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I have a 1990 JCM900 100w head, serial number Y24093. I know Y = 1990. What does the rest mean? Ive found nothing but Y = 1990. .  24th week? 93 made? Is there a site that deciphers the meaning of the entire serial number?

asked 16 May 2021 at 10:09 PM

Jeff McDonough
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My early 900 50 watt head is not as loud as it used to be. It has new power tubes and has been biased. What could be the issue?

asked 01 Dec 2018 at 03:44 PM

rob palumbo
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Hey, I have a Marshall JCM 900 HI Gain Dual Reverb and I want to find out the date it was made, I dont really have any reason just for funs sake but i cant understand how it works. All sites I've visited has said that it should be a sticker with a barcode but i cant find any, all I find is what I think is the serial number, the numbers are "Y41720" so if anyone know what that says or have any tips on where to find the real serial number if that isn't please let know thanks! P.s my cameras broke so I cant post any pictures but if you really need I can solve it!

asked 14 Sep 2018 at 08:18 PM

Markus Norberg
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I got a 1993 50 watt JCM 900 SL-X.  It works great except for that fact that there is no sound when FX loop is not being used.  I currently keep a cable in the loop and it plays fine.  Some people would recommend to do that any ways to improve the tone.  However, I want my amp to be in proper working condition.  Does anybody have any advice about what could be causing this?  I am not qualified to do serious amp work, but could this be something minor enough that an unskilled person can fix it on their own?

asked 11 Apr 2018 at 06:43 PM

Justin Coleman
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