Yes i have had the GM 200 OTL for about 2,5 years and ive heard the GM 20 as well , i sold it off after i listened 3 months to them on my new speakers with a diamond high frequency cone .
The smooth topend what i had with the graaf tube amp and i was missing with SS was merely a tweeter problem in my case , my highs are almost as sweet with ss as with tubes (zanden exepted ).
Further very good amps, spatial/dynamic as well , i sold them merely because they need new tubes once in while , and with the 32 in the GM 200 it will not be chaep, the bass is a bitt more rounded than with the krells but also beatifull , i rank them in the top of poweramps
The smooth topend what i had with the graaf tube amp and i was missing with SS was merely a tweeter problem in my case , my highs are almost as sweet with ss as with tubes (zanden exepted ).
Further very good amps, spatial/dynamic as well , i sold them merely because they need new tubes once in while , and with the 32 in the GM 200 it will not be chaep, the bass is a bitt more rounded than with the krells but also beatifull , i rank them in the top of poweramps