Hello, Has anyone tried these amps allready? They are hybrid amps, but with a small (1 AX7 + 1 EL-84) tube power-amp build inside. The signal of the power tube is amplified by an additional MOSFET power amp. There's 400 watt version, a 600 watt version and a 900 watt version. I've never heard one before. Can somebody tell how they sound? Thanks!