Vox AC15CC Schematics - Get 'em here!

Discussion in 'Amp Central Station' started by robrohdeszudy, Mar 24, 2008.

  1. robrohdeszudy

    robrohdeszudy Tele-Meister

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    Hey folks,

    I have found it really frustrating that Vox doesn't make available the schematics for the Custom Classic amps. So I got brave and reverse engineered my lead player's Voc AC15CC. Here is the schematic in 4 parts with some notes. I truly hope it annoys Vox deeply.

    Best,
    --Rob

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    Board Numbers
    Main: PCB_VX15_TYPE1_1001_A
    Controls: PCB_VX15_TYPE1_1001_C

    Tube locations
    I numbered tubes arbitrarily with V1 nearest the output transformer (OT) and V4 nearest the power transformer (PT).

    Schematic conventions

    Open circles indicate off-board connections.
    • “W” numbers (wire connections) are as shown on the board.
    • “TT” numbers (turrets) are as shown on the board
    • Connector pins are numbered, so C4:1 = connector 4, pin 1
    • I think FB1 and FB2 are ferrite beads for RF shielding

    British tube designations are shown. ECC83 = 12AX7, EL84 = 6BQ5

    I have tried to show circuits in their “textbook form”, rather than as they appear on the PCB. For exampleVR7 and VR8 actually connect on the PCB. But it is at ground, so it is confusing to show them that way on the schematic.

    Resistor wattage: The 5-watt resistors I’m sure of. I assumed the smallest were 1/4w, and the larger ones were ½ and 1 watt.

    Semiconductors

    IC1 & IC2: 2147D dual voltage op amp
    1. A out; 2. A –in; 3. A +in; 4. V-; 5. B +in; 6. B –in; 7. B out; 8. V+

    IC3: 2120D operational amplifier with switch
    1. Switch control; 2. A +in; 3. A –in; 4. V-; 5. common output; 6. B –in; 7. B +in; 8. V+

    MF2: LND150

    TR1, TR2: C2910 – I assume this is a Sanyo 2SC2910, or some knockoff thereof

    Connections to main board

    W1 - V1 pin 7 [grid 1]
    W2 – V1 pin 8 [cathode 1]
    W3 – V1 pin 3 [cathode 2]
    W4 – V1 pin 6 [plate 1]
    W5 – V1 pin 1 [plate 2]
    W6 – V1 pin 2 [grid 2]
    W7 – V2 pin 7 [grid 1]
    W8 – V2 pin 3,8 [plates 1 & 2]
    W9 – V2 pin 2 [grid 2]
    W10 – V2 pin 6 [plate 1]
    W11 – V2 pin 1 [plate 2]
    W12 – V4 pin 2 [grid]
    W13 – PT pink
    W14 – PT pink
    W15 – V3 pin 3 [cathode]
    W16 – V4 pin 9 [screen]
    W17 – V3 pin 9 [screen]
    W19 – blue to HT fuse (Gnd)
    W20 – PT brown
    W21 – PT brown (Gnd)
    W22 – chassis ground
    W23 – heater (V4 pin 4)
    W24 – heater (V4 pin 5)
    W26 – V3 pin 2 [grid]
    W27 – V4 pin 3 [cathode]
    W28 – V1 pin 2 shield
    W29 – V1 pin 7 shield

    TT5 – PT purple
    TT6 – PT purple
    TT8 – pilot light red
    TT9 – pilot light black (Gnd)
    TT7 – Red to OT C.T.
     
  2. Jenix

    Jenix Tele-Holic

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    I'm not sure if I'll ever need this for my AC15 but I'm going to save it to my computer any way. This looks like it took a lot of work. Thanks a bunch, maybe one day it will come in handy.
     
  3. NewOldStock

    NewOldStock Tele-Holic

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    Here's another from the Vox R&D department. It's a 2005 print and contains only 4 valves so it would be the AC15 Custom Classic series as well.

    I edited because my pics made the thread load extremely slow-Inserted this link instead.
     
    Last edited: Mar 24, 2008
  4. jhundt

    jhundt Doctor of Teleocity

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    wow... thanks for the great work.

    seems like Vox has added about 1000 extra little components to the good old AC-15 design. More is better... right?

    It reminds me very much of how Mr Rivera "improved" the design of Fender amps by adding 500 extra parts, useless switches etc.

    I built a home-brew copy of an AC-15 back in '94. It had about 30 resistors/caps in it and sounded brilliant.

    How do these new Vox amps sound?
     
  5. aunchaki

    aunchaki Friend of Leo's

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    Do you have a schematic of that? I want to do my first amp build this year. I'd be happy to build a 5E3, but the AC-15 is my favorite. I found an AC-10 schematic online, bit nothing that looks approachable along AC-15 lines...
     
  6. NewOldStock

    NewOldStock Tele-Holic

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    It's the best sounding amp I've ever heard. Otherwise it wouldn't be sitting in my living room with my Esquire plugged into it.:D

    I'm not compromising on sound any more. My income tax refund was around $4,500 so I could've had almost anything out there. I chose the new AC15...times 2! Got the other one sitting in my work apartment about 300 miles away. It's actually a house I rent, but I wasn't going to type "my work house" in that sentence. It'd sound like I've gotten caught.:D
     
  7. Telelicious

    Telelicious Banned

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    Heres an AC15 schematic from the Webber Amp book:

    [​IMG]
     
  8. jesse v

    jesse v NEW MEMBER!

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    Thanks for these pics rob. Can anyone give me a "gain structure" of the AC15cc? For example, a Fender DR is:

    Input -> G1 -> EQ -> Volume -> G2 -> Gain -> G3 -> Master Volume -> G4 (phase inverter) -> Power Tubes

    (Everything is bold indicates a knob. G1-G4 indicates "Gain Stage #")

    Just curious because I've reading up on this stuff lately and am finding it fascinating. Hopefully I'm not hijacking a thread here. :)

    Thanks,,

    Jesse
     
  9. jjkrause84

    jjkrause84 Poster Extraordinaire

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    If you gimme some time I have an "official" schematic from Vox. I will happily send it to anyone, just drop me a PM or email
     
  10. INKOMODO.DRAGON

    INKOMODO.DRAGON TDPRI Member

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    Vox AC15C1 Schematics

    robrohdeszudy, just wanted to thank you for uploading this, it helped me a lot when I was working with my AC15C1. I've uploaded the schematics for mine on the Metroamp Forum. If any of you need them just follow this link.

    Vox AC15C1 Schematics

    Enjoy!

    P.S.: The guys at Vox should start to realize they are living in the age of free information.
     
  11. neon333

    neon333 TDPRI Member

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    Thanks!!


     
  12. INKOMODO.DRAGON

    INKOMODO.DRAGON TDPRI Member

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    You're welcome dude!
     
  13. BiggerJohn

    BiggerJohn Friend of Leo's

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    Fender DR? As in Deluxe Reverb? What master volume? What Gain control?
     
  14. dinamanu

    dinamanu TDPRI Member

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    HI any one have a TB35c1 schematics ?
     
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