Intermittent Loss of R channel [resolved]

[suttonri]

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

 

[Paul Birkeland]

By B3 tab, do you mean the tube socket pin on the octal socket? 

 

[suttonri]

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

 

[Paul Birkeland]

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.

 

[suttonri]

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