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thanks for the answer I will change the 5 preamp tubes

hello ! I have a mark IV since 2 years with changing the 4 power tubes and it was OK ,but now when I put it on ( after standby ) there are many cracking sounds during about 10 minutes and then it is good . what do you think about ? thanks you to every one .

hi ! I have a problem since today with the loops of my mark IV : I have loop station boss in the loop and I always hear it quietly and when I switch on the loop the sound of the guitar become faint . thanks for the answer . otherwise the amp is fabulous .

hi ! I use a boss rv3 combination of delay and reverb ( separately or simultaneous ) in my loop ; it' s amazing ;

hello eveveryone ! I want to buy a loopper like the boss rc 20 and I would how to install this : in serial between my guitar with pedal effects and the combo or in parallel in the loop behind the combo ? for exemple if I record the first loop with R1 and then I will play over a lead solo ? what...

hi ! thanks for answer . But can you , if possible , explain how can I do with the 6 external switching jacks and the only one switching G major and also put an expression pedal , even , like you say , it doesn 't play nice . on the forum I searched but not founded good explanations even in...

hello ! I have a mark IV and I wanted buy a G major but I just read in this topic that it damage the amp ! Where have you find this ? thanks for the answer . jean claude