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Ac 30 modification question

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  • Ac 30 modification question

    CAN an AC30 be modified to USE THE TB CHANNEL AS AN EXTRA GAIN STAGE?...IOW CAN THE AMP CURCUIT BE altered to just have 1 (ONE) CHANNEL?...I Understand that the CUT CONTROL can be parralelled with a cap (RESISTOR)?... to make IT a MASTER VOLUME CONTROL...ANY IDEAS?

  • #2
    Originally posted by barnoyle View Post
    CAN an AC30 be modified to USE THE TB CHANNEL AS AN EXTRA GAIN STAGE?...IOW CAN THE AMP CURCUIT BE altered to just have 1 (ONE) CHANNEL?...I Understand that the CUT CONTROL can be parralelled with a cap (RESISTOR)?... to make IT a MASTER VOLUME CONTROL...ANY IDEAS?
    Yeah, three.
    1. Think about getting a different amp
    2. Use a clean boost pedal
    3. See #1
    Bruce

    Mission Amps
    Denver, CO. 80022
    www.missionamps.com
    303-955-2412

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    • #3
      Interesting idea. IF I were to attempt it, I'd try something like this.

      I built a Double C amp a while back that sounded good to me. Maybe you could adapt the OD to the Vox AC30 idea.

      Double C amp - Hoffman Ampifiers Guitar Tube amp forum

      I presume this is NOT a vintage amp? IF it is, leave it original.

      With respect, Tubenit
      Attached Files

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      • #4
        Wow! Those poor cathode biased EL84s must get the crap beat out of them with all that gain!
        Bruce

        Mission Amps
        Denver, CO. 80022
        www.missionamps.com
        303-955-2412

        Comment


        • #5
          OH no...this is one of the 1st amps I built back when Doug Hoffman started his web site long ago (geez aging sucks don't it/)...anyway ...no trem.../ reverb...I got nice new "bundle" IRON from TRIODE / CHAD...GREAT TONE!...SO...skies the limit I guess...frank.

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          • #6
            it sounds really killer with my modified DOD FX86B ...AND A "MK4.23 in front of that thru the normal channel where I'm loving the 4.7 uf bypass cap...frank.

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            • #7
              Wow! Those poor cathode biased EL84s must get the crap beat out of them with all that gain!
              Well you have the "normal" clean AC30 channel going into essentially a single stage of gain (given the CF doesn't add much) that is controlled by both a trim and level pot. You could easily use a 5751, or a 12AY7 or a 12AV7 there without a problem.

              And one could simply add a PPIMV after the LTPI (if needed) and before the power amp and get reasonable and controllable gain, IMO. So then you'd have a trim, level and PPIMV to protect the poor EL84 tubes.



              With respect, Tubenit
              Attached Files

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              • #8
                I do prefer pre phaseinverter MV over POST...COOL

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                • #9
                  HOLY CRACK...just to change the subject really quik...I just added the NEW "COBALT" ERNIe BALL STRINGS TO MY PAUL...WOW!...they are sweet!...10 guage.

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