Michael Withers Posted December 19, 2006 Report Share Posted December 19, 2006 Basically ive been donated a marshall VS100RH (which is an older AVT with a ECC83 preamp valve) from a friend who has upgraded to a better amp and its currently in a semi working state. I know the preamp valve has never been changed and I figured this and cleaning the pots would be a good start in getting it in play worthy condition. My concern when doing anything to this amp is discharging the large hi voltage capacitors that exist in the power stage of the amp. I know voltages can go upto 600v so I know I have to be careful! Does anybody know if marshalls have bleed circuit that prevent these caps retaining their lethal charge or will I have to discharge them manually before I start to do anything to this amp? Or am I being paranoid?!?! Thanks Mike Quote Link to comment Share on other sites More sharing options...
ansil Posted December 20, 2006 Report Share Posted December 20, 2006 it only has one section where it is a highvoltage amp. and thats where the tube is. one of the best things ffor that would be to turn it on and yank the cord while its on. disipates the filtercaps. for the micro current you will be dealing with on the single preamp tube i would use a nice piece of wire with aligator clips ie insulated wire and clip it on the ground clip it on the cap. and leave it there. btw what do yo umean my semi working what exactly is it doing. Quote Link to comment Share on other sites More sharing options...
Michael Withers Posted December 20, 2006 Author Report Share Posted December 20, 2006 The pots are a bit crackly when unsettled, and there isnt really volume when you turn it up. Sometimes it doesnt work atall, and ive been informed that slamming your fist down hard on the top is enough to jar it back into life! If I manage to get it fixed (one step at a time!) I would also like to modify it for extra gain as this amp has less gain then I like to play with. Also any general tips on adjusting the voicing of an amp (i know there are many many factors) would be gratefully recieved! Cheers for the advice , Thanks again Mike Quote Link to comment Share on other sites More sharing options...
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