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Often times hum comes from the tubes. They can be subject to all kinds of harmonics. After the tubes it gets complicated. A bad shielded cable can do the same and a bad solder connection too. Then...

Most of that stuff should have modern equivalents even though you don't see handwired stuff anymore. The tubes may be the harder part. They can be sourced but they can be very expensive.

You'll...

That takes me back to my younger days when I used to build Hi Fi Equipment kits before printed circuits came to be.

That's a really simple circuit there. Just basic components.

Tape has much improved over the years starting with acetate that broke by looking at it too long to plastic and mylar and better methods to load up the tape with layers of iron oxide.

Don't forget...

It's really kind of a precursor to a tape recorder. The principle is similar, magnetic particles on a medium. Of course tape is far better than a wire.

This format has all kinds of issues because...