Unitra Kleopatra Amplifier: Broken Resistor in Right Channel - Resistor 308, 1k Ohm?

Question

I have an amplifier from the Unitra Kleopatra set. The right channel doesn't work for me. After opening it, it turned out that in some place the resistor broke (in the photo), maybe someone had already opened it and tried to fix something. Looking at the diagram (below) it seems to me that it is a resistor number 308 - 1k ohm. The problem is that I am just starting my adventure with electronics and I would rather not risk anything and ask for help on this forum

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marekhab · Answer

The resistor number is described on the laminate, if I can see correctly it is actually R308 (the photo reflects the light from the laminate a little bit slightly).
Read the resistor number from the PCB and choose according to the diagram.
I suggest to connect the amplifier to the network in series with the bulb and also measure the voltages on the damaged channel, compare with the voltages given in the diagram.

Search on the net "first launch of the amplifier"

398216 Usunięty · Answer

And not R318? Check what the resistor legs were connected to and compare with the diagram, and then you will be 100% sure what the resistor is.

000andrzej · Answer

See a similar layout in the adjacent channel. Even if it is R318, after inserting and without checking the entire system, it can give up the ghost again. If it's really 318, then all the final stage transistors to check. I bet one of them T2, T4, T218, T220 is crazy. And that means more trouble for the beginner.

wojtek 9007 · Answer

Hello - this is R318 - here is the photo;

Jan.Dziewulski · Answer

You think I can replace this resistor with the one in the picture ->

, I don't know too much what is the difference between the cream one and the green one, unfortunately I didn't find exactly 160 ohms only 150 ohms. Picture of green r318:

Added after 2 [hours] 29 [minutes]:

I replaced these resistors. There is a sound on the right channel, but a new problem has emerged - it sounds very soft and crackles ... What to do? It seems to me that some capacitors are to blame?

Added after 33 [minutes]:

The resistor has just burnt ... I don't know ... maybe I gave it too weak?

000andrzej · Answer

Go back a few posts before what I wrote to you.

wkret · Answer

Resistance R 318 is 180 Ohm, it can be seen in the diagram as 0.5 W.

398216 Usunięty · Answer

And if it burned, I would still check if the transistor cooperating with it is still working.

Unitra Kleopatra Amplifier: Broken Resistor in Right Channel - Resistor 308, 1k Ohm?

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