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Issues with FX Loop

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odgeuk:
Hi All
Hoping that there might some English speakers here who could help me.

I bought and assembled the Kit Seriel FX-Loop LND150 and then gave it to my amp tech to install in my 1979 JMP 2203 Master Volume 100w Head.

It's not working as expected. Firstly, there is clipping when I use my TC Electronic Flashback delay through it, especially on the low notes. But the main issue is that when I put in an MXR Micro-Amp for a volume boost, there is no boost, just more gain.

I called my tech and he said that he wasn't sure that I would like it, he set the levels in the FX Loop after a lot of time spent trying to balance it between too much gain and not enough. It has been set so that when a patch cable is put in the loop, the volume of the amp is at unity.

My amp tech has offered to take another look at it for me but he is sure it is wired as per the documentation. He does not feel that this is a 'usual' design and is suggesting a Passive FX loop if this doesn't work out.

Dirk:
Hallo,

it would be good to know how and where the loop got installed otherwise it is hard to tell what the problem is. In fact the loop should work fine in a JMP. The TC could be a problem because of the impedance but again, without a schematic and more information it is hard to tell what to do.
You can also send the amp to use for inspection and testing.

Best regards, Dirk

odgeuk:
Hi Dirk

Thanks for the reply.

Do these pictures help?

http://s721.photobucket.com/user/odgeuk/library/FX%20Loop%20in%202203?sort=3&page=1

odgeuk:
It does seem that the FX loop has been installed correctly between the Master Volume and the Tone Stack (starting with the Treble Control). And another feed taken out to the main JMP board (assume this is the B+).

Dirk:
Please provide a schematic, I won't trace pictures.
If unsure you can send the amp to us and our technic will check it.

Best regards, Dirk

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