Eddie's 5150 was not stock.. i heard he ran it with a single power amp tube EL34/6CA7 totally over biased and cranked the $% out of it.. this would blow your amp without a doubht every single night.. hence his use of peavey to supply him with shite loads of amps for free which he fried every night.
you can't tell me a 5150 or 5150II sounds anything like his live tones, im not saying the stock 5150 is a bad amp but i've heard some fantastic modded ones eg, some changes to the tone control network and bias trim pot to have a wider range so you can bias them hotter to warm the amp a lot.. this really gets it into Soldano Terratory!
and when the 5150 was going through it's marketing phase and gaining popularity all the recordings Eddie credited to the 5150 were actually Soldano.