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After having my Mark V head for a year, I have noticed in recordings I had made when I first got it that I have lost some gain from the amp. (in all modes) I have my gain at 3 o clock, treble around 2, bright switch on, and my GEQ treble sliders far up and still am not getting the gain I used to...

I've found a culprit! Can't get the master volume in channel 3 above 9:00 without squealing from the amp. I've isolated it that it is not the guitar pickups causing it. I'm using it in 90 watts Mark IV on channel 3. I'd figure it must be a microphonic pre-amp tube. With the head, I would have to...

My first set of 6L6s seam to have had their run and are in need of replacement. I'm thinking about trying EL-34s this go around and seeing how they sound. I'm a metal guitarist and I'm curious to whether this tube type would be good for that or not. If not, I'll simply install 6L6s again. I do...

This question my have been answered before somewhere, but I don't want to risk damaging my amp with the wrong speaker load. Current hookup: ONE cable from 8 ohms head to 8 ohms on the 4X12 recti slant. Hookup being considered: TWO cables from both 4 ohms to the two 4 ohms jacks on the 4X12...

After playing with my friend who has a line 6 spider IV 150 HD head on a line 6 4X12 cab, I noticed that my setup could drown him out...only if i was in front of my amp. It seams as though my mix only goes forward and doesn't spread out in different directions like his setup does. His cab sends...

I was curious if there was a way to use a line out on the Mark V to run directly into a P.A. system without the cabinet? :mrgreen: Any info will be appreciated.

I'm new here and to tube amps as well. I recently got a Mesa/Boogie Mark V setup for Christmas. After having replaced two rectifier 5U4GB short tubes :( (first time it just stopped working, second time it shorted out requiring testing and fuse replacing), I seek advice on hooking up speakers...