Model 66b Low Volume - 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: Model 66b Low Volume (/showthread.php?tid=2360)
+- 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: Model 66b Low Volume (/showthread.php?tid=2360)
Model 66b Low Volume - bob913 - 04-28-2010
Replaced 3 electrolytic caps, 6 paper caps and 6 resistors. All tubes test good. Followed the Riderâs alignment instructions. Volume is weak using an 8 ft antenna wire. Touching a screwdriver to the top of the 6A7 tube, 1st detector oscillator, causes a significant increase in volume on the AM band (not on the SW band.) Any suggestions for increasing the volume?
Re: Model 66b Low Volume - Ron Ramirez - 04-28-2010
Sounds like a bad antenna coil to me. It will probably have to be rewound.
Do you have a multimeter? Check the continuity of that coil.
Re: Model 66b Low Volume - bob913 - 04-28-2010
I removed the antenna coil and did not see any green oxidation. I have since reinstalled the antenna coil. The coil seemed to have 4 different sets of windings and 6 terminal posts including the attaching bracket. However, Iâm not sure which terminals to check for continuity. Also, the Riders schematic info I have does not give resistance values for the coils.
Re: Model 66b Low Volume Update - bob913 - 04-29-2010
I noticed that when turning the radio on when cold, the volume was low. After a couple of minutes, the radio made a pop sound and then the volume was louder. Iâve noticed these pop sounds before and they seem to be associated with changes in volume?