Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: suttonri on April 14, 2025, 04:39:22 AM
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I think I have this fixed. I would just like to get some explanation about what I observed. When the R channel was out, all *'d resistances, along with B3 read 0. I pushed on the B3 tab and got all resistances normal. I did not check voltages until B3 was restored. At that time all voltages were normal and both channels worked.
What was going on here? The only other thing I did was apply a little extra solder to the capacitor lead at terminal 7. It was a little wiggly.
Thx,
RS
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By B3 tab, do you mean the tube socket pin on the octal socket?
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Yes, B3 is on the tube socket. Once I nudged it, it's resistance went from zero to spec, and all the *'d resistances went back to spec and my right channel came back. I suppose it's good enough that it works, but I'm trying to learn something here. I don't really appreciate the signal path yet.
Thx,
RS
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I suspect there's a loose connection causing you some problems, but it would be very strange to see B3 at 0 ohms, unless possibly there's some debris or untrimmed leads touching things they shouldn't.
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It turned out to be the lower resistor on the phone jack. It was not soldered well.
That nonsense with B3 reading 0 resulted in my multimeter taking a few seconds to move off zero. It just happened to get to the proper resistance coincidentally with me giving the tab a nudge.
Close this one out. Love the amp! Right now I'm streaming Qobuz => Chord Qutest => Crack => Sennheiser HD 800S. Easily an endgame setup.sure there us something better but this will do nicely.
Thx
RS