Hi,everyone.
Finally,I found the cause of hum!
It was　because of the power trans's direction.
Now,I'm wondering whether I buy a new trans or dispose this as a junk amp.mmm,,,it's difficult question..
Search found 4 matches
- Wed Jan 11, 2012 3:36 pm
- Forum: Technical Discussion
- Topic: Gibson GA-15RVT How can I eliminate hum noise?
- Replies: 16
- Views: 6139
- Sun Jan 08, 2012 7:46 pm
- Forum: Technical Discussion
- Topic: Gibson GA-15RVT How can I eliminate hum noise?
- Replies: 16
- Views: 6139
Re: Gibson GA-15RVT How can I eliminate hum noise?
Thank you everyone!I really appreciate. Phil_S "Try moving the ground for the CT of the interstage tranformer~" This reduced some hum,but still hum noise noticeable/annoying,,, Lynxtrap "Is the hum ac or dc? That's the first clue to finding the source." I'm not sure,,,but the noise sounds like [vu~~...
- Sun Jan 08, 2012 7:46 am
- Forum: Technical Discussion
- Topic: Gibson GA-15RVT How can I eliminate hum noise?
- Replies: 16
- Views: 6139
Re: Gibson GA-15RVT How can I eliminate hum noise?
Structo
Thank you for advice!
I bought 100ohm*2 and try center tap,,,,,,no difference,,,,lol
Also I tried change the electric/sound lead line,and,,,,,no difference.
Maybe this hum is nature of this amp?
Now,I'm bewildered~~
Thank you for advice!
I bought 100ohm*2 and try center tap,,,,,,no difference,,,,lol
Also I tried change the electric/sound lead line,and,,,,,no difference.
Maybe this hum is nature of this amp?
Now,I'm bewildered~~
- Sat Jan 07, 2012 2:41 pm
- Forum: Technical Discussion
- Topic: Gibson GA-15RVT How can I eliminate hum noise?
- Replies: 16
- Views: 6139
Gibson GA-15RVT How can I eliminate hum noise?
Hi,there. I'm posting this topic from Japan. Recently,I got this amp as a broken,and I think I fixed it. I replaced filter cap (20uf ATOM)/resistor(270ohm,130ohm)/diode. But there's still big hum noise!!Very annoying. Hum is always big,not depend on the loudness(or volume). Does anyone can solve thi...