I recently found a Piper (Garnet) 2 x 6V6 amp. In another thread I was told the output transformer is very small. I installed a Celestion 70/80 speaker I had laying around and it sounds way better than the Marsland it replaced. I played the amp at gig levels, up to eight on the dial, for an hour with no problems. Later I realized that the Celestion is 16 ohms and the Marsland is 8 ohms. As I said it worked fine at high volume for an hour. Am I risking damaging the amp if I continue to use the 16 ohm Celestion? I'm not worried about the tubes. They are easily replaced. The output transformer may be hard to come up with an original it it goes. There is a speaker extension jack but the impedance is not labelled on it so I'm assuming it is 8 ohm as well.