Oh Eric, we were having fun, ( not ) at your expense. Things have been boring all Summer and you livened up the threads.
For an honest answer to your question, the factory specifies that your Stargates are a transformer coupled parallel single-ended triode monobloc amplifier delivering 30 full Class A watts into 4, 8, and 16 ohm loads.
That means you need a reasonably efficient speaker, depending on your room size. There is a good chance you can drive Soundlab M2's and Vandersteen 5's with this amp. The Soundlab is more interested in voltage swing than high current, and the your amps 6C33 C tube is a high current device.
The Vandersteen has it's own powered sub, making it relatively easy to drive, especially considering its high performance. I have heard them powered by 18 watt tube SET amps with excellent results.
Last year at the CES, Stargates were used to drive Merlin TSMs and the sound was good in that room.