How to fix Fender smoking Bassman guitar amp process for tracking down and repairing negative bias

Hello my friends, another Fender Bassman hits the bench at D-Lab! This one is from the original owner. Had been stored for many years. When he decided to power it up, what happened? Yep smoke! So, the amp was hand delivered for evaluation. I searched the chassis for charred components, none found. Mystery? Well after some probing around, I determined that the negative bias adjustment pot was defective, causing loss of bias and baked tubes! It's not often that these pots fail, so I was a bit surprised. Hope this information is of value to you. By the way, my channel just went over 50K subs! Thank you all for your support over the years. TD

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