Pflugshaupt
New member
Problem solved! In the end it was the same thing I read many times on this forum. I had a bad solder connection on one ground connection.
This is how I figured it out: I connected the reduction with an audio interface because I wanted to measure the hum to show it here. I made some rca plugs to short the inputs. While I set up everything to do a frequency plot I noted there was no hum when I had just the left channel connected to the audio interface. Then I tried connecting only the right channel and I got a crazy loud hum. With both channels I got hum on left and right, but more on the right as I wrote before. So I thought something was wrong with grounding just on the right channel and did a reflow of all solder joints on the right part. This has eliminated the hum completely and now I just hear faint tube hiss which I'm more than happy to have. As the problem was not extreme to begin with I guess one of my solder joints was not fully conductive. I believe it probably was the one where the three caps and the black twisted wire going to the right output are connected. Or maybe the difficult to solder ground post connection (Even with the post totally disassembled I had some troubles getting a good temp and flow there).
Finally things are as awesome as I hoped when I bought the kit and now I need to go and listen to some records! Thanks for all the help!
This is how I figured it out: I connected the reduction with an audio interface because I wanted to measure the hum to show it here. I made some rca plugs to short the inputs. While I set up everything to do a frequency plot I noted there was no hum when I had just the left channel connected to the audio interface. Then I tried connecting only the right channel and I got a crazy loud hum. With both channels I got hum on left and right, but more on the right as I wrote before. So I thought something was wrong with grounding just on the right channel and did a reflow of all solder joints on the right part. This has eliminated the hum completely and now I just hear faint tube hiss which I'm more than happy to have. As the problem was not extreme to begin with I guess one of my solder joints was not fully conductive. I believe it probably was the one where the three caps and the black twisted wire going to the right output are connected. Or maybe the difficult to solder ground post connection (Even with the post totally disassembled I had some troubles getting a good temp and flow there).
Finally things are as awesome as I hoped when I bought the kit and now I need to go and listen to some records! Thanks for all the help!
