23-12-2016, 05:38 PM
The problem here is I'm used to the basic 1930's to 1950's valve schematics. These are very standard circuits with Mixer, IF amplifier, Double diode and output. Gain control is used but these are seldom that complicated. There wasn't even any printed circuit involved so, at the moment, I don't feel I have any problem at all understanding 1950's valve schematics, or indeed radios.
Nevertheless, once we get into PCB boards and FM boards on Philips valve radios or German makes, I must admit I feel the strain a bit. Also, looking at this Riga diagram I must confess I haven't got a clue.
I've only recently gotten used to segmented American diagrams where they would split the valve in the diagram. For example, showing the oscillator circuit apart from the mixer (both as if distinct valves).
This diagram feels a bit advanced for me at present but can anyone suggest which one (of the three) is the best? The good thing about the early 1950's valve sets is the whole schematic would be just one basic diagram with a commentary for each stage.
Nevertheless, once we get into PCB boards and FM boards on Philips valve radios or German makes, I must admit I feel the strain a bit. Also, looking at this Riga diagram I must confess I haven't got a clue.
I've only recently gotten used to segmented American diagrams where they would split the valve in the diagram. For example, showing the oscillator circuit apart from the mixer (both as if distinct valves). This diagram feels a bit advanced for me at present but can anyone suggest which one (of the three) is the best? The good thing about the early 1950's valve sets is the whole schematic would be just one basic diagram with a commentary for each stage.
