The preamp is correct and its a toshiba ,but not spinning
but in the previous message you've written that the PATIENT board installed on the DONOR drive was not making it to spin
if that was the case, the preamps of the two drives are not matching
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while if the PATIENT board on the PATIENT drive WITH original PATIENT heads , when powered makes the drive to begin to spin (stop it as soon it begin to spin) , you have the confirmation that the PATIENT board if fine and operational/working
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after this brief test, if the DONOR drive with ITS original board and original heads spins and goes DRD DSC, you have the definitive confirmation that the preamps of the two drives are NOT matching