I'd originally started looking at R560. It's about 68k in mine. Not really sure how critical that is and I think at most it might have some effect on the AGC time constant.
I'm pretty sure now, though, that the "mystery" component is a 470 ohm resistor. Another list member sent a picture of a couple of his IF modules and one is clearly 470 ohms. That last band is brown instead of orange. Mine is checking a bit over 500 so probably good enough as-is. Odd, though, that they used one of the "older" style resistors there. That's what threw me off more than anything. Thanks, Barry - N4BUQ On Sun, Oct 13, 2024 at 8:41 PM Jacques Fortin <[email protected]> wrote: > > Barry, > That "mystery" component is R553. > From your picture, a 1W, 47K ohms, 10% IRC brand resistor (maybe not the > original one, but who knows ??). > It connects the 180V supply to the screen grid of V509. > R560 (56K ohms) can be seen in the same picture. > > 73, Jacques, VE2JFE in Montreal > > -----Message d'origine----- > De : [email protected] <[email protected]> De la part > de Barry > Envoyé : 13 octobre 2024 18:15 > À : R-390 Mailing List <[email protected]> > Objet : [R-390] Mystery Component > > Maybe not really a “mystery” but I can’t identify the dark brown cylinder > with one yellow and two brown(?) stripes in the AGC time-constant compartment > in my R-490/URR. A 410-ohm resistor? > > If those are actually violet stripes then I’m even more confused. Anyone > know? > > > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
