Behringer TM300 Tube Amp Pedal 'Clean' tone ?

using the pedal with Battery there's no EMi noise or hiss, nice bright Tone (TWiN model setting), but when 2 or 3 string played together the same time it was grumbling - maybe it's my Amp ...? ( Maybe you can't really hear it here online but in the real life it's annoying for me )

[@chrisgeo1642]

First you have the pedal on top of your amp and plugged into ac power. The interaction of electromagnetic fields is creating the hum and I am guessing your cables aren’t shielded.
I am also not sure why you expect a clean tone when the gain knob is set to 9 o’clock on an amp that isn’t going to add dirt but it’s a pedal not an amp and the gain is much more sensitive. I would also look at where the switches on the pedal are set including mic placement. The Brit setting is a preset higher gain than the tweed and the California is a bit higher than the Brit.
Overall not enough detail is given about the signal path, pedal setting, ac adapter or cables to point fingers at any one culprit.

[@jeremyhelm2833]

Take the pedal off the top of the amp and see if it is better behaved. Use a battery to start and keep the pedal about 2 feet away from the amp. May help. Good luck :)

[@brCharlieNagy]

Thanks, fella. Yeah I tried it with battery, the EMi hiss was gone , but the growling was still there .... :-/

[@localguy8]

Try a Bose L1 it has a clean tone

[@brCharlieNagy]

Thanks for the tip 🙂

[@ecstasy299]

No cab why??

[@brCharlieNagy]

What u mean 'cab' ?

[@ecstasy299]

😂cab is speaker but your speaker is not cab 😂

[@brCharlieNagy]

@@ecstasy299 that's the way they call battery powered units, for outdoor you - just FYi