Rockford T2500 - 1BD

[Perry Babin]

What is the power supply? Link to owner's manual?

Pot, potentiometer.

 

[Albis2985]

I thought you were referring to another source of energy different from the one I use to turn on the amplifiers, I can get a 9v battery or I don't know if it works for me, the one that brings my soldering station is a 853d yihua

 

[Perry Babin]

A 9v battery is the last resort.

What is your other power supply?

 

[Albis2985]

My soldering station brings it incorporated

 

[Perry Babin]

I don't want to risk the supply in the soldering station.

What I want is to have you desolder the center legs of the rectifiers and use something other than the rail voltage to power the outputs. A power supply that's adjustable would be ideal but something like a battery would work. I'm not 100% sure that the test I want to try will be of any use so don't go to any expense if you don't have anything.

You can't make a low-voltage jig to use with this amp because the transformers have no space under them. If you had a junker amp with a working power supply, you could make and use one with that.

 

[Albis2985]

Ok I have this relic maybe it works for me I don't know what you say

 

[Perry Babin]

From what little I could find, the secondary isn't isolated.

 

[Albis2985]

ok discarded the test then I take the amplifier to work at home I will concentrate only on it and any questions or concerns I write it

 

[Albis2985]

Good morning Perry you were right about the signal was the master slave switch, I found a tl072 that gets quite hot on the EQ card and I also found that R9 was exchanged with one of the mosfet resistors since in the mosfet I have in all 5 ohm resistors 5 watts and there is a 30 ohm resistor I think it is the value of R9 or am I wrong?

 

[Perry Babin]

Any op-amp used for audio that getting really hot is likely defective.

R9 is 30 ohms in amps where the 30 ohm resistor is used. In later versions, the source for the low-voltage regulators was u1000 and R30 was omitted.

 

[Albis2985]

ok then if it was exchanged the 30 was in the area of ​​the output and R9 had 5 ohms I will change both because they have broken pins and I will change the tl072c and see what happens with the amplifier

 

[Albis2985]

Good morning Perry I changed the Ic tl072 of the eq card but it continues to heat even with the new ic.
Will it be defective or what else should I check?

 

[Perry Babin]

What's the IC driving? There is no reason for an audio op-amp to heat significantly.

Are any of the other TL072s heating up?

 

[Albis2985]

The integrated op amp that heats up is u1 of the image and is the only one that heats up the others are fresh

 

[Perry Babin]

Are any pins in the telco jack shorted together?

 

[Albis2985]

there is nothing short in jack telco

 

[Albis2985]

Good morning Perry, I continue with this amplifier that has become a challenge, I took out the slave master switch and stopped heating the tl072 of the EQ card, when I slide my finger on the ic lm6172 (U205) the yellow LED stops blinking and Activate the signal at the door of the output mosfet, will the IC be defective? I reviewed the weld but nothing stays the same. I also noticed that without the mosfet output I have a signal that reaches the mosfet door, is there anything else I am not checking or would you suggest changing this amplifier?

 

[Perry Babin]

I must have misunderstood I thought you already replaced the TL072.

 

[Albis2985]

If I replaced it but it kept getting warm and that was when I pulled out the master slave switch that stopped

 

[Perry Babin]

Was it getting hot with no signal?

Is there some DC voltage feeding back into the TL072 from the switch?