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I don’t know how to measure if it is 60hz or 120hz. It does not change with the volume pot except when i turn it all the way up the hum get louder

Ground pin 8 . It mean conmect pin 8 to the chassic right?

I have replaced all caps and some coupling caps but the Hum is still there

Hello. I have a AA-151 . It has really bad hum . Replaced 2 big can caps can help fix hum problem?

yes. It is already out and relay click.

Did you mean. Disconnected this white wire right?

I am sorry. I don’t understand what you mean. I found out the amp on right side have this problem

Hello. My problem is the P700 . When it connected the relay not working. Somebody please give me an idea.

this mean I will replace R414 Hello lary Inserting the R/C network means to replaced R141(15ohm, 5w) with 27ohm 3w right? Thank you.

Hello. I use rectron 600v 10A to replaced selenium rectier. The negative of c98 now at -26v. Any advice thanks. Lam

Hello ban. Minh co mot con sansui 2000. Nhung kenh ben trai nghe rat nho , phai mo max volume len moi nghe duoc mot chut nhung lai khong co bass gi het chi co tieng tep voi mid thoi. Ban co ranh ve van de nay khong. Xin huong dan gium. Cam on.

Before replaced flex cables on dolby board My 9090db has loud sound at Rec-2 position only ( both channel). And it has very weak sound at all other position. After replaced flex cables . Right channel has weak sound at Off position, but when I switch at Rec-2 position the right channel has loud...

Which board do you mention here? How do I test the signal througth that pcb. Thank you.

I have the same issue. My 9090db has very slight sound at ( dolby fm, play, off, rec-1) position, but it has normal sound at rec-2 position of dolby system. I did a lot of dioxit, but nothing changed. Anyone give me an idea. Thank.