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Yeah had the same problem. Replace the V1 preamp tube with a new 12AX7. The V1 slot is the one with the metal housing over it push upwards and give it a slight twist to remove it. I hope I was able to help you a bit :P

In another thread on the forum somebody was discussing the Master and Channel volume settings but the thread went dead so I opend a new one. This is just me wondering about how "loud" other people play their Mark IVs. In comparison from: Home use <=> Band practice The guy in the other...

If we are talking bout Amp Master Volume above "4" how loud are your (R1 / R2 / Lead) individual channel volumes set up then ? On my Mark IV (Rev. A 1992) I always run my Master Volume on about 3 and my R1 (5) R2 (4) and Lead (2-5) depending on home use or bandroom. Other Lead Channel...

So I am asking again is this now the normal behaviour of a Mark IV ? Are there any Mark IV users who can tell me ? I appreciate any further helping advices :D

Changed my V1 preamp tube for a new Mesa Boogie 12AX7. Everything is working properly now, at least I think so. Clean channel with gain on 4 and channel volume on 5-6 is now as loud as the Lead channel with gain on 7 and channel volume on 3. Is this the way it is supposed to be ? Thanks...

With seperating i meant this ! There is an aluminum housing screwed over my V1-slot but I cant unscrew the 2 small screws without disassembling the amp! I cant reach the screws even with a very tiny screwdriver.

Hey guys, sorry for not answering for so long! I´ve tried the thing with the effect loop and the short patchcable which soudguruman recommended. If I hit the FX loop on switch my clean sound does not change at all. It gets neither louder nor quieter. So it seems not to change the sound...

Hey thanks for your answer :D No, that is not normal. Mechanical channel switching relay may have worn out contacts Does a defetive relay cause volume problems ? How´s that ? LDR (light dependent relays) may be defective "Normal Loop" jacks may have bad switching contacts. Since I am...

Hey to the Community :P I am pretty new to this board i´ve read a lot on Mark IV topics and so on. But lately i seem to have problems with my Mark IV Medium Head (A-Version)´s Clean Channel. At first my settings are: Full Power / Simul Class / Triode / Mid Gain R1 Gain = somewhere...