Bought this as a cadaver off the "Bay" for $24 bucks without a Faceplate,level controls,power transformer.Yeah I know,what the *beep* was I thinking!Well anyway I found a medium sized trans from a Marantz 240 that gives me the +/- 60 V needed so i put it in.The monster fired right up on the variac at about 35 vac and started to work.I was in shock that apparently the drivers and outputs were fine.Ran it up to 60vac for an hour then 80 and finally all the way up.The only problem is with Ch 2 level up full . ch 2 must be oscillating as the current draw goes to 1.8-2.0 amp.If you back the level control(soldered in some 10k pots to help troubleshoot)back to about 75% the draw drops to about .45 A ac.With a non factory transformer I'm assuming this is fine.In fact everything is fine.Ch 1 is flawless!Till you crank the ch 2 level over 75%.As long as the control is at 75% or less.Ch 2 is fine.No distortion,no nastiness of any kind. Any clues where to look.Haven't checked passives on the board as I thought to check here first for a lead or two.It is the first generation.The REAL early one with the normal/hysteresis switches on the sides.Bootstrap supply is good too. I know there are alot of you guys that have hundreds of repairs under your belts,and i'm just lookin to find the best place to start.And if anyone has an origional faceplate or a transformer I'm lookin.Again,the early one with the five fuse caps along the front bottom edge.
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