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Post subject: Effect Loop Mod on Fender Tonemaster. Need some guidance.
Posted: Thu Feb 02, 2012 2:10 pm
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Hi folx!

I'm doing an Effects Loop Mod on a fender tonemaster 100W head. The schematics are here:
http://www.blueguitar.org/new/schem/fender/tonemstr.jpg

The mod is: Effect loop for channel B (overdrive) used as common effect loop for both channel A and B. I figured moving the wires that go to the "send" jack for channel A over to the "send" at channel B, and jumping the relay "rly1B" so that loop B always is connected to the power-amp wether you switch for channel A or B.

This didn't work. channel A worked fine with nothing connected to the loop (B), but channel B was dead. signal to ground in some way. Channel A was also dead when i connected a pedal in the loop (b).

So i wired everything back in place, and the amp is back to "stock".

Can anyone explain to me how the mod is done? kinda stuck at the moment!

Thanks ;)


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Post subject: Re: Effect Loop Mod on Fender Tonemaster. Need some guidance
Posted: Thu Feb 02, 2012 4:28 pm
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Joined: Tue Jun 29, 2010 1:20 pm
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Hi torebrobakken@gmail.com,

Which wires did you move (colors/location)? Where did you hear of this mod, and are there any instructions?

Connecting a Y cable from the Send of both loops, to the input of your pedal board, then output of pedal board Y'ed into both loop Returns, will allow the same effects to be used on both channels (if it works). And, you can still keep two separate loops, which is a unique feature of the amp to begin with. This would also test if the internal mod will work or not. :idea:

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---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


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