Schematic for tube radio

On the simpler side of things (to understand) there are two approaches to consider - a simple diode or crystal radio with a one tube audio amplifier following - that could be more than one stage. Another approach might be to use the tube to amplify the RF prior to the detector (diode) stage. A tube with several sections might be used to do both - a tuned rf stage followed by amplification of the detected audio. I mention these as alternatives though the regen approach seems most popular.

Hi Nigel,

Thank you for your interest.
I just don't quite see the advantage of PLL over other circuits, yet.
Maybe their advantage is that they can be used for many purposes.

John

john1 said:

Hi Nigel,

Thank you for your interest.
I just don't quite see the advantage of PLL over other circuits, yet.
Maybe their advantage is that they can be used for many purposes.

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Again, you don't mention any circuits that you are thinking about?, but for a simple example - how about digital tuning of a radio?. It allows you to enter the exact frequency required, and it gives crystal controlled accuracy - something no other variable tuning system can.