Why don't Mesa amps feedback?

[jerrydyer]

what about when you want it too? sounds like something isnt right.

 

[Mailman1971]

what about when you want it too? sounds like something isnt right.

Mine has GREAT 'controllable' feedback.
But none of the Squealing unwanted feedback.
Even at SUPER LOUD volumes.

 

[some dude]

The only issues I've had with microphonic feedback (the squealing type) has been due to pickups with loose windings.

 

[droptrd]

Mesa isn't as warm as a Marshall? ^ huh?

Maybe when you stick your hand in the back of it they are

 

[boardwlk17]

my mesa boogie aces feedback like crazy

 

[facefirst]

My Mark IV and Dual Recto get amazing controlled feedback out of them, and my gain settings are fairly modest compared to some people.

 

[UltraGary]

I love that feature or whatever it is.
I can play the Mark IV SUPER LOUD....and its quiet when I stand near it.
Gain up high......dead quiet.
But i can get all the CONTROLLABLE feedback I want.
My 5150 I cant get the gain past noon......still loud but in between songs I have to roll the guitar volume down or it bucks and squeals like a pig.

What he said. LOVE the musical feedback on my T-Verb whenever I want it but not the annoying squeely stuff when I don't.

 

[again with this]

Don't know if anyone else has experienced this, but I have hit the front end of the Recto and Mark V with a huge amount of boost with a large amount of gain already dialed in on the amps and they refuse to feedback. At least that's been my experience with the amps. Why are these amps different from all other amps out there on the market? Is the input gated or something? Do they have a ton of power conditioning in there? If it's not either of those then I have no idea what could be the cause of this.

Also, side question that's not really worth an extra thread. The Mark V has that 'Variac' mode, what exactly does that do? I've switched from Full to Variac and back and only can detect slight differences mostly headroom related. Does the Variac mode engage more power conditioning or what?

You seem to have found the holy grail of gain. My Mesa feeds back like any other amp if loud enough. Certainly, not facing the cabs and noise gate help a ton. I dunno... I can only guess you aren't playing at live/band volume or something.