Quote:
Originally Posted by Hetrodyne
Can't quite understand why you are going to all this trouble, when the gram plug is inserted it opens S16 and puts R11 across the pickup as a load, suitable for a crystal cartridge as S17 closes taking the other side of R11 to chassis, at the same time muting the radio input via R12 by shorting the final IF. The aerial input could also be looped to chassis to stop any RF input. A shame it will never be used as a radio. A preferable way might have been to get a purpose made audio amplifier, and have use of this as a radio.
Usually to couple a stereo signal to a mono input is to feed through a couple of resistors of around 1K to 10K depending on the input level, joining the resistors at the mono end.
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Each to their own I guess - for me I like to listen to FM and I also like the visuals and history of an original bakelite radio. This combines the two
What you say about R11 being suitable for a crystal cart is interesting... I presume this is something to do with impedance matching. If I'm using a bluetooth device across the pick-up I presume R11 won't necessarily be optimal....
Also, what is the rationale behind adding resisters to the ends of each stereo input before joining them to the mono input?