power amplifier DB audio

Good Day Mga Sis,

Please help me with my power amplifier.When i turn the volume up,output transistor always gets busted,including transistor 2n5551 and resistors.Fuses are okay.May problema po ba ang power supply at ang pre-amp?Thank you all.

Things that i did:

i replace all the resistor,transistor na 2n5551,output transsitor.When i turn the volume up sunog na naman ang resistor at sira na rin yung output transistor.Kung 1/4 lang volume ko di naman masisira yung unit. 

pwede siguro sis sira ang spkr.. na try mo na e check baka sobrang mabigat na ang reading (very low resistance almost short).. or minsan naman sumasayad na voice coil... 

or else out bias iyan.. kaya nasusunog

sis ultrasonic okay naman po yung speaker..tama ang resistance niya at hindi rin sumasayad ang voice coil niya..check ko po yung biasing na sinasabi mo..thank sa info sir..

ilan ang idling current /bias current mo?

@sir danny,sir ano po yung idling at bias current?paano e measure yan sa analog tester?sorry po sir danny baguhan pa lang po ako.salamat.

Getting Bias Current of an Output Transistor of an Amplifier Circuit

Biasing in electronics is the method of establishing predetermined voltages or currents at various points of an electronic circuit to set an appropriate operating point. The operating point of a device, also known as bias point, quiescent point, or Q-point, is the steady-state operating condition of an active device (a transistor or vacuum tube) with no input signal applied.

 

@Hertz,thank you po dito sir,+1 po sa iyo.dagdag kaalaman po.

mga sis next week pa ako maka update nito.salamat.

musta ito master triac?

update ko lang ito mga sis..okay na po ang unit..

defective parts A940 & C2073 leaky po ito mga sis..at isa pa sa bangongot ko,nakabili ako ng mga transistor na leaky rin pala.Thanks master electro..sir hertz,sir ultra,at sir danny +1 po sa inyong lahat

Oy congratz Sis

kapihan na pala ito