably similar to the Lil Buddy. C-rex is a great speaker. I'm not a big fan of PRs (and tend to prefer a 10 in them) so I have no direct experience. But the C-rex did tame the harsh highs in my SFDR, without sacrificing clarity, sparkle or detail.
     
  5. homesick345

    homesick345 Poster Extraordinaire

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    OP seems to be using a 10. Anyway , it is true the C Rex is the 12 version
     
  6. MilwMark

    MilwMark Doctor of Teleocity Ad Free Member

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    Ah - I saw the JBL, and panicked.
     
  7. LKB3rd

    LKB3rd Friend of Leo's

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    Do you have the bass up? To ten even.
     
  8. bobbyk

    bobbyk TDPRI Member

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    Bass is up - to 10 even.

    I had a '65 back about 15 years ago that was just killer. (Why I EVER let that one get away....) I was hoping this would have the same vibe. In truth though that was 15 years ago and that makes my memory 15 years more hazy. I find the tone of some of the new '68 Custom DR's much more to my liking and this 'ol bedroom player was hoping that the PR would get me most of the way there.
     
  9. 63 vibroverb

    63 vibroverb Tele-Holic

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    I think a hemp cone speaker will work nicely. You could get Weber to recone that 10F150T with a hemp cone if you want. There's also Tone Tubby and the Eminence Lil Buddy.
     
  10. filmix2

    filmix2 Tele-Holic

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    TungSol 12ax7 in v1.. That smoothed out my DRRI very very well.
     
  11. canucklehead

    canucklehead Tele-Meister

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    How about the Weber 10F150H? It's a hemp cone speaker.
     
  12. Emiel

    Emiel Tele-Meister

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    Have a tech measure all of the components, preferably the caps. My '79 PR had once a leaking bass cap, causing little bass and thus hearing only high end.

    There isn't much difference between a BF and SF PR, I think the latter is a bit cleaner and bassier but it's not a huge difference.
     
  13. thebowl

    thebowl Tele-Meister

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    I think the mods leave us (me) in a position where it is hard to guess what would be the best move.

    I have personally found Tung-Sol 12Ax-7s to be very bright, so I wouldn't go in that direction.
     
  14. uriah1

    uriah1 Telefied Gold Supporter

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    I think Paisley tames his vox's with Gold 10's...

    (also try the 12ay7 swap)
     
  15. alnicopu

    alnicopu Friend of Leo's

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    Stick an eminence 12" legend in there. The 1058 was the bees knees for my PR. Good, cheap workin mans speaker.
     
  16. jwp2

    jwp2 Tele-Holic

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    The C-Rex smoothed out my twin reverb really nice. A hemp coned speaker seems to be the way to go to tame a bright amp.
     
  17. Crazy neddie

    Crazy neddie Tele-Meister

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    Why not sell it and buy a 68 CPR if you like that amp? Personally I wonder if something is wrong with it if it seems that bright?
     
  18. JD0x0

    JD0x0 Poster Extraordinaire

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    I'd have a tech look at it, if it's as bright as you say set with the treb on '3' and the bass on '10' sounds like something else might be going on. The amp might be generating harsh sounding harmonics that are hard to dial out.
     
  19. Radspin

    Radspin Friend of Leo's

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    Yeah, I'd have it looked at. That doesn't sound like any PR I've ever heard, regardless of speaker.
     
  20. bobbyk

    bobbyk TDPRI Member

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    Thanks for all the help and suggestions. I had 4-5 12AX7's in my drawer so I did some tube swapping - just to see what would happen. The first swap I made was the first tube for an old(er) 7025 that I had. Made all the difference in to world. It sounds like a PR now. Swapped back to the original tube just go make sure I wasn't crazy and God treble was back upfront again. Go figure.
     
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