The output transformer of a tube amplifier take care the speakers impedance is transformed to an optimum impedance load for the power tubes. When an 8 ohm speaker is connected to the 8 ohm output it most of the time sound best and power is optimum. When a higher impedance is connected to a lower output (ie 8 ohm to 4 ohm, or 16 ohms to 8 ohms) this means the tube "feels" a higher load, making it more lineair most of the time. However, also power halves, because the load is not optimum anymore (amplifier will clip on maximum output voltage). You have to try if it sounds ok. If a lower load is connected to a higher impedance (ie 4 ohm to 8 ohm output) a tube will "feel" a lower load, it will be less lineair (higher current swing), and clip on current, power also will be less. This connection is not better most of the time, amp will run out of breath very fast. Both situations will not damage a well designed amplifier. In both casus sometimes commercial amplifiers can loose their stability, Pink Faun amplifiers will always be stable and cannot be damaged at any connection.

At anytime you should not touch the glass of the tube during operation. The glass will be very hot and it can burn fingers. Best is to run the amplifier with clean tubes, when tubes are changed it is best to use a dry clean cotton cloth. When tubes are greased with fingerprints, it is best to clean them with cleaning alcohol or something else removing grease from the glass.