1. Win a Broadcaster or one of 3 Teles! The annual Supporting Member Giveaway is on. To enter Click Here. To see all the prizes and full details Click Here. To view the thread about the giveaway Click Here.

new 5E3 build volume problem

Discussion in 'Amp Central Station' started by ouaouaron, Sep 8, 2019.

  1. ouaouaron

    ouaouaron TDPRI Member

    Posts:
    33
    Joined:
    Jun 25, 2015
    Location:
    Saint Louis
    Just finished my second amp, first was a 5F1 with no problems. this one is a 5E3 using TubeDepot circuit board. volume on amp and on guitar must be at 11 or 12 for there to be a little bit of sound out of the speaker. I tested several things and found that all four 68k (correct according to color bands) resistors are testing at 35k. Could this be the problem? How could they all be equally bad? seems like a parallel reading but it is a circuit board with each having their own separate holes. thanks
     
  2. corliss1

    corliss1 Friend of Leo's Platinum Supporter

    Posts:
    4,453
    Joined:
    Sep 13, 2008
    Location:
    Lansing, MI
    Just because they have separate holes doesn't mean they aren't still wired in parallel. Check the schematic.

    Step 1 of amp troubleshooting? A voltage chart at all tube pins.
     
  3. t-luxe

    t-luxe Tele-Afflicted

    Posts:
    1,291
    Joined:
    Nov 23, 2009
    Location:
    so. cal
    Make sure your input jacks are wired and grounded correctly.
    Check the switching jacks for proper operation as well. Are you plugging the speaker into the speaker output jack and not the ext. speaker jack?

    Get out your chopstick and lightly tap the grid pins on the preamp tube sockets starting with V1A. You should get a healthy pop. If not, check the circuit associated with that grid.
     
    Last edited: Sep 8, 2019
    wmsimpson likes this.
  4. Paul G.

    Paul G. Friend of Leo's

    Posts:
    3,409
    Joined:
    Mar 17, 2003
    Location:
    Rhode Island
    Those 68k resistors should measure as ~34k because of the way the inputs are wired, there is nothing wrong there.

    Did you check your voltages? That's the first step to diagnosing.
     
  5. SacDAve

    SacDAve Poster Extraordinaire Silver Supporter

    Age:
    69
    Posts:
    7,226
    Joined:
    Dec 23, 2009
    Location:
    Rocklin Ca.
    A big mistake I've seen in builds is the output jacks wired wrong, I seen the hot go to the ground lug.
    Output Jacks.png View attachment 637895
     
  6. RottenTheCat

    RottenTheCat Tele-Holic

    Posts:
    881
    Joined:
    May 29, 2019
    Location:
    Drambuie, Africa
    Ext speaker jack is grounding. Even grounded, you will get a little output.
     
  7. Uncle Daddy

    Uncle Daddy Tele-Afflicted

    Posts:
    1,410
    Joined:
    Sep 26, 2015
    Location:
    Maldon, England
    Check and recheck the wiring to the volume controls. I got caught with that one once.
     
  8. ouaouaron

    ouaouaron TDPRI Member

    Posts:
    33
    Joined:
    Jun 25, 2015
    Location:
    Saint Louis
    thanks everyone I will try these suggestions
     
IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.