Difficulty getting musical feedback from Mark amps

[pastorofmuppets]

I currently have 4 Mark amps (IIB+, III red, III++ green and IV), typically I play through either x2 thiele cabs with EVs, or a halfback with EVs and 100 watt Celestions. I’ve found getting musical feedback is difficult even at deafening volumes (with the halfback at 600 watts that may be only 2 on the master). I also have a 2203 and at same or lower volumes I feedback the second I let go of the strings. With that the Mark’s tend to not need a gate while the 2203 absolutely does, maybe that’s related?

Over the weekend I played both my III red and a Badlander 25 back to back at band volumes and the Badlander has quick onset feedback like the Marshall, the Mark again was almost impossible to feedback.

Does anyone else experience this and if so have any idea what about Mark amps may be more resilient against feedback? For reference I’m playing high gain with the GEQ in a subtle V.

 

[CoG]

take the geq out, take your hands off the strings, face the cab. firmly tap the guitar body with two fingers and see which if any strings start feeding back. mute strings individually with your pick hand to test. start doing barre chord shapes up the neck, don't hit them, same thing, tap the guitar body. you'll start finding your easy feedback spots. now put the geq back in and see if you've lost them. remember that controllable musical feedback is almost always from your wound strings.

you will find it a lot easier to develop feedback with a bigger cab throwing at your guitar, I can't reliably get good feedback off a 1x12 unless I put it at belt buckle level.

I can only speak to the mark III but it definitely takes more practice to get good sustained feedback started than a recto or 800. I think it's that Marks generally don't really put out a lot of bass, which is what gets the strings vibrating. pulling the deep switch will help but that's not great for most high gain situations.

 

[pastorofmuppets]

take the geq out, take your hands off the strings, face the cab. firmly tap the guitar body with two fingers and see which if any strings start feeding back. mute strings individually with your pick hand to test. start doing barre chord shapes up the neck, don't hit them, same thing, tap the guitar body. you'll start finding your easy feedback spots. now put the geq back in and see if you've lost them. remember that controllable musical feedback is almost always from your wound strings.

you will find it a lot easier to develop feedback with a bigger cab throwing at your guitar, I can't reliably get good feedback off a 1x12 unless I put it at belt buckle level.

I can only speak to the mark III but it definitely takes more practice to get good sustained feedback started than a recto or 800. I think it's that Marks generally don't really put out a lot of bass, which is what gets the strings vibrating. pulling the deep switch will help but that's not great for most high gain situations.

I’m often using a 4x12 at permanent hearing damage levels, so that part isn’t an issue. I haven’t tried with the GEQ off so that will he the next test.

 

[danielpasco]

I did a series of extremely bad impressionist covers of the guitar solo from Mother several years ago (playing from memory and wow, string bends can be tricky to nail), and one of the things that I tried to characterize was musical feedback digs around



I used a boost with these and probably a compressor. Volume levels were sane (at home practice with family in the house, probably 90 dB, tops)