03-01-2015, 06:09 PM
Some radio....
While resoldering electrolytics (wires cracked so I actually just put one right where the wires came from, and other needed a shorter single wire) I could not understand one wire coming to the solder post which came from dial lamps.
Obviously it was connected to the negative (xfmr centertap.)
http://www.nostalgiaair.org/PagesByModel...010931.pdf
But.
This sch shows a sepatate winding for that.
I think they rely on negative bias developed across the field coil and the divider to light th lamps!
Wow....
Well, I rewound the coil, put 33 turns and will try to see (if it comes to life) how the signal resonates.
PS. Kirk, dost thou have the speaker AND canst thou measure thy speaker's field coil resistance?
While resoldering electrolytics (wires cracked so I actually just put one right where the wires came from, and other needed a shorter single wire) I could not understand one wire coming to the solder post which came from dial lamps.
Obviously it was connected to the negative (xfmr centertap.)
http://www.nostalgiaair.org/PagesByModel...010931.pdf
But.
This sch shows a sepatate winding for that.
I think they rely on negative bias developed across the field coil and the divider to light th lamps!
Wow....
Well, I rewound the coil, put 33 turns and will try to see (if it comes to life) how the signal resonates.
PS. Kirk, dost thou have the speaker AND canst thou measure thy speaker's field coil resistance?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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