Strange sound in my amplifier

[Danilewicz]

Hi!
Actually I'm making my guitar amplifier. It has 2 channels + booster. Clean - Bandmaster, Overdrive - AC30 and booster - EF86. I've wired ?power amplifier? (I'm sorry, but I don't know how to call it in english), phase inverter, tremolo and booster. The problem is that sometimes amp makes strange sound, even if booster is unconnected. I've recorded it:
http://w991.wrzuta.pl/film/6y4KHOpvUgM/wzmak
When I disconnect jack on the back of amp i turn tremolo off. Guitar is connected. Do You know what is the reason of this problem?
Sorry for my english ;)

[stratele52]

You build an amplifier ?

You have schematic ?

[smackoj]

sounds to me like the tone killer called "motor boating" . Does the amp have a Negative Feedback Loop? Might try disconnecting NFB and see if she quits?

Good luck     

[stratele52]

Wiring lead dress ?

[Danilewicz]

Problem solved
It was dry joint in power supply. It was strange, because I could hear this sound not only from the speakers, but from the circuit too. It was tiny electric arc  
Thanks for reply.

[plexi50]

Wow! Good eyes and quick fix.

[stratele52]

And about my 2 questions ?

[Danilewicz]

1. I'm really sorry, but I don't understand what "Wiring lead dress" means  :/ Could You explain? Then I'll answer Your question ;)
2. Yes, I buid amp, but i don't know if I upload schematic.

[Willabe]

1. I'm really sorry, but I don't understand what "Wiring lead dress" means  :/ Could You explain?

Lead dress is how and where you run the wires to/from the tube scokets, pots, resistors, caps, switches, etc.


          Brad     

[stratele52]

Bad lead dress bring lots of problem , noise.........

[John]

Problem solved
It was dry joint in power supply. It was strange, because I could hear this sound not only from the speakers, but from the circuit too. It was tiny electric arc  
Thanks for reply.