Members Unreachable Posted September 10, 2009 Members Share Posted September 10, 2009 I bought my friends JCM 900 4501 with a vintage 30. I've been playing my board through it and all my pedals sound fine except my dirt pedals. My settings for the clean channel are: Pre-Amp: 4 o'clock, EQ is set to my taste, and the master volume is at about 9 o'clock. The problem is that when I start to move the pre-amp volume up and play with a dirt pedal the sound will almost get muffled. It's hard to explain, but it doesn't sound right. If you put the pre-amp level below 4 o'clock it sounds fine with a dirt or distortion pedal, but any higher and you'll get that muffled ugly sound. I was thinking about changing the tubes, but I wanted to know if this was the source to the problem or if it isn't a problem at all and just the way the amp was designed. Link to comment Share on other sites More sharing options...
Members smellyalbatross Posted September 10, 2009 Members Share Posted September 10, 2009 I had this exact think on my 4100 and I seem to remember the tech found a burnt cap? Man I hope I remember right and I am pointing you I. The right direction, but I am pretty sure it was a cap. Took two techs to find it, but when he did it took him 30 seconds to fix. Link to comment Share on other sites More sharing options...
Members madryan Posted September 10, 2009 Members Share Posted September 10, 2009 The JCM 900's used diodes in the tone stack as well so you might be overloading one of them. Unlike tubes which sound great when hit with a really hot input signal diodes often don't. Link to comment Share on other sites More sharing options...
Members Unreachable Posted September 11, 2009 Author Members Share Posted September 11, 2009 The JCM 900's used diodes in the tone stack as well so you might be overloading one of them. Unlike tubes which sound great when hit with a really hot input signal diodes often don't. I don't know much about amps, but does that mean it's using solid-state technology to emulate the tube distortion? PS: It sounds kinda like if you had a solid-state amp on distortion then you turn on your dirt pedals and play. Link to comment Share on other sites More sharing options...
Members pioneerprogress Posted September 11, 2009 Members Share Posted September 11, 2009 I don't know much about amps, but does that mean it's using solid-state technology to emulate the tube distortion? PS: It sounds kinda like if you had a solid-state amp on distortion then you turn on your dirt pedals and play. Bingo. Link to comment Share on other sites More sharing options...
Members Unreachable Posted September 11, 2009 Author Members Share Posted September 11, 2009 Bingo. Hmmmm. I was thinking of trading this for a YCV40 and keeping the Vintage 30 and swapping the speaker on the Traynor. Does the YCV40 run on the tubes or with some diode clipping? Link to comment Share on other sites More sharing options...
Members Unreachable Posted September 11, 2009 Author Members Share Posted September 11, 2009 bump, also, does the YCV40/50 use diodes or does it use the tubes? Link to comment Share on other sites More sharing options...
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