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McMartin AM tuner

It works.
I replaced all the old electrolytic caps.
I did not replace the ceramic discs.
It's possible I should re-tune the circuit.....but I don't know how. I could mark the position of the variable caps, and try tweaking them.

I just need to get/make an antenna. With a 75 to 300 ohm adapter a straight piece of 10' wire hanging above my desk gives poor/average results, but my finger on one terminal is better. There is still some high frequency whine. (no fluorescent lights here)
I have nothing else to compare it to, so I can't tell you if it's better or worse than brand "x".

Check out this guy's crystal receivers...

http://schmarder.com/radios/crystal/index.htm


=FB=
 
I believe I have one of the old McMartin EBS crystal receivers but I believe mine is FM. (Wood grain and all!)

RR

8)
 
Freq Band said:
It works.
I replaced all the old electrolytic caps.
I did not replace the ceramic discs.
It's possible I should re-tune the circuit.....but I don't know how. I could mark the position of the variable caps, and try tweaking them.

I just need to get/make an antenna. With a 75 to 300 ohm adapter a straight piece of 10' wire hanging above my desk gives poor/average results, but my finger on one terminal is better. There is still some high frequency whine. (no fluorescent lights here)
I have nothing else to compare it to, so I can't tell you if it's better or worse than brand "x".

Check out this guy's crystal receivers...

http://schmarder.com/radios/crystal/index.htm


=FB=
Click to expand...

That 75 to 300 ohm adaptor is probably meant for VHF and won't work well for KFI on 0.64 MHz. You'd do better with a piece of wire at the end of a section of RG-58.

I really wouldn't tune around on that thing until you know what you've got. Somebody, somewhere has to have a schematic for it.

Do all you can with an antenna and see if you can get a good signal.
 
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