peel Posted March 12, 2002 Share Posted March 12, 2002 Hi myles Im sure the little marshall jubilee posse would love to get your take on this amp - I tracked down the schematic for the 50w version and I wonder if you could take a look at it and advise on best approach to getting a clean and/or distortion sound, using boost or distortion pedal and anything else that you feel worth passing along. thx in advance, peel heres the link to the schematic: http://home.att.net/~amptech/2550.gif Link to comment Share on other sites More sharing options...
peel Posted March 12, 2002 Author Share Posted March 12, 2002 bump Link to comment Share on other sites More sharing options...
LesPaul59 Posted March 13, 2002 Share Posted March 13, 2002 I'll tell you the best way to get a good clean/distortion sound out of your 2550. I own a Slash head, which is basically a 2555. This is what I do. First of all, get a quad of JJ E34Ls from Bob at Eurotubes. As far as the preamp tubes are concerned I'm still trying different things out; I'll keep you posted. The trick is to get a Boss GE-7 Pedal and a THD Hotplate. I also run an Electro-Harmonix Holy Grail Reverb pedal into the FX Loop which is not necessary but adds a lot to the clean channel. By having the THD Hotplate, you can set your Master Volume at 6 (or past 6) to get the power tubes going good. The amp is VERY loud so the THD taims it well. First set your amp to sound good clean. I personally like it on Presence 8, Bass 8, Mids 3, Treble 6.5 I currently have some Chinese preamp tubes in V1 and V2 and a JJ ECC83S in the phase inverter (V3). Chinese preamp tubes have some midrange which explains why I set my Mids conservatively. Depending on your preamp tubes you might want to turn them up. I run the GE-7 into the input with a boost in the mids, and a cut in the bass and treble (the EQ looks like an upside down U) and its level all the way up. It allows me to boost on the clean channel to get an AC/DC type crunch. It also allows me to get a massive gain on the lead channel. I can get some very fat lead tones this way. I set my input gain somewhere around 7-7.5 This combination allows me to get a very clean channel, an AC/DC like overdrive with the EQ pedal, an 80's style overdrive with the lead channel, and lots of gain on the lead channel with the EQ pedal. It's just awesome! Link to comment Share on other sites More sharing options...
machinex Posted March 13, 2002 Share Posted March 13, 2002 Now thats a good idea. I have the 2555 and as soon as I can rack up the coin I plan to buy a Marshall power brake (which is essentially the same thing as the hot plate.. but is there any beneficial difference? or is it just personal preference?) I also have a GE-7 but the only thing I use it for right now is to give my clean channel a little mid and treble boost because when I use the clean channel, my les paul is set to rhythm which makes it kind of bass-y.. so the GE-7 helps to even everything out. Currently under the conditions in which I play.. the lead master doesnt get to go past 2.5 / 3, and the input gain is usually on at around 8 (which is rediculously loud when clean is engaged. On an unfortunate note: I noticed a rather inconvenient flaw with my amp.. from the moment I started playing on it, I noticed the push/pull pot of the output gain had a loose connection (when I would push or pull it to switch channels it would crackle a little bit and if I didnt get it right, the sound would cut out and I have to tap the knob a little) Well I figured using a footswitch would take care of the problem since I wouldnt have to touch the pot.. however even when using a footswitch, it still does it. Tonight at practice was horrible, it usually happens when switching channels, the sound will just die out and I have to tap on the knob.. and in some cases just by playing with a little force on the clean channel causes it to cut out too.. so im guessing the vibration of the sound is loosening the already bad connection. This is fixable (but inconvenient) when im at rehearsal but I cant have that on stage. So tomorrow is gonna be all about finding an amp repair specialist.. I wish I knew how to fix it myself but i have no clue and i refuse to let anyone but a professional even touch it. damnit Link to comment Share on other sites More sharing options...
LesPaul59 Posted March 13, 2002 Share Posted March 13, 2002 machinex, The THD Hotplate is BY FAR the best power attentuator around. It is MUCH better than the Powerbrake. It has some added features that the Powerbrake doesn't have, namely Deep/Bright switches to compensate for the loss of power going to the cabinet. It also has some noise reduction which provides approx. 10 dB of broad band noise reduction. Just be sure to get the one with the right impedance for your amp/cabinet. Link to comment Share on other sites More sharing options...
peel Posted March 13, 2002 Author Share Posted March 13, 2002 Originally posted by LesPaul59: I'll tell you the best way to get a good clean/distortion sound out of your 2550. I own a Slash head, which is basically a 2555. This is what I do. First of all, get a quad of JJ E34Ls from Bob at Eurotubes. As far as the preamp tubes are concerned I'm still trying different things out; I'll keep you posted. The trick is to get a Boss GE-7 Pedal and a THD Hotplate. I also run an Electro-Harmonix Holy Grail Reverb pedal into the FX Loop which is not necessary but adds a lot to the clean channel. By having the THD Hotplate, you can set your Master Volume at 6 (or past 6) to get the power tubes going good. The amp is VERY loud so the THD taims it well. First set your amp to sound good clean. I personally like it on Presence 8, Bass 8, Mids 3, Treble 6.5 I currently have some Chinese preamp tubes in V1 and V2 and a JJ ECC83S in the phase inverter (V3). Chinese preamp tubes have some midrange which explains why I set my Mids conservatively. Depending on your preamp tubes you might want to turn them up. I run the GE-7 into the input with a boost in the mids, and a cut in the bass and treble (the EQ looks like an upside down U) and its level all the way up. It allows me to boost on the clean channel to get an AC/DC type crunch. It also allows me to get a massive gain on the lead channel. I can get some very fat lead tones this way. I set my input gain somewhere around 7-7.5 This combination allows me to get a very clean channel, an AC/DC like overdrive with the EQ pedal, an 80's style overdrive with the lead channel, and lots of gain on the lead channel with the EQ pedal. It's just awesome!But isnt yours a 100w and therefore more likely to need a THD?? Mines loud but not that bad. Link to comment Share on other sites More sharing options...
machinex Posted March 13, 2002 Share Posted March 13, 2002 Hey, I checked out THD's website and read all about the hot plate. It does sound like a great unit. I like pretty much all of its features so I think i'll pick on of these up instead, Thanks Les. Since im not really well versed with impedance, what is the jist of it? I think mine is set to 8 ohms. What is the reason for setting them otherwise? Link to comment Share on other sites More sharing options...
peel Posted March 13, 2002 Author Share Posted March 13, 2002 whats a Quimby? Link to comment Share on other sites More sharing options...
machinex Posted March 13, 2002 Share Posted March 13, 2002 The Simpsons. ever notice how when mayor quimby gets caught doing something bad or is in a tight spot, right before he runs away he always says in a low voice "vote quimby". Link to comment Share on other sites More sharing options...
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