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FERNSEH · 3rd Mar 2018, 10:14 pm

Seems strange that the frame aerial tuning capacitor tunes in stations and yet the oscillator tuning does nothing. However, the receiver might not employ a separate oscillator valve. The attachment shows the circuit of a self oscillating mixer which employs the Mullard bi-grid valve type PM1DG.

DFWB.

3rd Mar 2018, 10:14 pm	#6
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: Supersonic Heterodyne radio 1920's. Seems strange that the frame aerial tuning capacitor tunes in stations and yet the oscillator tuning does nothing. However, the receiver might not employ a separate oscillator valve. The attachment shows the circuit of a self oscillating mixer which employs the Mullard bi-grid valve type PM1DG. DFWB. Attached Thumbnails