05-27-2019, 05:07 PM
I see that the dynatron oscillator was used in the Crosley 122.
I do not recall ever seeing a similar circuit in a Philco.
Some Philco sets used an autodyne oscillator circuit, in which feedback is obtained from a cathode winding coupled to the plate winding of the oscillator coil. This differs from the dynatron circuit which is dependent upon negative resistance (secondary emission) in early tetrode tubes such as the 24 instead of feedback.
Some Philcos that come to mind using the autodyne circuit are models 70 (late), 51, 52, 90 (late), 71, 91, 89 and 19.
But these do not use dynatron oscillator circuits.
I do not recall ever seeing a similar circuit in a Philco.
Some Philco sets used an autodyne oscillator circuit, in which feedback is obtained from a cathode winding coupled to the plate winding of the oscillator coil. This differs from the dynatron circuit which is dependent upon negative resistance (secondary emission) in early tetrode tubes such as the 24 instead of feedback.
Some Philcos that come to mind using the autodyne circuit are models 70 (late), 51, 52, 90 (late), 71, 91, 89 and 19.
But these do not use dynatron oscillator circuits.
--
Ron Ramirez
Ferdinand IN
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