How many transistors are enough?

I'm not that technical. I'm a musician who just wants my system to sound as good as it can within my budget. To that end, I'm wondering about transistors in a solid state amplifier. Specifically, how many per channel is enough? I currently have a pair of mono-block amplifiers with six transistors each. I have been shopping around and have noticed that some amplifier manufacturers emphasize the number of transistors per channel. For example, a Parasound JC-5 touts 12 transistors per channel for a grand total of 24. Can someone please explain to me and to the other Audiogoners out there who may not know, what function does a transistor have in an amp and how many transistors is considered sufficient or optimal? Thank you in advance for your considered responses.