Quote:
Originally Posted by avocollector
Use to have an old Phillips valve radio with a gram input and fed the guitar through that in my younger days - even though it had a proper transformer the grid cap was a bit leaky so after an hour or so you got a slight tickle off the strings!! Would not reccomend it BUT one possiblity is a Practical Electronics circuit from years ago that used optical isolation - the receiving side was an ORP 12 and preamp connected only to the main amp while the transmitting side used a small lamp(? might have been an led) and self contained powered amp circuit running off a PP3. The electrical isolation would be complete that way.
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A modern device to do the same job, complete with decent safety isolation specs (provided the build standard doesn't compromise them!).
https://www.digikey.co.uk/product-de...LA116-ND/96654