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Stereo to Mono DIY cable to connect music player / iPhone to tube radio.
A quick look at how to build a good stereo to mono converter cable, that is more than simply a Y-cable that is often suggested on the web.
In most tube radios you can use the Pickup (gramophone) input to play your music player or iPhone through. These old radios usually produce very good sound, with some having an impressive array of speakers in beefy wooden cabinets that will fill your room with bass. The PU input lets you use them as an amplifier and speaker system in one, for your favourite music source.
The challenge is that they normally have two sockets at the back for your input, one being the Signal (mono) and the other the Ground. Normal 4mm banana plugs usually fit so we need to doctor our cable a little.
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