Muy Caliente VOX Pathfinder 15/15r Modification

Discussion in 'Amp Central Station' started by SnorkelMonkey, Jun 11, 2010.

  1. bluesky6

    bluesky6 TDPRI Member

    Posts:
    37
    Joined:
    Dec 28, 2013
    Location:
    SF Bay Area
    Volume mods schematic

    I figured out why I couldn't upload the schematic of my mods. Here it is.
     

    Attached Files:

  2. VOXTOTHEMAX

    VOXTOTHEMAX TDPRI Member

    Posts:
    64
    Joined:
    Jan 28, 2015
    Location:
    California
    Stuck at room temp?

     
  3. Clicky

    Clicky TDPRI Member

    Posts:
    71
    Joined:
    Feb 10, 2015
    Location:
    Gold Canyon, AZ
    I love the "volume up, boost on, gain low" sound on my stock PF--it feels and sounds a lot like a clean amp turned up really loud, but at a low volume. Will the LED mod change the character/quality of that setting?
     
  4. wabashslim

    wabashslim Tele-Afflicted

    Age:
    69
    Posts:
    1,807
    Joined:
    Nov 26, 2005
    Location:
    Sonorous Desert
    I unsoldered my LED's but wasn't crazy about the result...I just thought it sounded too "boxy" with the gain cranked, like in the Youtube vid. Although normally I hate fizzy crackly distortion, in this amp a little bit of that is an asset so I soldered a 470 ohm resistor in series with the LEDs to ground. Seems to be a fair compromise, a bit smoother but still has a good bite. Now with my Teles I can turn on the boost and get a good drie, with humbuckers I leave the boost off, with either setting the breakup begins about 2 o'clock. Any more than that comes from pedals.
     
  5. hoplite22

    hoplite22 TDPRI Member

    Posts:
    3
    Joined:
    Aug 22, 2012
    Location:
    Australia
    Hi everyone....I have an issue with my Pathfinder 15R.....

    Was purchased used, and it just arrived today....I plugged in....and bad news...

    As soon as I strum, I get a cracking noise, and then sound cuts in and out.....

    Opened her up....and everything looks fine :( Im SO disappointed :(


    If anyone here has any suggestions or solutions.....I would love to hear from you :)
     
    Last edited: Jul 9, 2015
  6. wabashslim

    wabashslim Tele-Afflicted

    Age:
    69
    Posts:
    1,807
    Joined:
    Nov 26, 2005
    Location:
    Sonorous Desert
    First thing you do, talk to the seller.
     
  7. Overwhelmed987

    Overwhelmed987 TDPRI Member

    Posts:
    6
    Joined:
    Apr 8, 2007
    Location:
    Syracuse, NY
    Bumping this thread. Norumba had the same issue that Im currently having, but I never saw him explain the fix.

    Clipped the LEDs with scissors ( :eek: )

    Now I get basically ZERO volume.

    For starters (and possibly the end of the convo lol) is fixing this something an idiot like me can do, with no experience at all on circuits?
     
  8. glpease

    glpease TDPRI Member

    Posts:
    20
    Joined:
    Sep 19, 2011
    Location:
    San Francisco
    Make sure the leftover LED leads aren't shorted together. That's the most likely culprit.
     
  9. Overwhelmed987

    Overwhelmed987 TDPRI Member

    Posts:
    6
    Joined:
    Apr 8, 2007
    Location:
    Syracuse, NY
    I have it apart again. I didnt remove the board from its housing. I clipped the leads on the LED side of the board, as opposed to undoing all the pots and unsoldering it from the backside.

    "LED2" still has the leads attached to the solder on the back, but I cut them so close to the board, I cant get anything in there to pull them out.

    "LED1" has no leads remaining. Not visible, at least.

    While I have this apart, is there a simple way to disable to trem effect? The wave on mine bleeds thru. Or the previous owner had a footswitch and just didnt turn it off last time he used it lmao
     
  10. glpease

    glpease TDPRI Member

    Posts:
    20
    Joined:
    Sep 19, 2011
    Location:
    San Francisco
    As far as the lack of sound is concerned, look very closely where you cut the leads, and you're likely to find a small short between them. Try using something to scrape the area between the cut-off leads. If not, you'll have to remove the board to work on it.

    As for the tremolo, with the depth pot at minimum, there should be no signal from the oscillator reaching the vactrol. If there is, you've got bigger problems to resolve.
     
  11. Overwhelmed987

    Overwhelmed987 TDPRI Member

    Posts:
    6
    Joined:
    Apr 8, 2007
    Location:
    Syracuse, NY
    LOL. Great. Bigger problems. EHHH. Wanted to rehouse this badboy into a head and get a small cab.

    I dont even know how you guys got the boards out without cutting wires. Ive got glue and solder stopping me from doing more than getting the pots free and just moving the board a few inches so I can see under it. One of the spots is fine. LED1. But on the back of the board where LED2 was, there is still a piece of solder and a tiny lead. Would that be an issue?
     
  12. glpease

    glpease TDPRI Member

    Posts:
    20
    Joined:
    Sep 19, 2011
    Location:
    San Francisco
    The LEDs are from signal to ground - the only way that cutting them out could cause a loss of signal is if the surgery inadvertently caused a short. If there's no evidence of a short on the top of the board, you're going to have to pull it. A couple of things, first. Use an ohmmeter to ensure there are no shorts across those cut leads. If it reads zero Ω, you've got a short. Try heating the leads from the top of the board with a soldering iron, and re-check. Beyond that, removing the board is your only choice. Yep. It's a pain, but it's your only option at that point.
     
  13. Overwhelmed987

    Overwhelmed987 TDPRI Member

    Posts:
    6
    Joined:
    Apr 8, 2007
    Location:
    Syracuse, NY
    Much appreciated sir.
     
  14. igbw

    igbw TDPRI Member

    Age:
    49
    Posts:
    11
    Joined:
    May 8, 2020
    Location:
    usa
    I recently purchased Vox 15r and it sounded great but not it cuts in and out, drop off in volume and sometimes sounds like a back chip but then I tap around light with a plastic rod of circuit board and then it comes back to life. Any ideas where to start looking for the problem at? Also I've only been able to find schematics for the Vox 15 without the reverb. Any help would be greatly appreciated.
     
  15. J-Flanders

    J-Flanders Tele-Meister

    Posts:
    177
    Joined:
    Aug 4, 2016
    Location:
    Flanders
IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.