I agree with Scott, 78s are spotty when it comes to fidelity. On the flip side, when you (or should I say 'I') listen to them, I'm not concerned with fidelity. I'm listening for the historic nature of them. Some artists and versions of songs will likely, never make it to vinyl or digital. Most of the 78s I have have pretty decent fidelity. Some are surprisingly good but you need a decent reproduction system to play them back.
Here's a pick of my 78 system
I've swapped out the old Stromberg Carlson amp for a HH Scott 99 (mono). The speaker is an Altec 824 and the table is a simple Dual 1019 with a Shure M78. Your amp needs to be able to EQ the various cuttings over the years. Back then, there were no standards so Columbia cut grooves with one EQ setting, Decca and others used something different and so on.
78's are a blast. Over the weekend, my brother and cousin were over and we spent a good part of the afternoon listening to old blues, jazz and pop music of the time. They are constantly amazed that 78s can sound so good.