Melody Maker 1928
Housed in what can only be described as a black crackle painted biscuit tin, this is the Cossor Melody Maker home construction kit set of 1928.
The valves used are:
215SG Screen grid HF
The circuit is a fairly conventional TRF. Two tuning stages are used: the aerial circuit, and anode tuning for the HF stage. Waveband changing is by plug-in coils. The gain of the screen grid valve is controlled (unusually for a dull emitter) by a filament rheostat.
The detector is a leaky grid type with capacitative reaction. It is transformer coupled to the output valve. An external high impedance speaker, connected directly into the HT supply to the 220P, is required.
Go to the reference page.