Resistance Checks help

[Deke609]

Deltaray - Sorry to hear about your channel imbalance issue.

I took a quick glance at your photos.  Your wiring layout appears pretty good, but some of the solder joints are iffy.

20 and 21 look like classic cold solder joints.  I would try reheating both of them until all the solder turns liquid, and then leave the soldering iron on them another 1-2 seconds or so until you see the solder flow into the joint.

I wonder whether the soldering issues are a function of your soldering iron? If your are using an iron with a large chisel point (or any large tip), that could make it difficult to make good contact. Unfortunately, most single-tip fixed wattage soldering irons come with such tips. I find large-tipped soldering points unusable for projects like this and instead use a soldering tip that is no more than 2mm (approx. 1/16 inch) wide at the tip.  It works great.

Hope you getting it working soon.

 

[Paul Birkeland]

I'd be interested in seeing the joints on your headphone jack.

OA and OB on the front board do not need to match.  Having said that, if one value is way, way different than the other, then that could indicated that half of the 12AU7 isn't functioning properly, but your voltages are spot on.

 

[deltaray]

Sure. I've added the RCAs in case you may want to look at them.

Thank you!

 

[deltaray]

Turns out the culprit here was the ge 6080 tube. I managed to get my hands on a tungsol 6080. I did an ABA and it was quite apparent, that the ge one was a bit off centred to the left!

 

[Paul Birkeland]

Are you sure that these terminals aren't touching?

In the past, we have seen folks replace tubes, declare an issue resolved, the return later when the issue reappeared with the different tube.  Often times the act of removing and reinserting a tube into a socket can nudge a loose connection enough to get things working properly for a short time.

-PB

 

[deltaray]

yes, they are not touching, in fact the image above that image you have taken to circle would show that they are not connected. I am post two more image for clarity.

as for the tubes, i have swapped them about repeatedly to do this comparison.

I have already posted some images on the voltage measurements and images of the board above, so do let me know if i need to furnish more information.