This can be considered a complete laboratory for the repair professional. A full featured signal tracer with 13 tubes. The circuit is from the March 1946 issue of Radio Craft.
We find this circuit in an American 1980s documentation. The unijunction transistor may be the...
This circuit generates a pulse of duration determined by the capacitor when an object interrupts the...
This circuit, published in 1978, has an interesting function. In the 2 V test position, the...