Opinions on Graaf Amps

I purchased a pair of Sonus Faber Guarneri's and have tested maybe 10 amps. I have kept the Graaf GM20 otl as my final choice. It is quiet, accurate, detailed warm.
I am listening to the system at low volumes in a 10x11 office so the mono route is not neccessary (but at louder volumes I find the bass control lags). This is an exceptional rare product that continues to fascinate me with musical enjoyment. I have ordered a GM200 for another system and will be recieving it soon, GRAAF makes products of high quality and refinement. Such products are becoming harder and harder to find in todays cluttered marketplace. I am glad I stumbled on this beauty.

You might also want to check out Mastersound, which I have been peased with, just to stick with the Italian theme. They make excellent amps.

I ahve beeen an audiofile for almost 30 years. For the last 25 years I listen my music through various Tannoy dual concentric loudpeakers. I have used almost all type of amplification (Tube and solid state of various power from 7W to 200W and various configuration single ended, class A push pull ) except OTL amps. Two months ago I have accuired a GRAAF GM 20 to drive my 15'inch prestige Tannoy GRFs. Since then every day has been a revelation to me. I love my Tannoys but now they sound so good that i have never heard them before. For those that are familiar with good 300B single ended sound I state that at least with my spaekers the result with the GRAAF is 10 times better. Excellent and very serious Amplifier. If you have sensitive 8 ohms loudspeakers you sould considerit very seriousely.

Regards

Chris
Athens Greece

Hi.

I have had a GM2 for 6 years and i can testify to about everything that has been said about it in the earlier posts.
The sound is big, smooth, fast, detailed, controlled. Never heard better, but I have not heard the Joules and Tenors. What I know is that everything else I have heard in comparison sounds slow and syrupy.
But owning the GM20 is not without hassle. You HAVE to buy matched output tubes. That is a must. You have to adjust the BIAS an DC offset about every 2-3 month. For that the amp must be turned up side down, the lid under unscrewed, warmed up, and then adjusted. (So watch out, you may kill yourself if you are really unlucky.)
You also have to replace the large electrolytics resting on top of the amps every other year. They last for about 3-5000 hours. Better replace them in advance in the summertime, before the listning season begins.
And then there is the 8 ohm issue. Take that serious.
And to make it sound the best I can tell you right away: Run it balanced. Do not waste your time using singel ended preamps. It may sound sweet, but you loose the bottom end control.
The best combo I have heard is the GM 20 and the GM13.5B. That is magic.
I also sounds very good if u run it balanced from a Wadia CD player.

But as of January this year, Graaf does not make it any more, so if you want one, you better hunt down a used one. (And then look for the newer types with metal bars on the tube pins. Look inside.) On the older ones, the PCB tends to be destroyed around the tube sockets due to the heat.

I have learned to live with the "trouble". I do most of the service work myself, so I don´t have to ship it away for repairs. Then it works very reliable. I use to say that if you own and drive a Ferrari, you don´t take it to the garage for service with a two year interval. A race car needs service more often to work reliable. But then again, driving a Ferrari is certainly not the same as driving a SUV.

So until I hear something that equals my GM20, that is my dream amp and it rests in my living room.

(Forgive my bad inglish, it is not my native language :-)

Theo

I had a Graff GM 100 that replaced a Symphonic Line RG1.The Graff was replaced by Chapter Audio.Go to Chapter Two power amplifier review:
Eye Fi Magazine, Norway Summer 2002-it is on the Chapter Audio website

The reviewer also repalced his reference GM 100 with the Chapter Audio Chapter Two amp.