This amp is a very close copy of the mid '60s Model 1958 Marshall 18 watt combo done in head format. It has normal and vibrato channels but no reverb. This is actually built from a kit from Graydon Stuckey of GDS Aplification, LLC. Graydon founded the "Yahoo 18 Watt Group," and he is an acknowledged wizzard on these circuits. See www.GDSamps.com for lots more info. I adore this amp and made the cabinet right here to avoid custom shop cab prices. Let me know if you have an interest.