2019-03-15 The Tape Recorder 6V6 Making Crackling Noise

from FB group Building Transistor Radios

Tuck Choy
I was a reel to reel tape recorder fanatic when I was a kid, and had a recorder with a 6V6 output to the spkr. The first thing I did was modify the recorder to add an external spkr. One time I plugged in a clip leads with no spkr. When I played back my recording I heard crackling noise inside. Well, that wasn’t supposed to happen, so I looked inside. The unloaded output transformer’s counter EMF was causing the plate pin of the 6V6 socket to arc to the chassis as the audio got louder! 😱😱😱

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