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Thanks for replies, I already sent the video to Mesa and the second time I spoke with them, they mentioned it may be lead dress from the pot. Amp is going back to service today and hopefully they can re-pot. My first thought was a leaky cap in the circuit but Mesa tech said no.

Hey all, Wondering if anyone has experienced a similar issue before ... CH. 1 Tweed, Normal Mode, Gain all the way up, with or without any input signal being applied. When sweeping the mid knob the amp self-oscillates through a certain range. Overall volume is set low, FX loop on/off makes...

Thanks guys!

Sorry if this has been asked before, probably has ... would owning both be redundant? I love my Mark V but also like what I'm hearing from JP2C. Thanks all!

Haven't tried yet to be honest, you're right tho, it may be something to do with the power in my place.

Just did yesterday and it's pretty much the same ... guess I'll have to live with it.

Just the inner pair as one was looking suspect with a burn mark ... was hoping that would solve it.

All channels/modes and is not dependant on gain or level settings ... it does not get quieter nor louder as I turn it up/down.

Hey all, Just got a brand new out of the box Mark V combo. Love the amp, sounds amazing. Just checking on one thing ... there is a low level hum when amp is off standby. It is not affected by either gain, EQ or volume settings. It goes away in Mute as well. It slightly varies in level...

https://www.tubesandmore.com/products/F-ZS

Extreme is was my instant favourite mode when I got my Mark V not long ago. Really like the immediate and tight response that stays aggressive even with the gain set lower (just passed noon). We had a gig on Friday and it sounded awesome. Here's a shitty iPhone clip ... I'm on the left and...

This ... one of the power tubes may have failed and is causing this. Also ... if your FX loop is not bypassed, try bypassing it and see if you experience the same and make sure the mix knob is at noon. Setting it too high may cause issues.

Thanks, I'm guessing that was not factory installed?

Hey all ... there is a Widebody Mark IV combo Rev B for sale locally but the speaker in it has no label. I called Mesa and they said any speaker they loaded in the combo would have a label and be either EV or C90. They also said the label would not just peel off either. Anyone know what this...

Thanks for the confirmation!

Hey all! new to the board, looking into getting a Mark V soon. I've sent an email to Mesa tech support but never heard back. Question: is the reverb circuit pre or post the effects loop? Thanks in advance!