I know this a relatively old thread... but I just picked up one of these, so I'd like to see how your story ended. Maybe I can apply what you learned. I picked up my 2612 last weekend from an estate sale and was told it was working... will see, haven't powered it yet. But if it's in relatively good shape, I'm thinking about trying to leave it almost as-is with a few tone-improving mods. But its setup is interesting... it has an input easily converted to guitar. It has an output for driving external cabinet. And a selector switch to operate in normal (input to tape,) external (playback to external cab,) and monitor which is a live output to the built-in speakers. While meant to monitor recordings... this means it already functions as a live amplifier. And then if the tape deck still works, either leave it as-is for a recording device... or convert into a tape delay effect. This unit was designed to be a "two-track" and setup to record in both directions - so maybe some interesting effects could be conceived with a few mods. Either way, I want to try to keep the magic-eye in the circuit as an interesting retro level indicator. So, ArcticWhite, how did yours turn out? Any other thoughts?