Help with rockford 851s

[stoke]

first i was looking for some distortion on the left channel and by mistake i change a lil bit the position of rv405 and some power supply transistor get burn, now i changed those transistor and need to put rv405 and rv404 in the default position.. need to know how

 

[Perry Babin]

I don't have any information on this amp but I assume that these are the bias potentiometers. Start with them in the fully counter-clockwise position. All of the transistors must be tightly clamped to the heatsink before you make any adjustments. The power line should have either a current limiter or a 10 amp fuse.

Does your 12v power supply have an amp meter.

 

[stoke]

i have the bais pot on the counter-clockwise top position. now both channel work but the sound is not god quality .. what i can do

 

[Perry Babin]

Are both channels distorted?

 

[stoke]

Yes

 

[Perry Babin]

Do you have both positive and negative 15v on the power supply pins of all op-amps?

Do you have both positive and negative rail voltage on the outputs of both channels?

 

[stoke]

yes i have 15v on the power supply pins of all op-amps. and it dosent get loud with volume and gain on top. when i touch the back of the rca i dosent produce any sound but i can just hear the music very low and distorted

 

[Perry Babin]

Do you have both positive and negative 15v on the power supply pins of all op-amps?

Do you have both positive and negative rail voltage on the outputs of both channels?

 

[stoke]

im using 800a2 schematic and they look to be the same board of 851s, i got the 17v from pin 8 and 4 together of all op amps

 

[stoke]

i replace u100 and u103 and the problem is still present

 

[stoke]

i found an op-amp with 17v in all pins. that's not normal?

 

[Perry Babin]

What's the DC voltage on all 3 pins of the LM337?

Place the black meter probe on the amplifier's ground terminal. Place the red meter probe on the point where you need to measure the voltage.

 

[stoke]

im using 800a2 schematic and they look to be the same board of 851s, i got the 17v from pin 8 and 4 together of all op amps

i made a mistake the measure was 17v on pin 8 and -17v on pin 4 . now after replace U402 i can get louder but distorted

 

[Perry Babin]

Do ALL of the op-amps currently have both positive and negative voltage on their power supply pins (4 and 8)?

Do ANY of the op-amps have more than a fraction of a volt (DC) on any of the other pins (other than 4 and 8)?

 

[stoke]

right now all the op amps have the same voltage on their power supply pins and there´s no volt on other any other pin

 

[Perry Babin]

Are both channels distorted?

 

[stoke]

yes both channel, but one more than the other because i found a broken capacitor next to a op-amps and i taked out. but both have the same distortion

 

[Perry Babin]

Do you have an oscilloscope or a signal tracer (Radio Shack mini-amplifier, etc...)?

 

[stoke]

no, i don't have any

 

[Perry Babin]

Did you ever confirm that you have both positive and negative rail voltage on the outputs?