Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

F-30, 50 and 100's

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rickc007
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Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by rickc007 » Sat Sep 05, 2009 9:53 am

Remember reading a while back, someone had a mod of sorts to allow
more use of the Master on an F-50

I play at home, and with the Gain dimed (which is where it should be :-)
on channel 2, I can barely move the Master before it's too loud

Someone posted a pic, of like soldering a short across 2 jacks, and
sticking them in the effects loop, then using that as a volume contral sort of
and you can get use the Master more

Can't find that pic anywhere

Anyone have, or remember this mod

Thanks

JimmyB
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by JimmyB » Sun Sep 06, 2009 11:14 am

I don't own an F Series amp any longer, and never got 'round to trying this with my F-30 before I sold it... but I think this is what you're looking for:

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rickc007
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by rickc007 » Sun Sep 06, 2009 11:16 am

Thank You Very Much :D

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by JimmyB » Sun Sep 06, 2009 11:56 am

Glad to help... apparently this tweak is 'the business' for any "F". :mrgreen:
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fabien
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by fabien » Sat Sep 12, 2009 9:48 am

It does work fine, I use it permanently on my F50, allows me to put my masters between 10:00 and 12:00 and still have frendly contacts with my neighbours... or stil have bandmates in my band :D

See also my last post on the parent page.

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by peedenmark7 » Fri Nov 13, 2009 6:45 am

I love this tip, what a difference maker! ...ran it in my f-100 1/2 stack [until sold] and find it to invaluable when running my f-50 !!!
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by giorikas81 » Thu Jan 28, 2010 2:28 am

works great even in the small f-30. The same with a volume pedal in the loop

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by Tmuggie » Wed Feb 24, 2010 9:17 pm

I just did this mod and it seems to work ok but I am not really sure what is going on circuit wise. I got to wondering though....about the v3 tube. Does it come into play all the time or is only relevant when you are using the effects loop. I am thinking that this mod could open up another door to tube selection.
Anyone have any knowledge in this area?
I am wondering how much the mix pot in the back of the amp comes into play here.... as far as......Does it determine the amount of v3 that is thrown into the mix??
I seem to be getting a fair amount of tonal difference depending on which knob is set where..... Master pot compaired to loop pot.

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elvis
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by elvis » Thu Feb 25, 2010 5:34 pm

The F-series loop is split out directly from the main signal path. There is not a separate drive or buffer circuit for the loop.

The path is V2-Tone-V1-V3a-Master-EQ-FXLoop-V3b-PowerAmp

The EQ is solid-state. Whether you drive the Master or the Loop, you should hear about the same result unless you saturate the EQ.
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by jwhitwell » Mon Aug 30, 2010 12:22 pm

Cool! Does this tax the tubes more/faster in any way?

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by SMOKESHOWIN1 » Thu Mar 31, 2011 1:46 pm

THIS SHOULD BE AN AUTOMATIC ON ANY F AMP!I JUST PLUGGED SEPERATE JACKS( SOLDERING THE TIP LUG TO THE SLEEVE ON ONE JACK)INTO THE EFFECTS LOOP,WHALA,INSTANT MASTER VOLUME FOR BOTH CHANNELS.I CAN'T BELIEVE THE DIFFERENCE.REALLY OPENED THE AMP UP.THANKS FOR PASSING ALONG THE INFO...I WONDER IF PUTTING A VOLUME PEDAL IN THE LOOP WOULD BE MORE CONVENIENT,THEN YOU COULD PUT THAT MASTER ON THE FLOOR IN FRONT OF YOU(WOULDN'T HAVE TO REACH BEHIND THE AMP)!

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by rs16iandy » Sat Apr 02, 2011 6:10 pm

at least you could still use the loop

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by greyblooz » Thu Sep 22, 2011 5:24 am

I burned my fingers ruining a perfectly good patch cable, but it was worth it for the extra control I get over the volume with this little trick.

Many thanks, Jimmy8!
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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume thing

Post by scandoslav » Thu Sep 22, 2011 11:32 pm

It really is incredible how well it works.

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Re: Mesa F-50 "Mod" jumper for effects loop, Master/Volume t

Post by beagle » Thu Aug 24, 2017 2:51 pm

I need to try this myself.

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