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CK2III help: Transistors spoiled?

post #1 of 4
12/9/10 at 7:41pm
Thread Starter 

 CK2III.PNG

I recently build a CK2III amp. However I think i damaged the transistors, can anyone help me verify that the transistors are indeed spoiled from the voltages in green?

The +15V and -15V test pads on the board are 15V and -15V respectively.

There is no sound produced when i plug in headphones to test.

Any help is greatly appreciated.

ck2_pcb.png


Edited by andrelim - 12/9/10 at 7:44pm
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post #2 of 4
12/31/10 at 5:15am

Hi, I hope you found already. From the picture I do not know, but I know that I have killed a  Q19. In this circuit it is easy to find, because no guarding or removal needed, you can measure them with a diode meter, in circuit.

 

Regards,

JG

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post #3 of 4
12/31/10 at 10:13am

Use this BJT sanity check tutorial to test all transistors (except Q1 to Q4).

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post #4 of 4
1/2/11 at 7:02am

Check Q5+Q6 base-emitter "diode"

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