Schematic for Vox Cambridge 15?

Discussion in 'Amp Tech Center' started by J-bass&Tele, Sep 22, 2021.

  1. J-bass&Tele

    J-bass&Tele Tele-Meister

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    Now and then over the years I've searched for a schematic but with no luck.
    It's a V9169, made from 1999-2002 and along with it's bigger brother, the Cambridge 30, they're famous for a failing opto-coupler in the trem circuit.

    My Cambridge 15 have lost some volume capability and the trem has gone from "meh" to weak.
    I could go in and figure stuff out but would rather have a schematic to start with.
     
    Chiogtr4x likes this.
  2. Jon Snell

    Jon Snell Tele-Holic

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    Dried out capacitors will cause that if it hasn't been used in a while.
     
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  3. Chiogtr4x

    Chiogtr4x Doctor of Teleocity

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    I'm no help, just a re-purposing story:

    In 2000, I bought a used Cambridge 15 from a local shop, it was OK and I used it on gigs maybe a year ( I had 2 Fender combo amps too, but like small amps)
    - a year in, the volume got weak, the amp got really distorted and I just shelved the amp.( No attempt to repair, other than replace the 12AX7 tube, and try another speaker- dead end)

    Years later I bought a used Pathfinder 15R on CL, that for some reason had a Crate 4 ohm speaker in it ( the amp sounded great and I did not notice wrong speaker when I bought it)

    So I put the Vox/Celestion Bulldog that was in the Cambridge into the Pathfinder and have used this as my main gig amp for about 8 years.
    ( note: a buddy of mine owns a stock PF15R- we A/B'd both amps at identical settings, and I think his stock 8" may actually be louder)

    I threw out the Cambridge amp chassis ( sorry!) and just last year, a buddy of mine drilled holes in the cab/baffle to accommodate a 10" Celestion. So it's an ex. cab for the Pathfinder, BUT I actually think the Cambridge 8" speaker just sounds better and handles bass/volume just as well- so I just keep things portable
    with the 8"
    20210922_090605.jpg
     
    Last edited: Sep 22, 2021
  4. J-bass&Tele

    J-bass&Tele Tele-Meister

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    I have used it at least a couple of times per week in the years I've owned it but it's quite possible the electrolytic caps have started go bad nevertheless, it is a 20 years old amp.
    I have a bunch of big caps left from another recap project on a similar SS amp, I'll check that.
     
    Jon Snell likes this.
  5. J-bass&Tele

    J-bass&Tele Tele-Meister

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    My PF15r will fill the role nicely for now but the Cambridge sounds and feels better. The speaker could maybe be one of the reasons?
     
  6. Chiogtr4x

    Chiogtr4x Doctor of Teleocity

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    Just an old memory from when my Cambridge 15 was working :

    I'm more R&R than Rock, and ( I would not think this until getting the Pathfinder 15R, later and comparing amp tone vs. Cambridge) and I really prefer the Pathfinder's ability to give me a louder clean tone plus the Reverb ( which I turn all the way UP, and leave there), vs. an inherently more distorted/higher gain tone that came out of the Cambridge.
    The Cambridge was fun while it worked, but gave me a very distorted sizzle on everything- not quite right for my old fart music

    note: I do not use PF's Boost, but use an OD pedal always ON, at low Drive, but amp clean ( about as loud and clean as is capable)
    This almost doubles the amp's volume, and I roll from clean to dirty with my guitar Volume knob.
    * kind of amazed that the 8" speaker handles the pummeling it gets- the low end stays together- not flubby

    ( I do this with any amp these days- all small Combo amps)
     
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