My whole basement was full of smoke when the transformer burned on my Garnet. Previous owner had thevwrong fuse in it. Had the amp re -capped and maintenanced along with genuine Garnet transformer replacement.
Sounds like you should get away with a lot less than $700. Good luck!
White smoke is usually a cap being over stressed...too much voltage.
If you are going to open it up to determine the cooked parts they should quite obvious.
There may be a powder trail leading to the culprit.
If you are going to attempt the repair, I suggest investing $20.00 and building an amp/component / headache saver.
Lots of simple build designs and info out there.
There may be a reason other than old age why the component cooked, the series- load- light bulb will allow you to troubleshoot, if so inclined. Good luck.
I had an amp do that. Dropped it off with a knowledgeable friend. Called me a few days later to let me know he managed to get the smoke back in. I thought I had just melted it with my shred but apparently something on the power supply side had needed some solder.
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