He Heard a POP...Then Came SMOKE!

Did I make an oopsie? The Ampeg GU12 I recently serviced comes back having smoked at a gig. Let's see what failed.
PART 1: https://youtu.be/j9OBf3KtwZ0
PART 2: https://youtu.be/Fbwj9jiSNfM
PART 3: https://youtu.be/v9EenBGTzQ4
PART 4: https://youtu.be/xj_2EorjpDA

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♠STUFF I USE
-5A Variac: http://amzn.to/2FNWthU
-Jameco Isolation Transformer: https://amzn.to/2PRv1Fa
-Fluke 87: http://amzn.to/2DwHjvr
-Yotec 936 Soldering Station: http://bit.ly/2JqB1Vw
-Sealody SSA51 soldering station: http://amzn.to/2DJTS7P
-Black and Decker Heat Gun: http://amzn.to/2DWpDhr
-Geekcreit® LCR-T4 Mega328 Transistor Tester http://bit.ly/2J9uLSA
-HT02 Handheld Infrared Thermal Camera http://bit.ly/2LXfLoD
-Solderless Breadboard: http://bit.ly/2stkVAq
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-Geekcreit® XR2206 Function Signal Generator DIY Kit http://bit.ly/2LYBvkb
-Contact Cleaner: http://amzn.to/2FVitro
-Deoxit Fader Cleaner: https://amzn.to/2LPwtsE
♠RECORDING
-JVC Everio Camcorder https://amzn.to/2RLIleU
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-Articulated Boom Arm with Cam Mount: https://amzn.to/2Hlo2AX
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♠BOOKS
-RCA TUBE MANUAL http://amzn.to/2GOBVqS
-DESIGN AND CONSTRUCTION OF TUBE AMPLIFIERS: http://amzn.to/2HSNMne
-Designing Tube Preamps for Guitar and Bass: http://amzn.to/2DK5tmt
♠2006 FENDER AMERICAN STD TELECASTER PICKUPS
-TV Jones Magnatron Neck: https://amzn.to/2q1zQjD
-Seymour Duncan Vintage Stacked Bridge: https://amzn.to/2GyZjrK