The point is moot now as the preamp has been sold. Either the OP bought it or someone else did.
https://www.audiogon.com/listings/lisa8bfd-mcintosh-c-46-solid-state?refsource=hifishark
https://www.audiogon.com/listings/lisa8bfd-mcintosh-c-46-solid-state?refsource=hifishark