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mumra
Junior
Username: mumra

Post Number: 32
Registered: 3-2010
Posted on Friday, October 01, 2010 - 2:31 am:   Edit Post

Hallo to all. I don't know if it's the right place to ask something. My bro has a Marshall JMP super lead 100 guitar head (not the reissue but the old one).This amp have not a gain and effect loop. He wants to add a preamp with gain on it. The problem is that he plugin the preamp into the input so it uses like a pedal and he doesn't take the result that he wants. Does anyone knows if there is a way to add an effect loop to the amp to plugin the preamp or something else. Sorry for my English.
adriaan
Moderator
Username: adriaan

Post Number: 2612
Registered: 6-2002
Posted on Friday, October 01, 2010 - 3:52 am:   Edit Post

Two channels, and double inputs per channel, right? You could run an instrument cable from the second input of the first channel, to the external pre-amp, and return the output of that preamp to the first or second input of the second channel.

Be careful with your levels - I'm not an expert on electronics, and other members have beter insight into these matters ...
mumra
Junior
Username: mumra

Post Number: 33
Registered: 3-2010
Posted on Friday, October 01, 2010 - 3:56 am:   Edit Post

right.Two channels, and double inputs per channel. I will try it.Thanks a lot
cozmik_cowboy
Senior Member
Username: cozmik_cowboy

Post Number: 787
Registered: 10-2006
Posted on Friday, October 01, 2010 - 7:48 am:   Edit Post

I am likewise no electronics expert, but I would not plug a preamp into the input; in my youth I decided my stereo wasn't loud enough to properly irritate my parents & plugged the headphone out - basically a preamp - into my Norma bass combo amp; fried solid state doesn't give the same stink as fried tube electronics, but it wasn't pretty. Goodbye, Norma.

Peter

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