Quote:
Originally Posted by Phil Nelson
Sure I can measure. The parts are supposed to arrive in a few days.
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Here's the data sheet for the 4.5-MHz trap:
The sheet identifies that as a 47-mmf cap. Two of my traps have a 47-mmf cap and the third has a 45-mmf cap. They all measure 2.2 ohms across the coil:
I put one of them on a scope with a 4.5-MHz signal and was able to peak the amplitude by turning the adjuster. I don't know if that's where you want the adjustment to be in the preamp, but I was curious.
Haven't done much beyond that inspection, except to collect the needed parts. Perhaps I will create a new thread about building the preamp.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html