Give Roger Modjeski a call at Music Reference, (805)687-2236.
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the mods were done in stages and can be seen on my Audio Virtual System Page. The blog discusses them.
Safe to say it has all been updated .......except for Rogers hand wound Transformers.
These are worth their weight in Gold - 8^0
Now people (friends) do not understand what I mean when I say this (weight in Gold), until they visit and see the RM9 sitting on the floor next to the Krell 600. The RM9 is dwarfed by the Krell. Yet they both do an admirable job of driving the 800 towers.
In this Audio Hobby Game....one holds the games trump cards when your amplifiers and preamps are designed with "ON THE FLY" adjustable Gain.
Schematic emailed to you.
Just last week I called Ram labs with a question about my RM9. Got voicemail so (at their suggestion) I emailed them. Roger answered in less than 24 hrs, with a suggestion that actually solved my problem! Can't ask for much better customer support for a 20+ yr old product! And manoman, did he ever build a keeper when he conceived of the RM9!!!
Roger silk screens the tube biasing info on his amps top plates, so that in fifty or a hundred years they can still be optimized. Built to last, and sound real good long after more fashionable amps have been long dead, their many owners having finally gotten sick of repairing them when a bad tube blew them up or set them on fire.