Heya,
I searched high and low to see if I could find the exact issue I'm running into with the exact kit.
I've assembled the China 6J1 tube preamp that's a fairly popular DIY kit. I've tried everything that I can think of, but I cannot get it to function 100%. There's a rhythmic popping noise that comes through the speakers. I turn the preamp on, everything's fine (music comes through perfectly), but after around 10 seconds, there's a POP, POP, POP noise that starts up and never stops. The noise is constant, regardless of where the volume knob is set. Oddly, the popping cadence increases slightly the higher the volume knob is turned.
The power adapter is AC 12v 1200mA, right on the money. I've already tried replacing both tubes and re-flowing all the joints. Nothing is helping, and there is no change in the behavior.
I'm at a loss. Do you have any ideas as to what may be causing this? This is my second DIY kit so I may take some moments to get the right info for any followup questions you might have. Thanks!
I searched high and low to see if I could find the exact issue I'm running into with the exact kit.
I've assembled the China 6J1 tube preamp that's a fairly popular DIY kit. I've tried everything that I can think of, but I cannot get it to function 100%. There's a rhythmic popping noise that comes through the speakers. I turn the preamp on, everything's fine (music comes through perfectly), but after around 10 seconds, there's a POP, POP, POP noise that starts up and never stops. The noise is constant, regardless of where the volume knob is set. Oddly, the popping cadence increases slightly the higher the volume knob is turned.
The power adapter is AC 12v 1200mA, right on the money. I've already tried replacing both tubes and re-flowing all the joints. Nothing is helping, and there is no change in the behavior.
I'm at a loss. Do you have any ideas as to what may be causing this? This is my second DIY kit so I may take some moments to get the right info for any followup questions you might have. Thanks!
Sure thing.
An externally hosted image should be here but it was not working when we last tested it.
Is it the output muting relay that is turning on and off?
Check both of the 12V regulator outputs.
Check both of the 12V regulator outputs.
You might have to school me a little bit on this one. 🙁 Bought this kit to learn more about electronics but I'm still a beginner. Which of these components will the regulator outputs appear like, visually?
(If this is a little too basic level for this forum just let me know, we can stop and I'll completely understand.)
(If this is a little too basic level for this forum just let me know, we can stop and I'll completely understand.)