Big dish,
The Zero transformer will allow your 13 watt SET amplifier to drive a higher impedance thus an easier load for it to drive. I use an 8 watt SET amplifier driving 14 ohm load speakers and it’s an ideal match.
I believe that in your case a 845 SET with a very good power supply and quality output transformer with 4 ohms speaker taps would be sucessful for your desire to have excellent SET performance.
Charles
The Zero transformer will allow your 13 watt SET amplifier to drive a higher impedance thus an easier load for it to drive. I use an 8 watt SET amplifier driving 14 ohm load speakers and it’s an ideal match.
I believe that in your case a 845 SET with a very good power supply and quality output transformer with 4 ohms speaker taps would be sucessful for your desire to have excellent SET performance.
Charles