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Weird, I just bought a guitar off this guy. Haven't had a chance to play it through the new and improved Mark V yet, though.

I think the main takeaway for me here is to make sure the preamp tubes are sitting firmly in the socket next time I swap them, haha. Really looking forward to playing around with IIC+ mode after the change. I feel like I neglected it in favor of Mark IV mode prior to the swap. BTW, has anyone...

Thanks, I'm super relieved its not gonna cost me a trip to the repair shop. It powered up fine with all the lights on, but just no signal. Mute wasn't on either. Do you think one of the tubes wasn't sitting all the way firmly in the socket, and that could've killed the signal? I know that's...

So weird. On a whim, I pulled all the tubes and plugged them back in and now it works fine. Glad that it's a crisis averted. Interesting sound with the 12AT7. Haven't had too much time to play with it, but you can definitely crank the gain more on it. It also seems to take OD's in channel 3...

Hey guys, just swapped a jan philips 12at7 in the V4 position and when i turned the amp on, there was no signal. Swapped the original preamp tube back and still no signal. Don't know how I managed to break the amp doing a simple preamp swap, but the thing is fucked now. Any suggestions what...

Awesome explanation! Thanks for clearing that up for me!

Yeah, I think I'm currently running the gain at 1-2 o' clock right now. I'll take your guys word for it then. I was playing a Marshall Jubilee with a Maxon VOP-9 for metal before this, and that was plenty of gain for me. I think the Mark is a little deceiving because there's so much clarity even...

Hey guys, just picked up a Mark V a couple weeks back and have been enjoying the hell out of it. Its my first foray into Boogie amps after playing Marshalls for years, so there's been a bit of a learning curve. I have noticed the icepick in the highs and hi-mids when running the gain/treble high...