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FRIED TUBE PREAMP

Hi All,
I've got this Bellari MP110 tube pre. It runs off a 12VAC (wall wart) power supply which tested good. The unit will not power up the tube ( tube is good) although the "ON" LED indicator faintly lights up.Upon popping the cover off I found the board had previously been repaired. It looks like someone added a small transistor and a resistor to the backside of the board. Rolls/ Bellari hasn't responded yet. Anyone familiar with tube pre electronics? Is it worth fixing?
Thanks
DrewV

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