cmb2001 Posted October 29, 2018 Share Posted October 29, 2018 Hi, Preface: I kind of browsed the forum but couldn't find anything matching my problem. I bought a Spider Valve HD100 Mk1 to use while my main amp is being serviced. The seller went through the paces with the amp and informed me the master volume didn't work. being as it was super loud and controllable through channel volume I still bought it. I plan on keeping it as a backup so id like to see if I can fix this issue. Issue: Master Volume sounds to be at about 7 id say compared to other 100 watt amps ive used. I can turn the knob from 0 - 10 and no change in volume, no static, zero response. The volume can be controlled by the channel volume but switching presets will blow ears out if not careful. Could this be remedied by a simple pot change or could it be something more. Looking on suggestions on troubleshooting the circuit maybe? I have some electronics experience so I know about high voltages etc going into the amp. Thanks Quote Link to comment Share on other sites More sharing options...
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