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I was 13 when the Spectrum 48k came out.

I was a bit of an electronics tinker back then.

At 14, I worked out what frequencies were used on the tapes, and built an in-line multi frequency band pass filter to try and remove background noise between the tape player and recorder.

Took a while to sort it out, but once done, made perfect 'backup' copies of games :-)

Happy days, although Manic Miner background music still haunts me to this day!