The Ugly 18 is a 2 x el84 all tube hand wired guitar amp with two channels, they are voiced in such a way that they sound great bridged , the normal channel has both a volume and a tone control and a nice fat tone available plenty of gain, the bright channel has a ton of drive also but it has a much more focused bandwidth in the mostly highs and mids this is why this channel needs no tone control, when bridged this channel volume control acts a lot like an active midrange control its very cool! Of course when bridged you get even more gain which really drives the el84's home!