butifarra88
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Join date: Dec 2012
111 IQ
#1
Hi!
Recently a bought a Marshall Plexi. I play a lot of stoner and post rock and it works really well, but recently I'm more into things like Mastodon and sludge metal, and I really love that kind of sound. The problem is that I find it so difficult to find that kind of tone with this amp.

Any help? Should I change my amp to play that kind of metal? What kind of pedals or eq. should I use?

By the way, sorry if my english is a bit crappy : P

Thanks!!
mmolteratx
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#2
It's just not a very good amp for that. Though you could get it modded to cascade the lead input stage into the bass channel and then tweaked to sound better. Would wind up JCM800-ish though and you'd probably be better off just selling the Plexi and buying a Thunderverb or an 800 and then using a decent OD and fuzz.
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godgrinder
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#3
I would say keep if you like its tone for the other genres you play. Get yourself a good fuzz pedal to beef it up.

Any other reference bands other than Mastodon? I think you might be able to go into the (recent) Mastodon field with an overdrive pedal already...
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jesus=dinosaur
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#4
Pretty much what they said, a good fuzz, maybe a tube screamer (i know the guys in amstodon use them, but it could just be to tighten up their amps) or if you can find it they have a custom overdrive made, i want to say its a called the mastortion but i cold be wrong
godgrinder
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#5
Quote by mmolteratx
It's just not a very good amp for that. Though you could get it modded to cascade the lead input stage into the bass channel and then tweaked to sound better. Would wind up JCM800-ish though and you'd probably be better off just selling the Plexi and buying a Thunderverb or an 800 and then using a decent OD and fuzz.


Aren't the JCM800 2203/2204 basically Plexi's with a tad more gain? He should be able to get close to that with an overdrive or something.

The Thunderverb should be cool but if he really wants to sell his Plexi he should have enough money to get a Sunn Model T reissue.
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Perverockstar69
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#6
All you need is a good OD pedal man, your Amp can do those tones with not too much trouble AFAIK.

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mmolteratx
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#7
Quote by godgrinder
Aren't the JCM800 2203/2204 basically Plexi's with a tad more gain? He should be able to get close to that with an overdrive or something.

The Thunderverb should be cool but if he really wants to sell his Plexi he should have enough money to get a Sunn Model T reissue.


No, the 2203/2204 have an extra gain stage. You won't get that with just an OD pedal. I've had a few Plexi and JTM style amps and none were particularly great at sludge without a heavy fuzz. You could get a passable tone by turning both channel volumes up to 10 and slamming it with an OD, but at that point it's too undefined, even for sludge.
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VishNuRoXoUt
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#8
You could get pretty gnarly tones with a Musket Fuzz and an OCD. I'd use a Plexi for Mastodon all day.
Robbgnarly
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#9
I play in a prog metal band that has kind of a Mastadon sound. I use a JCM2000 DSL100 with a boost and I can get there just fine.
I love Plexi amps, but i don't think it is the right one for what you want. Laney AOR would be perfect and you can get the 50 watt for <$300 on GC used site. Sleep used them for years.

Laney GH 50/100 is also worth a look.
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#10
honestly most mastodon that doesn't have heavy fuzz is not that gainy.
I think the plexi is fine for what you want. not the best, but fine.
hit it with the aforementioned musket fuzz (holy shit...tried one yesterday) and you'll be good.
come to think of it, there was a time (times?) that the guys in Mastodon just ran their 800s clean and used dirt pedals for everything.
maybe get a drive/distortion or something
godgrinder
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Join date: Jul 2012
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#11
Quote by jesus=dinosaur
or if you can find it they have a custom overdrive made, i want to say its a called the mastortion but i cold be wrong


Just found it:
http://www.axeandyoushallreceive.com/product/monster-effects-mastortion
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mmolteratx
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#12
Quote by godgrinder


It's a low gain OD meant to push an 800 or similar and I'm pretty sure it's out of production, though I'm not 100% on that.
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Offworld92
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#13
IMO, Plexis are more cool for their history than for their actual usefulness. The JCM800 can do everything the Plexi does, and more, and has the (IMO necessary) benefit of a master volume.

If you want to up the ante again, +1 on the Orange Thunderverb. Possibly the best single amp for sludgy tones (the best combo I've ever heard was a Dual Rectifier A/B'd with a JCM, not sure exactly which one).
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#14
Quote by Offworld92
IMO, Plexis are more cool for their history than for their actual usefulness. The JCM800 can do everything the Plexi does, and more, and has the (IMO necessary) benefit of a master volume.

If you want to up the ante again, +1 on the Orange Thunderverb. Possibly the best single amp for sludgy tones (the best combo I've ever heard was a Dual Rectifier A/B'd with a JCM, not sure exactly which one).


+1
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butifarra88
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#15
Thank you very much guys for your advise!

Next week I'll try a JCM2000 from a friend. I have a TS and I think it should work for trying to find the sound. Do you think I should also use some distortion pedal?
Robbgnarly
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#16
I use a JCM DSL100 and my controls are set at presesce 11:00, Bass 2:00, Mids 2:00, Treb 3:00+ no mid shift engaged, but the deep switch on. I use it through a Krank cab with Eminence V12's and it slays

All I use is a TS clone and a Bad Monkey (which I always use) to boost it, gain at 2:00 on the ultra gain ch 1
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Last edited by Robbgnarly at Jan 20, 2013,
T7E
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#17
Ok bro,
There is a bill keliher rig rundown on youtube from their most recent tour. He uses a 800 with the preamp vol on 6 and the white hardwire distortion

Previously, mastodon have used the 800s, Brent ran a JMP along with an 800 and a silverware twin during the crack the sky era, he now runs an 800 along with a thunderverb and a diezel VH4. Around the blood mountain era at least Bill ran a laney VH100 and he has recently been talking up the Mesa Royal Atlantic.

The mastodon tone would be attainable with a plexi. Run it quite loud, due to the lack of master vol. Use your TS as a clean boost and then run a suitable distortionpedal of your choice.
For more sludgy tones, do the same but substitute the distortion for a musket fuzz or similar
Offworld92
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#18
Quote by butifarra88
Thank you very much guys for your advise!

Next week I'll try a JCM2000 from a friend. I have a TS and I think it should work for trying to find the sound. Do you think I should also use some distortion pedal?


Nah. You shouldn't be using the TS in a traditional sense anyway. You may know how to run it already, but just in case: level all the way up, drive all the way down, tone wherever it sounds best to you.

I mean, you can run dirt pedals in the same way, but it's very atypical, and for most pedals it just doesn't work right. Too much clipping.
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#19
Quote by T7E

The mastodon tone would be attainable with a plexi. Run it quite loud, due to the lack of master vol. Use your TS as a clean boost and then run a suitable distortionpedal of your choice.
For more sludgy tones, do the same but substitute the distortion for a musket fuzz or similar


This is what I don't get.

You say Mastodon tone is attainable with a Marshall Plexi but then you say 'run a suitable distortion pedal'

That doesn't count.

Anyone can run a distortion pedal to sound heavier. Most (lots) of people are more interested in attaining their tone with the amp.

The TS is asking if you can do Mastodon on a Plexi.

I can barely get there on my Splawn. I wouldn't want to be sitting there with just a Plexi.
Last edited by 311ZOSOVHJH at Jan 21, 2013,
Offworld92
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#20
Quote by 311ZOSOVHJH
This is what I don't get.

You say Mastodon tone is attainable with a Marshall Plexi but then you say 'run a suitable distortion pedal'

That doesn't count.

Anyone can run a distortion pedal to sound heavier. Most (lots) of people are more interested in attaining their tone with the amp.

The TS is asking if you can do Mastodon on a Plexi.

I can barely get their on my Splawn. I wouldn't want to be sitting there with just a Plexi.


Word.
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#21
Quote by 311ZOSOVHJH
This is what I don't get.

You say Mastodon tone is attainable with a Marshall Plexi but then you say 'run a suitable distortion pedal'

That doesn't count.

Anyone can run a distortion pedal to sound heavier. Most (lots) of people are more interested in attaining their tone with the amp.

The TS is asking if you can do Mastodon on a Plexi.

I can barely get there on my Splawn. I wouldn't want to be sitting there with just a Plexi.



Ok i get it.

Is the mastodon tone available on a plexi with no pedals or anything?
No
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#22
A JCM800 is basically a modded plexi. You take the two triodes in V1 and wire them in series instead of breaking them up into two input buffers (or jumpering them in parallel). Add a master volume before the phase inverter and you're done.
Any half decent tech can do it for you, most will mount the master volume pot into one of the input plug's holes. Once you've done the mod you can't jumper the inputs any more so two of the inputs become obsolete.
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mmolteratx
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#23
Quote by Cathbard
A JCM800 is basically a modded plexi. You take the two triodes in V1 and wire them in series instead of breaking them up into two input buffers (or jumpering them in parallel). Add a master volume before the phase inverter and you're done.
Any half decent tech can do it for you, most will mount the master volume pot into one of the input plug's holes. Once you've done the mod you can't jumper the inputs any more so two of the inputs become obsolete.


It's a little more complex than that, Cath. That's just the "one-wire" mod, but it sounds like shit due to stupid amounts of gain in so few stages. It really needs to be tweaked fairly heavily to sound any good, especially at lower volumes. I modded one of the PCB RIs 2-3 months back for a buddy. Wound up taking quite a few further mods, which wound up being a total PITA with the shit PCB design.
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Cathbard
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#24
You just shove a second gain knob to wash off some of the gain in the other input hole.
And **** lower volumes, it's a plexi.

If you want to do it right just add the components between V1a and V1b that are in the 800.
http://www.drtube.com/schematics/marshall/jcm800pr.gif
The bottom circuit of course.
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Last edited by Cathbard at Jan 21, 2013,