chinsettawong

Have you tried resolder all the joints? If nothing helps, you might want to try recoating the diaphragm.

Happy belated birthday Birgir. Wish you could come to visit me in Bangkok someday.

Happy birthday!

Happy birthday!

Thank you so much for all your advices. I've finally fixed the problem. The C2M1000170 and 10M90S on my board have gone bad for some reasons. I replaced C2M1000170 with a SCT3080KLGC11 from a local store, and luckily it worked. I parallel the 5R with one more 5R, and now the power supply is working perfectly. The amp has been running for at least 2 hours with no problem. I couldn't have fixed it without your help, Kevin, Blueman2, and Soren. Thanks again.

The voltage was about 465V without load. Took out the 2n3904 and connected the amp board. Fired the amp up and the B+ became around -12V. Switched it off and the voltage gradually came up to around 45V then went down to 0. Can I try to change some R to increase the current limit a bit more instead of taking the 2n3904 out?

I need a little help here. When the amp is running, my B+ voltage keeps on swinging between 370-410V while B- is stable at 465V. Is my B+ supply running out of juice? What can I do to fix? I'm using this PS board.

Hope to see you in Bangkok, Thailand someday, Tyll! Enjoy your retirement.

Happy birthday Shelly!

Happy birthday Ari!

It sings! Thanks for all your advices. For some reasons, the silkscreen on my PCB asks for 250 ohm for tail resistors. I replace it with 120 ohm and now everything can be adjusted correctly. Now I need to work on the top cover. The amp sounds awesome.

Are these the two resistors that I should replace?

Thank you so much. I’ll try changing the tail resistors tonight.

I need a little help with my GG. I just can't adjust the offset of both channels below 50V for some reasons. The balance adjusts to zero just fine though. My PS is measured at 465V. The bias is set at 0.8V or 16mA.

Really nice build. Congratulations!