help w marshall avt 20

chimaera

New member
Need help guys,.. i wanna change my preamp tube inside the ECC 833/12AX7 but dunno how to open the amp,.. i unscrewed the back panel but it wun go off like its glued,.. any ideas?
 
most of the time.... you´ll have to force it out. be careful and i´m not liable if you break anything.
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