Hi all,
Another possiblity (more affordable) are the cheap Macrovision fighters. I don't know any commercial name. His function is to reconstitute syncro signals altered by Macrovision system (anti-copy). Perhaps anyone can explain best this devices.
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maybe the RF output of the ZX81 changes impedance under load (when connected to non-TV input) and overloads the poor Z80
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The Z80A don't drive directly video out. Instead, via output ports send signal to other chip (the Uncommited Logic Array). Z80A do the timing (in a poor way). The load is suffered by the RF modulator. If isn't damaged, it must cope with a standard device.