The amp demonstrated here is a 1991 Randall RG-180DX "Deluxe" combo amp. They're considered as the "Post-ES" series, right before Randall introduced the Century models in early 1992. The preamp and power amp structure of the RG-DX & Century's is the same as the older RG-ES's for the most part. The Century has some slight differences in high frequency filter cap values and other power-amp upgrades but for the most part the tone generating components are 101% identical. I have personally seen the schematics on this amp and they clearly state that the Randall Century 200, Century 3000, RG180 DX and RG200 ES all share the same schematic. Darrell "Diamond / Dimebag" Abbott is hugely responsible for the popularity of these metal beasts, as people who are familiar with TAMPORA know these were the amps used to record "VDOP" & the "Far Beyond" albums. These Irvine era Randall's are the very few solid-state (FET) amps to hold their own amongst the many popular valve/tube amps. Like all solidstate Randall's.. these are VERY sturdy & loud! Late 2010; I've blown the fuse + preamp + power-amp section due to plugging it into a 220v socket by mistake, and after replacing a few diodes, not only did it get resurrected, it even sounded better! I was lucky to get hold of it along with it's rare FS-5 footswitch that allows you to change channels from the green channel to the red channel and also select both channels at the same time. Having both channels going at the same time gives you <b>...</b>