Yes, the top head is a 1977 non molested custom 100 / DR103 built by Hylight Inc, the custom 50 is much newer, 1993 DR504 built by audio Brothers, basically a Hiwatt clone but they used the ecact specs from Hylight, same vendors and and components built to military spec like the Sound City/Hylight era amps....both are very cool amps....there are not many clones because these amps could not be improved like mfg production line Fenders/Ampeg/marshalls
I happened upon HIWATT purely by accident, an unintentional trade which I didn't care about, I am so glad I made the trade now.....Anyway, here is a good brief summary of history of HIWATT.
Bsman, I want a 4X12 cab loaded with Fane's, right now I use two home made 2X12 cabs, one is loaded with V30's, the other Eminence Redcoat Tonkers.