For more GAIN, The one wire mod.......

superleadfixer · 09-12-2006, 05:43 PM

Ok I received a few PM asking to explain how to do it, here is the basic procedure for making that modification to your amp.

It will put you pre amp section in cascade (series) to add gain....

Gain factor will be multiplied when in series instead of adding itseft in parallel (as it is normaly know, stock)...

This is for Super Lead type amp but you can do it on similar amp also... If you want to maximise this mod do a swap of caps before you begin.....The VOLUME II channel should use the .0022uF for coupling cap and the VOLUME I bright channel should use a .022uF coupling cap...also you should use the tone stack withthe 250pF on the treble with 56K slope resistor...also use .1uF for the PI caps....

Go to the VOLUME II pot....unsolder the wire in the center terminal of the pot wiper...then solder this wire to GROUND, you can just solder it to the next pin on the same pot that is grounded...

the mod itseft:Take a 1 MEG resisitor and solder it to the center wiper.... then take the other end of the 1Meg resistor and solder it to the junction of the 68K input resistors of CHANNEL 1 .........ie you solder it where the two 68K resistors are joined together for channel 1 ... Now yo are done.... now plug guitar into channel II then turn the Channel I and Channel II volume to 10 then keep the MAster Volume to control the volume.... You should now have a good amount of gain and crunch.... Now to add extra gain and crunch you will need a 1/4 male jack only with no cable attached to it.....take this plug and stick it into channel 1 jack and you will now get even more gain.....

For those wanting to try this mod it is imperative to have a Master Volume with your amp, if not it will work but won't sound very good, The MV will limit and control it, etc, Post Phase inverter master volume will do it perfect.....!!!

For those not familiar with amp work don't try this unless you know a little what you are doing, VERY HIGH VOLTAGE HERE, YOU MUST KNOW HOW TO DISCHARGE FILTER CAPS BEFORE PLAYING UNDER THE CHASSIS....

Have fun, will try to get a pic for that with the explanation, a little later!!

here's the pic, click on it:

***Guv'nor*** · 09-13-2006, 12:05 AM

Thanks a lot for the detailed info.

You rock!!!!

ROBWAGNER1231 · 08-05-2008, 10:48 PM

Hey Superleadfixer Do You Have Any Mods For Marshall Valvestate 100h Or Vs100h? Thanks

09-12-2006, 05:43 PM	#1 (permalink)
superleadfixer Senior Member Join Date: Sep 2006 Location: CANADA Posts: 99	For more GAIN, The one wire mod....... Ok I received a few PM asking to explain how to do it, here is the basic procedure for making that modification to your amp. It will put you pre amp section in cascade (series) to add gain.... Gain factor will be multiplied when in series instead of adding itseft in parallel (as it is normaly know, stock)... This is for Super Lead type amp but you can do it on similar amp also... If you want to maximise this mod do a swap of caps before you begin.....The VOLUME II channel should use the .0022uF for coupling cap and the VOLUME I bright channel should use a .022uF coupling cap...also you should use the tone stack withthe 250pF on the treble with 56K slope resistor...also use .1uF for the PI caps.... Go to the VOLUME II pot....unsolder the wire in the center terminal of the pot wiper...then solder this wire to GROUND, you can just solder it to the next pin on the same pot that is grounded... the mod itseft:Take a 1 MEG resisitor and solder it to the center wiper.... then take the other end of the 1Meg resistor and solder it to the junction of the 68K input resistors of CHANNEL 1 .........ie you solder it where the two 68K resistors are joined together for channel 1 ... Now yo are done.... now plug guitar into channel II then turn the Channel I and Channel II volume to 10 then keep the MAster Volume to control the volume.... You should now have a good amount of gain and crunch.... Now to add extra gain and crunch you will need a 1/4 male jack only with no cable attached to it.....take this plug and stick it into channel 1 jack and you will now get even more gain..... For those wanting to try this mod it is imperative to have a Master Volume with your amp, if not it will work but won't sound very good, The MV will limit and control it, etc, Post Phase inverter master volume will do it perfect.....!!! For those not familiar with amp work don't try this unless you know a little what you are doing, VERY HIGH VOLTAGE HERE, YOU MUST KNOW HOW TO DISCHARGE FILTER CAPS BEFORE PLAYING UNDER THE CHASSIS.... Have fun, will try to get a pic for that with the explanation, a little later!! here's the pic, click on it: __________________ I\'ll mod your SLP (or anyother...) Marshall to REAL plexi specifications/with real replica trannies/etc... http://myspace-332.vo.llnwd.net/0145...52020332_l.jpg

08-05-2008, 10:48 PM	#3 (permalink)
ROBWAGNER1231 Junior Member Join Date: Aug 2008 Posts: 1	Re: For more GAIN, The one wire mod....... Hey Superleadfixer Do You Have Any Mods For Marshall Valvestate 100h Or Vs100h? Thanks

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09-13-2006, 12:05 AM	#2 (permalink)
*Guv'nor* Moderator Join Date: Aug 2006 Posts: 243	Thanks a lot for the detailed info. You rock!!!!