Hi Don. On the Silver Series LM 218IA (845 amp) you can substitute different driver tubes, but not the output tubes. I owned one of these previously and it is another very nice amp. I tried various tubes as drivers in that but personally preferred the factory choices. There is no mention of substitution in the 518IA manual, other than tube equivalents.
I am not sure if running a Monbrison in would overload the amp, but apparently it doesn't, since it is working well for Neil. The pre-in feature bypasses the volume control. Not sure if it bypasses anything else. It is a great feature, and really expands the usefullness of the amp, imo.
One other note on the factory choices. I found the supplied power cord is a better option than some others I have tried. I assume like Shindo and Naim, they considered sound in their cable choice, not just price. Shindo and Line Magnetic seem to be made by music lovers first.
Last edited by guitardave; 03-06-2013 at 09:21 AM.
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