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VOX Westminister schematic

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  • VOX Westminister schematic

    I did some searching but can't seem to find this one...it is a bass combo from from the late 60's early 70's....there is a germanium transistor...AC187 which has the legs broken off from the body......it is obsolete and of course the recommended replacements are also obsolete.....any suggestions???
    Cheers

  • #2
    Here is the Westminister V118 schematic:
    Attached Files

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    • #3
      Thanks jazz....my biggest problem with this is trying to find a suitable replacement....I may have to use a silicon transistor which would mean changing out some resistor values....any suggestions kindly welcome...
      Last edited by bsco; 05-03-2021, 04:42 PM.

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      • #4
        Worth a shot: https://www.ebay.com/itm/20264195403...43e977dc109ae9

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        • #5
          Originally posted by Jazz P Bass View Post
          Sometimes if you contact those sellers they may have a more economical shipping option. That one is showing $55 to Canada.
          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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          • #6
            thanks guys...I doubt if the shipping will be any cheaper....I will check it out.....I think I need to register with ebay...

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            • #7
              The Westminister V118 does not use GE transistors.

              http://www.geofex.com/Article_Folders/Thomas%20Vox/Thomas%20Vox%20Replacements.pdf

              1)

              http://www.voxshowroom.com/us/amp/guardsman_power_amp_hood.html
              Thomas Vox 60 Watt RMS Power Supply/Power Amp Module

              2)

              Q6 = 2N2924 NPN predriver
              Q7 = 2N3054 NPN driver
              Q8/Q9 = 2N3055 NPN power

              3)

              http://www.voxshowroom.com/northcoast/referring/transistors.htm
              New Old Stock Replacement Transistors
              Last edited by vintagekiki; 05-03-2021, 10:00 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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              • #8
                I think the "+4.2V" on the base of Q8 is a typo. It should be 0.42V.

                Unless you are absolutely determined to go 100% authentic I would swap out the AC187 for a silicon type. You'll need to adjust the bias a little. Which one is it?
                Last edited by nickb; 05-03-2021, 09:49 PM.
                Experience is something you get, just after you really needed it.

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                • vintagekiki
                  vintagekiki commented
                  Editing a comment
                  It should be 0.42V.

              • #9
                Digikey says there are 53 of these in stock. They should be a direct cross.

                https://www.digikey.com/en/products/...SABEgLfePD_BwE
                "Yeah, well, you know, that's just, like, your opinion, man."

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                • #10
                  Originally posted by The Dude View Post
                  Digikey says there are 53 of these in stock. They should be a direct cross.

                  https://www.digikey.com/en/products/...SABEgLfePD_BwE
                  Just checked the link....keep getting an error...will try to access digi key directly....Thanks for the tip...

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                  • #11
                    Originally posted by nickb View Post
                    I think the "+4.2V" on the base of Q8 is a typo. It should be 0.42V.

                    Unless you are absolutely determined to go 100% authentic I would swap out the AC187 for a silicon type. You'll need to adjust the bias a little. Which one is it?
                    I was thinking I would have to do that....I will do some more research and see if I can find a schematic.......
                    Cheers

                    Comment


                    • #12
                      Do you think about upload photo of your bass combo?
                      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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                      • #13
                        Originally posted by vintagekiki View Post
                        Do you think about upload photo of your bass combo?
                        I will get a couple of pics and put them here....At present I am having some issues with my van...should have it taken care by lunch hour if everything goes well.....once I get over to the shop I will get some pics for you and post them this evening.....
                        Cheers

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                        • #14
                          Late 60s - 70s Vox solid state bass combo is Vox Kensington Bass and Essex Bass.
                          Vox Sovereign and Westminster is bass amp head.

                          http://www.voxshowroom.com/us/amp/index.html
                          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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                          • #15
                            Originally posted by vintagekiki View Post
                            Late 60s - 70s Vox solid state bass combo is Vox Kensington Bass and Essex Bass.
                            Vox Sovereign and Westminster is bass amp head.

                            http://www.voxshowroom.com/us/amp/index.html
                            The Vox over to the shop is a one piece combo and labeled Westminister.....I'll get a couple of pics for you.....

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