I hv owned cd33 for a few years. And i hv moded some caps before. After intalled a pair of NOS GE5670 to it today. it played normally at first.
Then after some hours, i turned it on again and it started to distort and clip
heavily.
I am sure that the tubes are normal cause i trace back the distortion to the output pin of the opamp. And i assume the opamp should be normal because i measure the rail it was 30v.
What would be the source of the distortion? :?
Where should i test?
Last resort would be bring it to the dealer and the warranty was ended.......gonna cost me some....
There is a thread right above by K.K. Ho on the distortion of the CD 66 Player.
K K suggested changing the Zener diode on the Power Supply board. I have checked the voltage at that point as well; it exceeds the tolerence of the default Zener diode. This MAY be one cause of your distortion
yep. i can read it~~ XP
I hv measured the plate voltage ~80v should be fine. But thx anyway~~
I suspect there is bad soldering in the DAC board, cause i trace back and found the distortion came from the dac out put . (before 2 100uf coupling cap)
I was fustrated and gave up yesterday. Today morning, i opened the case and it played normally. Then i just closed the case and the distortion came back. (damn it)
i think the distortion is independent of the temperature. I think the vibration caused by sliding the top plate back will make the weak soldering point fall apart.
Anyway, i will get all the joint on dac board re-solder on this weekend. (and mod it as well : )
If i still cant get it fixed, can i take it to hifi fever to ask some experienced hifi-er to help me?