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VOX Westminister schematic

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  • #16
    I will be grateful.
    Who does not know and knows that he does not know - teach him Confucius)
    Who knows and does not know that he knows - wake him Confucius)

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    • #17
      here is a pic for you...this is the inside of the chassis...the model number appears to be V124...
      Cheers
      Attached Files

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      • #18
        Originally posted by bsco View Post
        here is a pic for you...this is the inside of the chassis...the model number appears to be V124...
        Cheers
        V124, V1241 Kensington Bass
        http://www.voxshowroom.com/us/amp/kensington_hood.html

        https://music-electronics-forum.com/filedata/fetch?id=848609

        https://music-electronics-forum.com/forum/amplification/guitar-amps/maintenance-troubleshooting-repair/20976-vox-kensington-v1242-g-tuner?t=20442

        http://bee.mif.pg.gda.pl/ciasteczkowypotwor/%23SM_scena/VOX/

        1)

        Click image for larger version

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        V1241 Kensington is V124 Kensington with added a "G-Tuner"
        Last edited by vintagekiki; 05-05-2021, 09:01 PM. Reason: 1)
        Who does not know and knows that he does not know - teach him Confucius)
        Who knows and does not know that he knows - wake him Confucius)

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        • #19
          V124, V1241 Kensington Bass replacement parts list 1)

          2)
          865044-2 = 2N3900A (S NPN) = Q1, Q2
          865050-2 = 2N2924 (S NPN) = Q3, Q7
          865075-2 = 2N2219 (S NPN) = Q4
          865043-2 = DTG110 (G PNP) = Q5, Q6
          Attached Files
          Last edited by vintagekiki; 05-05-2021, 12:33 PM. Reason: 2)
          Who does not know and knows that he does not know - teach him Confucius)
          Who knows and does not know that he knows - wake him Confucius)

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          • #20
            Thank you sir...now I have to figure out what to do with this one.....I have to replace that AC187 with something suitable.....
            Cheers

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            • #21
              No AC187

              AC187/188 is germanium transistors.
              865075-2 or Q4 (transistor "G") is silicon transistor.

              1)
              http://www.voxshowroom.com/us/amp/v1011_hood.html
              Power Amp Driver Circuit - The driver circuit included two transistors and a driver transformer. The power amp driver transistor (Q4) was designed to increase the gain in the preamplifier audio signal. The factory replacement part number for this transistor was 86-5075-2, but Thomas often refered to this transistor simply as "G." It was housed in a TO-3 style "top hat" case. As this part is susceptible to heat related failure, Thomas added cooling fins to the transistor (see circuit board photo at top of page). The industry standard equivalent part number for this silicon transistor is 2N2219.
              Last edited by vintagekiki; 05-05-2021, 12:30 PM. Reason: 1)
              Who does not know and knows that he does not know - teach him Confucius)
              Who knows and does not know that he knows - wake him Confucius)

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              • #22
                Originally posted by vintagekiki View Post
                No AC187

                AC187/188 is germanium transistors.
                865075-2 or Q4 (transistor "G") is silicon transistor.

                1)
                http://www.voxshowroom.com/us/amp/v1011_hood.html
                Sorry but I am really confused here....there is a transistor AC187 in the V124 model......it is listed as a germanium transistor.....and it is marked as a AC187 on the side of the transistor.....are you telling me that it does not have this transistor?? because it is definately in there....can you clarify that for me please....I don't mean to be a PITA.....I just want to make sure before I do anything.....Thank you very much for the links......
                Cheers,

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                • #23
                  The picture shows that Q4 cannot be AC187
                  The AC187 was installed by some quasi-forum expert


                  Click image for larger version  Name:	fosmratxynulclhb9rv7.jpg Views:	0 Size:	123.5 KB ID:	930826 Click image for larger version  Name:	kensington_chassis_inside_12.jpg Views:	0 Size:	98.2 KB ID:	930827

                  http://www.voxshowroom.com/ct/amp/us/kensington/kensington_chassis_inside_12.jpg

                  https://images.reverb.com/image/upload/s--yJDk0QL6--/a_exif,c_limit,e_unsharp_mask:80,f_auto,fl_progressive,g _south,h_620,q_90,w_620/v1451948912/fosmratxynulclhb9rv7.jpg

                  See Kensington Bass replacement parts scan0004.pdf for transistor Q4
                  Compare schematic for power amp (Q4) and read
                  #21 note1)

                  https://music-electronics-forum.com/filedata/fetch?id=867925
                  Vox Pathfinder V1011 schematics 2)

                  https://music-electronics-forum.com/filedata/fetch?id=848609
                  Vox Kensington V124, V1241schematics 3)
                  Last edited by vintagekiki; 05-05-2021, 08:48 PM. Reason: 3)
                  Who does not know and knows that he does not know - teach him Confucius)
                  Who knows and does not know that he knows - wake him Confucius)

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                  • #24
                    Originally posted by bsco View Post
                    here is a pic for you...this is the inside of the chassis...the model number appears to be V124...
                    Cheers
                    Any chance you can trace out the schematic for posterity please? It would also help giving advise on substitutions.
                    Experience is something you get, just after you really needed it.

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                    • #25
                      Please label transistors with "factory code" and possible replacement.

                      That TO5 Driver transistor can be replaced by an easy to find TIP29 or TIP31,or some NPN TO39 case with a minimal heatsink, a thumbnail size piece of aluminum, but make certain it reaches the PCB surface and glue it there.
                      Drop of contact-neoprene cement/silicone/even hot glue but thisthe is the least reliable because bumps can separate it from non porous PCB surface, a*little* elasticity is better.

                      The AC187 was certainly some forumhead idea.

                      "Hey, old VOX used germanium, so .... "
                      Juan Manuel Fahey

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                      • #26
                        Originally posted by nickb View Post

                        Any chance you can trace out the schematic for posterity please? It would also help giving advise on substitutions.
                        I will see if I can trace out that circuit for you......J M just posted something for me.....I will check this out Tuesday and post my findings here......Thanks for all the advice everybody.....
                        Cheers

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