CKKIII Help

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
I just built a CKKIII headphone amp, however I am experiencing various problems.
1. No sound output on the right channel.
2. Extremely distorted sound on the left channel.

The power part of my circuit seems to be working, the 15V and -15V test points measure 15.1V and -14.9V.

I am unable to get a consistent quiescent voltage on R23 and R47. It will jump from 0mV to 17-130mV.

I have the output transistors and they have heatsinks attached. I got some sound in the left channel after replacing them.

However almost no other voltage measures correctly.
An externally hosted image should be here but it was not working when we last tested it.


Any help is greatly appreciated.
 
are the green voltage values actual measurements of your circuit?

A working BJT should have ~600mVbe.
I can see many transistors that are turned off.
Now that you have some operation, can you repost voltage values, particularly Vbe of BJTs.

Inconsistent operation could be a sign of intermittent oscillation.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.