03-02-2013, 11:10 AM
I was able to measure the leakage of all paper caps standing-off plate or screen voltages without disconnecting them. In all cases, there was a series resistor through which only the leakage current would flow, and across which the resulting voltage could be measured, with the set powered-up and maybe a tube pulled. I wasn't concerned with caps in low-voltage, low impedance circuits such as cathode bypass caps. After all, rolled caps with practically zero leakage probably didn't exist before polystyrene. The radio sounds MARVELOUS, much better than I thought possible with AM.
The idea for using, say silicone adhesive, to support the needle seems like a great one to me and I'm going to try it. I doubt that the needle needs to be centered exactly in the bracket and that only the mirror angle needs to be watched.
I doubt that the photo cell could cause bad sound quality though its sensitivity might be low. Remember that the line of light hitting it must straddle the edge of the window.
The idea for using, say silicone adhesive, to support the needle seems like a great one to me and I'm going to try it. I doubt that the needle needs to be centered exactly in the bracket and that only the mirror angle needs to be watched.
I doubt that the photo cell could cause bad sound quality though its sensitivity might be low. Remember that the line of light hitting it must straddle the edge of the window.
