Ampeg SVT 7 pro bass head pumps out a ferocious kilowatt of pure Ampeg tone in a compact design that weighs in at just 15lbs. The SVT 7 pro features the same professional features as the other PRO Series heads including a flexible 5-position mid tone control, remote switching FX loop and a sleek onboard variable compressor. The tube preamp boasts a premium JJ 12AX7 that feeds the weight-defying Class-D power section. Sure it's portable and yes, it's small - but it can power everything from a small single PN-115HLF up to a monster Heritage SVT-810E. And at 80 cents a watt, the value is undeniable.