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Unread 03-12-2010, 07:45 PM   #1 (permalink)
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JCM 800 gain mods.

Well I love my jcm 800, but I would like a little more gain out of it, not so much that it sounds like a chainsaw, but just a bit more. Right now I'm just looking into all of my options. The FJA mods look pretty good, but 400 bucks sounds like alot for the mod I was looking at, and the soldano hot mod looked kinda cool, not sure how well they work though, just looking for some recommendations.
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Unread 03-12-2010, 07:48 PM   #2 (permalink)
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Re: JCM 800 gain mods.

Leave it stock, save some money and buy a Hot-Rod. Or put an Over Drive pedal in front of it.

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Unread 03-12-2010, 07:49 PM   #3 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by Rikochet View Post
Well I love my jcm 800, but I would like a little more gain out of it, not so much that it sounds like a chainsaw, but just a bit more. Right now I'm just looking into all of my options. The FJA mods look pretty good, but 400 bucks sounds like alot for the mod I was looking at, and the soldano hot mod looked kinda cool, not sure how well they work though, just looking for some recommendations.
Have you tried a simple overdrive pedal yet? There is a BILLION of them on the market..
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Unread 03-12-2010, 07:51 PM   #4 (permalink)
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Re: JCM 800 gain mods.

yeah, I use my ts9 in front of it for leads, but to me it doesn't really sound that great for rhythm tones.
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Unread 03-12-2010, 07:56 PM   #5 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Rikochet View Post
yeah, I use my ts9 in front of it for leads, but to me it doesn't really sound that great for rhythm tones.
**, get a different amp..
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Unread 03-12-2010, 08:08 PM   #6 (permalink)
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Re: JCM 800 gain mods.

There are some very simple mods you can do to that amp to get a little extra kick out of it.
Start reading this page. The mods are simple and effective.
Tales From The Tone Lounge; The Ultimate JCM800?
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Unread 03-12-2010, 08:14 PM   #7 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Adrian R View Post
**, get a different amp..
I love the sound of the amp, I just find that when I boost it with the ts9 I lose some of the bass and overall fullness of the sound, which I think sounds great for leads, but not so great for rhythm.
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Unread 03-12-2010, 08:23 PM   #8 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Rikochet View Post
I love the sound of the amp, I just find that when I boost it with the ts9 I lose some of the bass and overall fullness of the sound, which I think sounds great for leads, but not so great for rhythm.
*Try a different OD pedal. TS-9s in stock form can suck tone to a degree. A simple Maxon OD is far better and doesn't cut tone like a TS-9. I noticed this as well, that is cutting some of the amp's thickness, but did boost the midrange decently. There are MANY different boost pedals on the market. Many of them sound quite different. A high output clean boost pedal will do wonders for delivering more gain without sacrificing tone.

One of the best clean boost pedals I have used was Seymour Duncan's 'pickup booster' pedal. Relatively cheap, good quality, and offers serious TOTALLY TRANSPARENT,boost, better then most, if not all others that I have tried.

Experiment with different preamp tubes. They can have a huge impact on your amp's gain and impact characteristics. Tung-Sol 12AX7s produce quite a bit of gain as well as EH 12AX7s..
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Unread 03-12-2010, 08:54 PM   #9 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by jcmjmp View Post
There are some very simple mods you can do to that amp to get a little extra kick out of it.
Start reading this page. The mods are simple and effective.
Tales From The Tone Lounge; The Ultimate JCM800?
hmm, I'm going to have to look into those
Quote:
Originally Posted by Adrian R View Post
*Try a different OD pedal. TS-9s in stock form can suck tone to a degree. A simple Maxon OD is far better and doesn't cut tone like a TS-9. I noticed this as well, that is cutting some of the amp's thickness, but did boost the midrange decently. There are MANY different boost pedals on the market. Many of them sound quite different. A high output clean boost pedal will do wonders for delivering more gain without sacrificing tone.

One of the best clean boost pedals I have used was Seymour Duncan's 'pickup booster' pedal. Relatively cheap, good quality, and offers serious TOTALLY TRANSPARENT,boost, better then most, if not all others that I have tried.

Experiment with different preamp tubes. They can have a huge impact on your amp's gain and impact characteristics. Tung-Sol 12AX7s produce quite a bit of gain as well as EH 12AX7s..
I'm definentally going to look into that pickup booster, looks like it might be just what I need
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Unread 03-12-2010, 08:56 PM   #10 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Rikochet View Post
hmm, I'm going to have to look into those
The tone lounge mods are very good. It might be all you all need to get your rhythm tone where you want it. You can keep the booster/OD for leads.
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Unread 03-12-2010, 08:59 PM   #11 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by jcmjmp View Post
The tone lounge mods are very good. It might be all you all need to get your rhythm tone where you want it. You can keep the booster/OD for leads.
I know, I'm just not very keen on modding something my self, as I have never really done that kind of thing before, let alone tinker with electronics at all, do you think a local luthier/guitar shop would do that kind of mod?
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Unread 03-12-2010, 09:06 PM   #12 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Rikochet View Post
I know, I'm just not very keen on modding something my self, as I have never really done that kind of thing before, let alone tinker with electronics at all, do you think a local luthier/guitar shop would do that kind of mod?
local to where?
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Unread 03-12-2010, 09:59 PM   #13 (permalink)
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Re: JCM 800 gain mods.

Depending on what circuit board you have, you can swap out one simple resistor for more gain.

On the newer models, R6 is a 10k resistor, swap it out for a 4.7k. Where I had my gain at 8 before, it's at 6 now. Putting in a 1.5k would make it insanely distorted. This resistor is #4 on the tonelounge description.

You lose clarity though, even if you turn the knob down to compensate, so it's not just gain you... er, gain.
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Unread 03-12-2010, 10:18 PM   #14 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by Adrian R View Post
*Try a different OD pedal. TS-9s in stock form can suck tone to a degree. A simple Maxon OD is far better and doesn't cut tone like a TS-9. I noticed this as well, that is cutting some of the amp's thickness, but did boost the midrange decently. There are MANY different boost pedals on the market. Many of them sound quite different. A high output clean boost pedal will do wonders for delivering more gain without sacrificing tone.
.
I use the mxr microamp for this reason....you're right about the ts9, but the mid hump that it provides works well for me for solo boost and sustain, so I use it as a solo boost only, I like my solos to bit noisy though with feedback at the ready so it works really well for that, but I would never use it for rhythm sound.
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Unread 03-12-2010, 10:27 PM   #15 (permalink)
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Re: JCM 800 gain mods.

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I use the mxr microamp for this reason....you're right about the ts9, but the mid hump that it provides works well for me for solo boost and sustain, so I use it as a solo boost only, I like my solos to bit noisy though with feedback at the ready so it works really well for that, but I would never use it for rhythm sound.
Dude,
I too own the MXR Micro Amp. I still use it for different applications. Not a bad clean boost, but the Seymour Duncan p/u booster BLOWS IT AWAY!! Far more boost..and totally transparent.
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Unread 03-12-2010, 10:35 PM   #16 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Adrian R View Post
Dude,
I too own the MXR Micro Amp. I still use it for different applications. Not a bad clean boost, but the Seymour Duncan p/u booster BLOWS IT AWAY!! Far more boost..and totally transparent.
good to know, as I've been wanting a bit more gain out of it. maybe I can pickup the p/u for my boost and then run the microamp in the loop for a volume boost for leads. sounds like a plan.

I was thinking about an OCD, but feel like it will color my tone way too much. Any info on those?
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Unread 03-12-2010, 10:38 PM   #17 (permalink)
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Re: JCM 800 gain mods.

Try looking into EMG's Stuff. Like a PA-2 Boost for your guitars pickups. It's a clean trimable boost upto 20dbl or just get the Duncan pickup booster pedal. Same thing but I like-em on the guitar.
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Unread 03-12-2010, 10:40 PM   #18 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Adrian R View Post
**, get a different amp..
Yeah, a JCM 900 will sound a LOT better...

Seriously, when is the last time you got new tubes and/or checked the bias? I can see someone saying a DSL or SLX is more suited for their music than an 800, but they should still sound really good.

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Unread 03-12-2010, 10:44 PM   #19 (permalink)
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Re: JCM 800 gain mods.

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Yeah, a JCM 900 will sound a LOT better...

**HA,I know mine would!!

Seriously, when is the last time you got new tubes and/or checked the bias? I can see someone saying a DSL or SLX is more suited for their music than an 800, but they should still sound really good.

Ken
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Unread 03-12-2010, 11:05 PM   #20 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by ironlung40 View Post
good to know, as I've been wanting a bit more gain out of it. maybe I can pickup the p/u for my boost and then run the microamp in the loop for a volume boost for leads. sounds like a plan.

I was thinking about an OCD, but feel like it will color my tone way too much. Any info on those?
What is a 'OCD'? Are you not using a MK3?? It has a boost channel! As far as running the MXR M/A in the loop..ahh HELL YA..its almost perfect for that..in fact in light of Jesta's revelation by looping the FX loop externally, I think I might try it as well. The SD p/u booster I believe would be too strong for that application in where the MXR is more laid back and most likely could be dialed in correctly to get the right boost without over driving the circuit.
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Unread 03-12-2010, 11:29 PM   #21 (permalink)
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Re: JCM 800 gain mods.

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What is a 'OCD'?
Fulltone OCD - Its an OD pedal.
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Unread 03-13-2010, 12:07 AM   #22 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by Adrian R View Post
What is a 'OCD'? Are you not using a MK3?? It has a boost channel! As far as running the MXR M/A in the loop..ahh HELL YA..its almost perfect for that..in fact in light of Jesta's revelation by looping the FX loop externally, I think I might try it as well. The SD p/u booster I believe would be too strong for that application in where the MXR is more laid back and most likely could be dialed in correctly to get the right boost without over driving the circuit.
no mk3 here ....I do have an slx and a 4100, and a 6100, and a 2203 and a ..........hell, I need a mk3 too. I'm going to get on that.
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Unread 03-13-2010, 04:31 AM   #23 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by Adrian R View Post
*Try a different OD pedal. TS-9s in stock form can suck tone to a degree. A simple Maxon OD is far better and doesn't cut tone like a TS-9. I noticed this as well, that is cutting some of the amp's thickness, but did boost the midrange decently. There are MANY different boost pedals on the market. Many of them sound quite different. A high output clean boost pedal will do wonders for delivering more gain without sacrificing tone.

One of the best clean boost pedals I have used was Seymour Duncan's 'pickup booster' pedal. Relatively cheap, good quality, and offers serious TOTALLY TRANSPARENT,boost, better then most, if not all others that I have tried.

Experiment with different preamp tubes. They can have a huge impact on your amp's gain and impact characteristics. Tung-Sol 12AX7s produce quite a bit of gain as well as EH 12AX7s..
If you find thet your OD pedal sucks your tone why not try boosting those frequencies with an EQ that way you reboost the sucked frequencies
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Unread 03-13-2010, 04:38 AM   #24 (permalink)
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Re: JCM 800 gain mods.

I suggest the Blackstar HT Boost. It is like adding two gain stages to your amp. And it's VALVE driven, not solid state like teh other boost pedals listed.
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Unread 03-13-2010, 09:17 AM   #25 (permalink)
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Re: JCM 800 gain mods.

If you're looking for an OD pedal for a marshall, I can't really see any better pedal than the Fulltone OCD. I use mine in front of my JCM and my VM. I just turn up the volume a little bit to get a little more crunch.

I like it also because you can use different power supplies (from 9 to 18v DC) for the pedal itself and it makes a huge difference. 9v is good for a more subtle tweak, with still a lot of extra "mustard" on tap. With an 18v adapter plugged into it, its a monster. The OCD has a natural british/marshall tone to it already, which is why I think it compliments them quite well. With the HP/LP switch, volume/drive/tone knobs, and a choice of power supplies the OCD is pretty versatile IMO.

Also for some extra grunt I just dial up the volume on my MXR 10 Band EQ, that seems to help for a little more push.

Personally I'd go out and play 200 different pedals before I'd touch my amp.
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Unread 03-13-2010, 10:26 AM   #26 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Julesman64 View Post
If you're looking for an OD pedal for a marshall, I can't really see any better pedal than the Fulltone OCD. I use mine in front of my JCM and my VM. I just turn up the volume a little bit to get a little more crunch.

I like it also because you can use different power supplies (from 9 to 18v DC) for the pedal itself and it makes a huge difference. 9v is good for a more subtle tweak, with still a lot of extra "mustard" on tap. With an 18v adapter plugged into it, its a monster. The OCD has a natural british/marshall tone to it already, which is why I think it compliments them quite well. With the HP/LP switch, volume/drive/tone knobs, and a choice of power supplies the OCD is pretty versatile IMO.

Also for some extra grunt I just dial up the volume on my MXR 10 Band EQ, that seems to help for a little more push.

Personally I'd go out and play 200 different pedals before I'd touch my amp.
**Very wise there man, very..........Especially considering retailers like GC and MF offer such liberal return policies..it really eliminates the risk of making a bad decision.
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Unread 03-13-2010, 10:37 AM   #27 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by wkcchampion View Post
I suggest the Blackstar HT Boost. It is like adding two gain stages to your amp. And it's VALVE driven, not solid state like teh other boost pedals listed.
I tried out a different 'valve driven' 'British' OD pedal a couple years back in which was like $200.00+..the name escapes me right now..however, it was a popular one that is still being made. Bottom line it sounded like shit..muddy as hell..and required its own power supply making it impractical for a traditional powered pedal board system.

So far my Maxon OD pedal is the best sounding OD I have yet to try. Unfortunately, the first one broke rather rapidly, Maxon sent me a replacement which works fine, but I don't trust it as the build quality imo is questionable.
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Unread 03-13-2010, 11:11 AM   #28 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Adrian R View Post
I tried out a different 'valve driven' 'British' OD pedal a couple years back in which was like $200.00+..the name escapes me right now..however, it was a popular one that is still being made. Bottom line it sounded like shit..muddy as hell..and required its own power supply making it impractical for a traditional powered pedal board system.

So far my Maxon OD pedal is the best sounding OD I have yet to try. Unfortunately, the first one broke rather rapidly, Maxon sent me a replacement which works fine, but I don't trust it as the build quality imo is questionable.
Auch really? They should sound very good on paper.
The Blackstar is not an OD pedal though, it's just a valve-driven boost. Like having two additional gain stages. So you may have been another one, perhaps a Tonebone?
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Unread 03-13-2010, 11:23 AM   #29 (permalink)
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Re: JCM 800 gain mods.

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Originally Posted by Adrian R View Post
What is a 'OCD'? Are you not using a MK3?? It has a boost channel! As far as running the MXR M/A in the loop..ahh HELL YA..its almost perfect for that..in fact in light of Jesta's revelation by looping the FX loop externally, I think I might try it as well. The SD p/u booster I believe would be too strong for that application in where the MXR is more laid back and most likely could be dialed in correctly to get the right boost without over driving the circuit.
OCD==Obsessive Complusive Disorder or Monk-in===The need for/or endless search for a better sound or, Complusively spanking of the money even in public places & hoping someone will catch you. Constantly checking over and over if you turned your amp off sometimes upto 50 times a day
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Unread 03-13-2010, 11:33 AM   #30 (permalink)
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Re: JCM 800 gain mods.

Quote:
Originally Posted by wkcchampion View Post
Auch really? They should sound very good on paper.
The Blackstar is not an OD pedal though, it's just a valve-driven boost. Like having two additional gain stages. So you may have been another one, perhaps a Tonebone?
Yes, thats it!
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*Some* hearing loss?
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