The Best Guitar Amp Ever?

If it were up to me, the candidate for best amp of all time would be a Plexi 50 watt head and a 4x12 cap with greenbacks in it. However, I'm going to give credit where it is due and choose another amp for my top honors given its greater versatility and great sound.

The late-50s Fender Bassman

There's no style of music you can't play with a Bassman, except for Meh-tal.

Enough clean headroom + that killer NMV grind when cranked.

With 4 ten inch speakers and a larger cab than most combos you have lots of warm low end without getting boomy and it's never boxy sounding. Ten inch speakers are also fantastic for cutting through with lead breaks -- more focused than 12" speakers in my experience.

Portable, rugged, reliable for the most part, and heard on countless hit records over the decades. The Bassman takes pedals well and is stump-stuipd to operate.

So, there you have it, the all-time guitar amp heavy-weight champion.