Posted on Feb 5, 2014

This is one of the original brand-name folders created for the site, and for almost three years it has been empty, just someone`s distant memory - suddenly we have a nice pic and the circuit of the preamp. Thanks Richard. I`ve only a pre amp cct I traced from my unit in photo (forgive the haircut but it was 1985) Power amp was pretty much Fender t

Click here to download the full size of the above Circuit.

win: 100/50 W, 4x6l6GC, presence, slave out, 4, 8, 16ohm, Wicker trim. On the back of mine is a little plate that says Christchurch, NZ indicating that it`s a pre 80`s build as Ross relocated to Melbourne, Australia in the early 80`s. Serial number is 045, so I guess at least 50 of these were made around that time I`ve never seen another one like it, so I`m not sure how many would be out there. I bought this amp from Cash Converters in Parkdale for $300 in June 2008. I bargained them down from their asking price of $500 as I thought the amp was only half functional, with half the controls not functioning correctly. When I came home and inspected it further I realised, with a bit more tweaking, that it`s actually essentially a fully functional amp and has simply been customised so that the controls are not doing what`s indicated on the panel anymore, but have other functions. This conversion has basically involved turning a clean voiced AC-50 clone into a hot-rodded monster with a couple of knobs to control the two gain stages, and addition of a master volume control at the end. So, whilst the original controls would have been; (BRILLIANT) Volume, Treble, Bass, & (NORMAL) Volume, Treble, Bass, now the knobs function as Gain 1, Gain 2, Bass, Middle, Treble, and Master Volume. Gain 1 and Gain 2 controls basically add the same amount of gain when used individually, but have a cumulative effect when used together, facilitating...

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