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Model 66b Low Volume
bob913
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Joined: Feb 2010
#1

04-28-2010, 11:31 AM
Replaced 3 electrolytic caps, 6 paper caps and 6 resistors. All tubes test good. Followed the Rider’s 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?
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Ron Ramirez
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City: Ferdinand State, Province, Country: Indiana
#2

04-28-2010, 12:58 PM
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.
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Ron Ramirez
Ferdinand IN
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bob913
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#3

04-28-2010, 02:13 PM
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, I’m not sure which terminals to check for continuity. Also, the Riders schematic info I have does not give resistance values for the coils.
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bob913
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Posts: 13
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#4

04-29-2010, 01:04 PM
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. I’ve noticed these pop sounds before and they seem to be associated with changes in volume?
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