Hi, i currently have a marshall JCM800 100w 2 channel amp, (2210 model) and has worked great for a good long time. Unfortunately now it has become ill..... i had it serviced about a year ago, but its big hassle for me to take it down and pick it up etc and its not really possible these days.....
i noticed one day at practice it was getting harder and harder 2 hear... i thought it was just me, so just kept cranking it up a bit between songs..... until eventually i still cud hardly hear it and it was up full.... so then i started investigating, there was hardly any volume (but still some)and the sound was very 'gritty' i guess..... i read on the marshall website that preamp tubes can be responsible for lack of volume and tone and what not, so i borrowed my mates jcm900 for some experimentation.
i took each of my preamp valves and slotted them in2 his first preamp socket 1 at a time in the hope of finding the dodgy one.... however his amp soldiered on as before no problem with any of my preamp valves.
i tried the same thing with the EL34s and again no problem with his amps tone or volume when using my valves....
also i noticed during my experimentations that wen i flick my amp off standby (ie on), and start to play, there is no volume at all and gradually gets louder over the course of 10-20 seconds, up to a volume that isnt even near as loud as my squier practice amp and that gritty tone i mentioned before.....
have you any ideas about wat else the problem could be or how to fix it?? since it fades in i thought it mite be some kind of voltage problem? but with the high voltages involved i didnt wanna poke around the large transformers.... i also tried bridging the FX loop with a patch lead... made no difference either,....
any help greatly appreciated, and thanks in advance.... also sorry for the long post lol!
Dave
