London Power/Power Scaling control 12W down to less than 1/2WCustom Mercury Magnetics transformersSoZo vintage style mustard capacitorsDual power tube sockets for use with any octal power tubeThe ability to mix and match tubesDC filaments for ultra quiet operation1/8" aluminum chassis for the true vintage British amp soundImproved 3 position rotary Decade SwitchPassive FX loop