Philco tropic - Printable Version
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco tropic (/showthread.php?tid=6147)
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco tropic (/showthread.php?tid=6147)
Philco tropic - Ronin61 - 03-06-2013
When I turn the volume control I hear a high pitched screeching sound. All capacitors have been replaced so what did I do wrong?
RE: Philco tropic - Steve Davis - 03-06-2013
Are all the tube shields in place?
Steve
RE: Philco tropic - morzh - 03-06-2013
You may have a positive feedback. As Steve just pointed out, this may be due to the coupling because of the missing shields. Or because of some other coupling. Messed up wiring will also get you that.
RE: Philco tropic - Ronin61 - 03-06-2013
The single tube shield is in place I'll check the wiring. By the way this is a philco tropic 3214.
RE: Philco tropic - codefox1 - 03-06-2013
Hope you took a few "before" pictures, and did not deviate with lead dress and component locations. Double check your values and connections one more time.
RE: Philco tropic - morzh - 03-06-2013
Check how you dressed the wires. If you decided to bundle some of them - unbundle them and try in general to avoid running wires in parallel for long distance.
If any were run next to the chassis before, keep them this way.
an idea: while having the screeching sound, try to move wires by touching them with an insulated rod of some sort, see if at some point when you touch some wires it disappears. This will give you and idea if there are some proxymities between some wires that should be avoided.