UG Community @ Ultimate-Guitar.Com

Logout

UG Plus Favorites

Profile Music

Welcome home, Stranger
Please Sign in or Sign up

you can also use

Facebook Google

UG plus: remove banner

		UG Community @ Ultimate-Guitar.Com > Instruments > Guitar Gear & Accessories
Marshall plexi for Mastodon and sludge metal

Page 2 of 2

01-21-2013, 01:43 AM

#21

T7E

All smiles :)

Join Date: Jun 2009

Location: 'STRAYA ****

Quote:

Originally Posted 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

__________________
http://soundcloud.com/evanlynch

Quote:

Originally Posted by TS

Another factor that has grown this myth is a bunch of opinionated guys who really don't know what they're talking about, which to be brutally honest is a bunch of you guys on here.

01-21-2013, 02:22 AM	#22
Cathbard Grumpy Old Tech Join Date: Oct 2009 Location: Australia	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. __________________ Gilchrist custom guitar Yamaha SBG500 Telecaster Ibanez Iceman Roland GP-8 Quadraverb Abbey Harmonic II Marshall JTM45 clone Marshall JCM900 4102 (modded) Marshall 18W clone Fender 5F1 Champ clone Marshall 1960A Cathbard Amplification

01-21-2013, 02:31 AM

#23

mmolteratx

UG God

Join Date: Sep 2008

Location: Richardson, Texas

Quote:

Originally Posted 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.

__________________
WTLT 2012
PBT Native
Gear
GG&A BotB Best Rig 2012

01-21-2013, 02:39 AM	#24
Cathbard Grumpy Old Tech Join Date: Oct 2009 Location: Australia	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. __________________ Gilchrist custom guitar Yamaha SBG500 Telecaster Ibanez Iceman Roland GP-8 Quadraverb Abbey Harmonic II Marshall JTM45 clone Marshall JCM900 4102 (modded) Marshall 18W clone Fender 5F1 Champ clone Marshall 1960A Cathbard Amplification** Last edited by Cathbard : 01-21-2013 at 02:50 AM.

Page 2 of 2

« Previous Thread | Next Thread »

Thread Tools	Rate This Thread
Show Printable Version Email this Page	Rate This Thread:

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off

Forum Jump

All times are GMT -4. The time now is 01:44 PM.