Mark V EQ Engage

[sherpa_man]

Hoping somebody can help me out. This has me scratching my head. I owned a mesa mark v combo and moved to a mark v head. My problem is, when I engage the eq on the amp, via the switch or the front panel, I get no change in tone at all.

I have tried to change the foot switch and cable, but it still does it.

Any ideas?

https://youtu.be/DAfXxmwdvog

 

[sherpa_man]

After having a mess around, the eq is always on. Even when it is switch off the eq sliders still change the sound.

 

[mace]

That is strange. The EQ light goes on when you engage it. Not sure what is going on there. Maybe email Mesa?

 

[user 41982]

Seems like a broken relay to me.

 

[APEMAN]

-

 

[jdgebha]

I had something similar but only on channel 2. No actuve eq period. Tech replaced jfets and viola. No too expensive either.