I don't have much experience with the GH (I have friends with other speakers from that manufacturer -- Anniversarios, Stardivari, Elipsa) and none of these were SET friendly. I heard the Anniversarios on a top quality pushpull 300B amp and even in pushpull configuration, the lack of bass control was very evident. I am a fan of lowpowered SET (I own an Audionote Kageki), but, these are extremely specialized items that should be used only on appropriate speakers.
The only kind of SET I would consider would be an amp using 845s or 211s because these put out significantly more power than a 300b. I have heard, and liked, the Viva Solista, though I have not heard them with Sonus Faber speakers. Another higher-powered SET that I like is the THE Wyetech amp that uses 211s (I believe it is called the Topaz).
I am also very partial to output transformerless amplifiers. These tend to be very fast and sound very lively and "present." I really like the immediacy of the OTL sound, something one can also get with certain SET amps (but only with very high efficiency speakers), but OTLs make that kind of sound available to a broader array of applications. Atmasphere makes OTLs at the 30 and 60 watt power levels that should be fine for your application. Joule makes OTLs that sound warmer than the Atmasphere models, if a warmer sound is what you want (the 300b sound is on the warmer side).
Good luck on your search.
The only kind of SET I would consider would be an amp using 845s or 211s because these put out significantly more power than a 300b. I have heard, and liked, the Viva Solista, though I have not heard them with Sonus Faber speakers. Another higher-powered SET that I like is the THE Wyetech amp that uses 211s (I believe it is called the Topaz).
I am also very partial to output transformerless amplifiers. These tend to be very fast and sound very lively and "present." I really like the immediacy of the OTL sound, something one can also get with certain SET amps (but only with very high efficiency speakers), but OTLs make that kind of sound available to a broader array of applications. Atmasphere makes OTLs at the 30 and 60 watt power levels that should be fine for your application. Joule makes OTLs that sound warmer than the Atmasphere models, if a warmer sound is what you want (the 300b sound is on the warmer side).
Good luck on your search.