If you have a preamp problem, I believe it's the same preamp as the VT-30. You can find that schematic with a forum search. I haven't seen a VT-15 schematic, but it's probably a single IC output design and should be relatively simple- maybe a TDA2030 or something of the sort?
"I took a photo of my ohm meter... It didn't help." Enzo 8/20/22
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