TJASSOC,
You missed that I said I purchased them new. I didn't want to respond until I gave the folks at GamuT a couple more days. They not only didn't respond to my 2nd email, they didn't respond to an audio associate of mine who knows them personally. GamuT makes great amps but the company seems to have a tumultuous history. I suspect that there's nobody there who was involved in the development of the M230. Sad story that they can't even track serial numbers. The amps were purchased in Jan. 2007 which, like dog years, is about 50 years ago in GamuT years. I've owned GamuT D100s, a D200, a D3 preamp, a CD1 and CD3 as well as GamuT L7 speakers. The M230s are my last holdout..While I wouldn't purchase any more GamuT gear I have heard a lot of good sounding music through their products.