This is just a quick one. I said in my previous post that the signal produced by the tape head was too small to read using my oscilloscope. I put together a simple op-amp circuit with about 100x gain and measured the output to see what it would be like. It worked pretty nicely:
The signal looked a little noisy so I hooked the output up to my guitar amplifier and it sounded pretty good! At least as good as the sound coming out of the speaker in the tape player I took the tape head from. I’m feeling pretty optimistic about this bit.