Yard Sale 1968 Silverface Princeton Reverb

Discussion in 'Amp Tech Center' started by bkdaaa, Feb 21, 2016.

  1. bkdaaa

    bkdaaa TDPRI Member

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    Upon initial inspection it appears mostly original except for a couple of electrolytic capacitors and the reverb tank. It does have a 5v4g rectifier tube and 5881 output tubes which don't appear correct. Since all the transformers appear to be correct any advice before first power on?
     
  2. telex76

    telex76 Doctor of Teleocity Ad Free Member

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    Should be 6V6 power tubes.
    Unless you know enough to see what kind of mods have been done to it, I wouldn't power it on.
    Whoever modded it may or may not have known what they were doing.
    At the very least I'd start with the same power up steps as used on a new build.
    You can search for threads on that subject.
     
  3. telex76

    telex76 Doctor of Teleocity Ad Free Member

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  4. Mike Simpson

    Mike Simpson Doctor of Teleocity

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    Here is a reply to my SFPR by a very knowledgeable forum member.
    If it has a 5V4 it was most likely worked on by someone that understood the differences in rectifier tubes. The tube chart may not be correct, or the best choice, depending on the transformer in the amp. Check the transformer number to verify what rectifier tube should be used. (see quote)

     
  5. BobbyZ

    BobbyZ Doctor of Teleocity

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    I definitely wouldn't run 5881s in a Princeton. The original power transformer is hanging on by a thread with stock tubes in those things.

    Oh yeah. Make sure the fuse is the right one and not an "upgrade". It's pretty easy to mistake a 3 amp fuse for the proper 1 amp fuse too.
     
  6. Coop47

    Coop47 Poster Extraordinaire

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    I agree. That's a really cool amp, well worth taking to a tech to play it safe. Congrats on the score! I'm envious.
     
  7. bkdaaa

    bkdaaa TDPRI Member

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    Thanks all

    I appreciate the input. I built a 5E3 clone and a 1w amp but that was several years ago. The lady I bought it was selling her late husband's stuff, he was a tube audiophile, coolest yard sale ive ever seen! For $75 I got the amp, all the loose tubes she had lying around, a box full of miscellaneous caps, and some other miscellaneous stuff. As for the amp, not knowing who did the work the 5881s and the 5v4g rectifier tube bothered me. All the transformer stampings match up to what I've been able to find. Someone told her to toss the original speaker as it was in another pile, I dug that out of the trashcan it seems ok. The reverb is a 2 spring Gibbs unit. I plan to trace the schematic and layout diagrams to verify all components and then decide if it's going out to a tech or not dending on what i find. I will post pix soon of my new amp.
     
  8. bkdaaa

    bkdaaa TDPRI Member

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    [​IMG]
     
  9. bkdaaa

    bkdaaa TDPRI Member

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    [​IMG]
     
  10. bkdaaa

    bkdaaa TDPRI Member

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  11. bkdaaa

    bkdaaa TDPRI Member

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  12. bkdaaa

    bkdaaa TDPRI Member

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  13. bkdaaa

    bkdaaa TDPRI Member

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  14. Mike Simpson

    Mike Simpson Doctor of Teleocity

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    Nice amp. I really like Princeton Reverbs. I gig with a 74 and have a 75 as a backup and have an 80 I will probably sell in a few monhs.
     
  15. bkdaaa

    bkdaaa TDPRI Member

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    It's rougher than the photos show, but still I think it's in very good shape for its age.
     
  16. Mhat

    Mhat Tele-Meister

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    Looks awesome.

    The power transformer looks like it may have been replaced as the wiring looks new. I see two electrolytic caps that have been replaced as well as some 'tropical fish' caps. Overall though, I'd love to have the amp.
     
  17. LeftyAl

    LeftyAl Friend of Leo's

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    $75 amazing!!! I just did a quick search and they are asking $700 and up
     
  18. bkdaaa

    bkdaaa TDPRI Member

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  19. bkdaaa

    bkdaaa TDPRI Member

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  20. bkdaaa

    bkdaaa TDPRI Member

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