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SDuck thanks for the reply but man theres no reason to be quit so condescending in your answers to people. Most of use are smart people who are looking for help from somebody who may know more then us or have more experience. It dosnt make them dumb so theres no need to talk down to people. If...

Thanks for the reply i should have put ive tested and swapped out all of the power tubes and tried to run down a bad preamp tube. I located the preamp tube i believe was causing the popping, but all of the channels are still muddy and distorted. So im wondering could it be a bad solder joint on...

Also i noticed that V2 preamp tube is flashing when i switch from R1 to R2. Thanks

I recently purchased a Mark IV the first version It was built in 1990. I love the amp but it started making a popping and crackling sound even if i unplugged everything thing from it but the speaker(unplugged reverb, fan, effects even tried different cab) it made no difference. Sometimes its...