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Hi guys. So I've got this Mark IV shorthead this afternoon. I turned it on. Everything was working fine. After 5 mins playing or so I noticed burning smell coming from the amp although the sound was still there. Immediately I turned it off, waiting for 5 mins or so and then turned it back on...

Until yesterday when I replaced my tube I didn't know I ran unmatched pairs of tubes for nearly a year now. Does that do any harmful to my amp?

Hi guys. Yesterday I replaced Class A tubes (initially Mesa 6L6 STR430) of my Mark IV to an used pair of STR440. I also swapped V1 and V3 with JJ's 12AX7's (initially stock Mesa 12AX7's). I played for quite a long time without any problems. But today the volume reduced gradually for about half a...

I have a Mark IV widebody and am searching for a 4x12 cab for it. I've read many good things about the Avatar 4x12 w/ V30's. How do you compare the Avatar 4x12 to the Mesa Recto cab when coupled with the IV?

Since I cannot afford another Mark IV and I've got a 2:90 I'm thinking about running the Mark through the 2:90. How do you compare these two power sections? I've seen pics of JP having both Mark IV and 2:90 in the same rack but I'm not sure if he ever runs the IV through the 2:90.

I'm retubing my 2:90. The old tubes are Mesa 6L6 STR430 and the new ones are gonna be Mesa 6L6 STR440. Do I need to bias or something?

Hi guys! What tube positions need to be matched pairs on a Mesa 2:90?

Guys, My 2:90 occasionally has no sounds. I flick the standby button off then back on and the sounds return. I don't know what's the problem here. I thought it's the standby switch. I tried to shake it gently around to find the mute point but I couldn't find it and the sounds still disappear...

I have a Mesa 6L6 GC power tube whose middle leg (the big central leg) has been broken. I can see inside the tube through the hole. Can I still use this without any harm to the amp?

Guys, I've heard some people pulling their tubes from their 2:90 to run it in class A. I wanna do the same to my 2:90 (for both channels) to reduce its power but I don't know which tubes can be pulled and how the tubes are arranged in both channels. The manual doesn't talk about that. Could...

Hi there. Now I want to use my 2:90 just in mono. Can I leave the other channel with no tubes without worrying about frying the output transformer?

Hi guys. Just received my 2:90 today. There were 2 tubes that have been broken. I just pulled out all the tubes before I realised that they're matched pairs. So now I have no idea which is which!! How can I recognise each matched pair of tubes? And where to install them (I mean a matched pair on...

As the title said I really dig young Petrucci tone, especially in I&W live in Tokyo, Rock Discipline and LTE1. I'm having a Mark IV right now and I can get Petrucci's current tone. Frankly I don't like it as much as Petrucci's old tone. Would a Triaxis rig get my desired sounds? I'm considering...

I'm a fanboy of young-Petrucci tone, especially I&W and LTE1, and I know he used Triaxis rig for these albums. I have a Mark IV right now. I DO get some good tones I admit, really Petrucci-esque, but the problem is that I just can't get the character I want with the Mark IV, I found it a little...

How do you compared the recording out tone to the miced tone? How close is it to the miced tone? And how do you connect the whole thing to record? I'm just a noob when it comes to recording so any helps would be greatly appreciate! Thanks guys

Has anyone ever run a Triaxis through a Mark IV? Honestly I can not afford a Mesa power amp or something to run the Triaxis. How do you compare Triaxis+2:90 to Triaxis + Mark IV power?

Hi there, I'm in search of a good cabinet at reasonable price. I'm in Australia so getting a Mesa cab is really a pain in the buck: a 4x12 Mesa cab sold for AUD$2395 (slightly above USD$2000) here in Australia! Now I've found a Randall 4x12 cab, here it is...

Hi everyone, After an financial effort I finally have a Mark IV Widebody combo (thanks to Mr. Potter who packed her very well to reach me overseas without any damages). The sound of the amp is very awesome, especially R2 channel which along with the EQ has very tight tone. R1 channel is very...

Hi all, I'm planning to build a extension cab for my upcoming Mark IV widebody. I need your recommendations for speakers. What type of speakers is good for a Marrk IV? 1x12" or 2x12" should be built? Thanks in advance