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Help: 65 Princeton Reverb Kit Build Problem

Discussion in 'Amp Tech Center' started by trber, Dec 28, 2019.

  1. trber

    trber Tele-Meister

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    All,
    I have built my Christmas gift, but no sound. All the voltage tests have worked fine and are to spec. When I tried playing through it, however, no sound except at full volume and then, just a faint, fizzy sound. I will contact the support crew on Monday from the Kit company, but hoped to get it sorted this weekend, so I can hear the sweet sounds!

    Any help/advice would be hugely appreciated!

    Ideas?
     
  2. trber

    trber Tele-Meister

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    I should add:
    -- the speaker cable was swapped to eliminate a problem there. No luck
    --I believe all joints are soldered and OK.
    --I have checked for loose joints/connections and found none.
    --I believe all pots are correctly wired, and have checked them as well.

    I wonder if there is something I am not thinking about that could be the root cause.
     
  3. tubejockey

    tubejockey Tele-Holic

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    Pics would be helpful here.

    Do all the tubes light up? Did you double check wiring of the jacks? Start at output and do "pop tests" on each plate and grid until you get to the input.
     
  4. gaddis

    gaddis Tele-Afflicted

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    Do you have a voltmeter? If so, you need to measure the voltages at critical points in the circuit. I’m sure your kit instructions must give you information on this. If you decide to go ahead with this, please be extra careful. Amps have dangerous voltages.
     
    Wildcard_35 and trber like this.
  5. trber

    trber Tele-Meister

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    Thank for the suggestions! I will check on all mentioned, and look up a "pop test" as I am not sure what that is.

    Also, happy to provide pics, but did not want to add a bunch of irrelevant clutter. Any specific areas or just do the whole board?

    Thanks again...hoping to get this sorted out!
     
  6. trber

    trber Tele-Meister

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    Hi!
    Yes, I have checked the voltages and they are fine, according to my readings and the instructions. I could have missed something though, so will double check. I also am being very careful with the voltages...gotta go to work soon, and family waits! Thank for you advice and concern. Appreciated.
     
  7. trber

    trber Tele-Meister

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    Jack's and wiring diagram. [​IMG][​IMG]

    Sent from my SM-G955U using Tapatalk
     
  8. tubejockey

    tubejockey Tele-Holic

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    What happens if you push the plug all the way in?
     
  9. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    'pop test' means that should hear a little pop or noise through the speaker when you make contact with the plate of the tubes. For example, if you poke pin 1 of a 12AX7 with your voltmeter probe, you should hear a noise through the speaker.

    @tubejockey - that would be pretty epic if the guitar cable wasn't all the way in and that was it :D

    Do you hear any hum/buzz from the speaker at all? Even at idle there should be a hint of noise that the amp is running. If not, there's something in the output.

    Might be time to learn some more troubleshooting skills, such as making a signal tracer, to see and hear where the audio stops getting through the circuit.
     
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  10. trber

    trber Tele-Meister

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    That was just in the picture. It was all the way in for testing and nothing. I am currently looking at the speaker jacks again.

    Sent from my SM-G955U using Tapatalk
     
  11. trber

    trber Tele-Meister

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    Thanks on the pop test definition. I'll check.

    No noise at idle. All quiet.



    Sent from my SM-G955U using Tapatalk
     
  12. trber

    trber Tele-Meister

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    I was getting a pop on v1, pin 6, but nowhere else. I checked pin 1 but no pop. What might be causing that?

    Sent from my SM-G955U using Tapatalk
     
  13. BigDaddy23

    BigDaddy23 Tele-Holic

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    Do you have approprite voltage at the V1 plates (pins 1 & 6)?

    It would be good to have pics of the entire board, tube sockets, pots and output jacks. It will be something simple.
     
  14. trber

    trber Tele-Meister

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    A start...[​IMG][​IMG][​IMG]

    Sent from my SM-G955U using Tapatalk
     
  15. trber

    trber Tele-Meister

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    More... not sure if you can see what you need. [​IMG][​IMG][​IMG][​IMG]

    Sent from my SM-G955U using Tapatalk
     
  16. trber

    trber Tele-Meister

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    Back side. [​IMG][​IMG]

    Sent from my SM-G955U using Tapatalk
     
  17. trber

    trber Tele-Meister

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    I tested pins 9 and 4-5 and found 3.2 v AC.

    Sent from my SM-G955U using Tapatalk
     
  18. tubejockey

    tubejockey Tele-Holic

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    Do your pop tests from the output to input. Pop should get louder as you go. Make sure volume and tone pots are turned up, and compare your readings to the voltages on your schematic.
     
    Wally and trber like this.
  19. rolandson

    rolandson Tele-Holic Silver Supporter

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    Relax @trber ... Everything will sort itself out.

    An amp build without problems like these would create an imbalance in the universe, causing calamity of unimaginable proportions throughout space-time.

    I called a mate I regularly accompanied one day, utterly flummoxed over the sudden failure of my Strat to provide signal. I checked everything and ... nothing.

    Then his spouse picked up and suggested I try the volume knob. I told her the amp was fine and she said:

    "No, the guitar's volume knob Einstein."

    I had to think about it for a moment...then the quintessential "oh..."

    To which she replies: "I won't tell you who else had a meltdown over this very thing. I know now why Leo put knobs on those things...to convince you geniuses your guitar is broken and buy a new one."
     
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  20. trber

    trber Tele-Meister

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    I placed a red wire by the schematic where I am not getting any voltage reading on that eyelet and the next few to the right.

    The green wire on the schematic is where I am getting pops, the one to the right and left of the wire. No others pop, if that's what im supposed to be checking.

    Thanks all! [​IMG]

    Sent from my SM-G955U using Tapatalk
     
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