Line Magnetic 518 + Piano, special?

Try it as an amp only and upgrade the tubes.

I have the LM 518, yes to upgraded tubes if one hasn't done so. Forget using it as a power amp with a separate preamp; despite having the hookup to do so the LM 518s preamp circuit stays in play so you don't get the full benefit.

Yes. Sorry should have specified that it is to be used with a preamp. Tube preamp in my system was better than solid state. I have been under the impression the preamp tubes were bypassed when using the pre in input. Do you feel otherwise? Or is the circuit still in play otherwise?

thanks,

mark

For whatever reason, the preamp tubes in the LM 518 are not bypassed when using the pre -input.

Thank you. I would like a more definitive answer if anyone has it. Regarding the topology of the preamp circuit and the pre- in input.  I have the same product. And am only asking for my sake.