10-12-2016, 11:10 AM
I have now completed it by adding the label, and photographing it in daylight. As I have said (twice) this unit is for use in "small valve receivers," and by that, I mean one or two valves. Once you get into 3 valves, they should drive a loudspeaker. The "small receivers" that I am talking about, work on 45 Volts HT. In any case, I really don't see how I would end up with even 45 Volts "across my head," if the transformer failed. If the primary went o/c, the receiver would stop working, if the secondary went o/c, the receiver would stop working! If the primary and secondary both went o/c and by a million to 1 chance the ends connected across, connecting the low impedance headphones straight into the anode circuit, the headphones may burn out, but even then, I cannot see how I would get 45 Volts "across my head," because the headphones are made of plastic, and the wires insulated. I am not so much a dinosaur as to use the old-fashioned headphones that had exposed terminals on the outside of each earpiece! This unit should not be used on mains sets! In the interests of safety, don't build one if you don't think it is safe.
Bob
Bob
