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Radio Broadcast
Radio Broadcast Photograph
FIG. 15
Simplicity in wiring is clearly indicated in this bottom view. It also shows the need for accuracy in layout, as there is not much room to spare for the sockets between the two brass brackets
]f there is the slightest trace of a highpitched singing noise, it is well to ground the negative side of the A battery and the cores of both audio-frequency transformers.
Where trouble is apt to be encountered, it is suggested that the constructor proceed first by re-checking the entire circuit diagram with the wired circuit of the unit. Sometimes it is possible that transformer windings are opencircuited or bypass condensers short-circuited. Be sure also that positive contact is made between the several blades of the jacks and that the filament switch is working correctly. Tube prongs may also be bent down too far,
preventing the tube from making contact with the socket blades.
From the several assembly and wiring photographs it will be seen that some leads have been passed through holes drilled for the purpose in the sub-base. Many of the leads running from the sub-base assembly to the panel pass through the narrow space between the sub-base and the rear of the sockets.
When enclosed in a suitable cabinet, this detector-amplifier in appearance will grace any installation and is admirably adapted for the special requirements of the experimenter.
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