Bottlehead Kits > Crack-a-two-a
Lost sound in the right channel [resolved]
TheRedMantra:
👍
TheRedMantra:
I chopstick tested and it seemed that the issue moved all around from almost every connection out of the balance pot. I ended up cleaning and redoing all of the joints. Still the same issue. I invited a friend over this morning who does professional custom audio installations for a living. He examined it and is also convinced it is the balance pot. I’m no expert, but he is.
It’s worked perfectly for many months. I’m not sure what else I can explore beyond installing the 2 Quiet Attenuator that I have. I don’t want to complicate the circuit more if that isn’t the issue, but I don’t know what other options make sense.
Paul Birkeland:
You could scrape off all the connections from the lugs of the balance pot into the balance pot itself on the right channel and the signal wouldn't drop out. If solder has flowed into the pot, there's some chance of the signal shorting out. Part of the problem is that if the issue is around the selector switch and you install the attenuator upgrade, you'll have to go back and debug the issue anyway.
TheRedMantra:
I chopstick tested again; and this time the noise migration/stabilization happened in the volume pot at two points. I redid the connections and did a resistance check. 5 dropped to 31.5ohm and 15 to 31.7ohm. Is it possible I damaged one of the 33kohm resistors? No clue how to get the resistance figures back in line.
Paul Birkeland:
The 33.1K resistors could go totally open or dead shorted and you still wouldn't lose a channel.
5 and 15 are the outputs of the C2A that feed the headphone jack, which is on the complete opposite end of the circuit from the volume and balance pots. These resistance readings are the 2.49K resistors across the headphone jack. If you are measuring 30 ohms at those points, you probably have headphones plugged in.
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