Distortion from R-channel of Cosmic CO-60

[balu928]

Hi,

I am new to this forum. I have a cosmic CO-60 amplifier. Of late there is a slight distortion from the right channel. Does anyone here have the schematics for this amplifier? Could anyone here help me out as to why this is happening?

The output transistors are 4 in number, 2 for each channel. The number is visible on only one of them, which reads 2N305. Is this correct? Also, since this is a complementary-symmetry push pull design, the pair of transistors for each channel should be of different type. I don't think all the can be the same. Please correct me if I am wrong.

Thanks,

Regards,
Balu

 

[hemantwaghe]

india is big country ,can you pinpoint your location?
Mumbai cosmic is generally repaired ,IMHO amp is no great shake

 

[audiosystems]

Contact Ex cosmic service center on 022 26141212 at Vile parle east mumbai

 

[sarith]

The output transistors are 4 in number, 2 for each channel. The number is visible on only one of them, which reads 2N305. Is this correct? Also, since this is a complementary-symmetry push pull design, the pair of transistors for each channel should be of different type. I don't think all the can be the same. Please correct me if I am wrong.

Thanks,

Regards,
Balu

It could be 2N3055 which is NPN. MJ2955 is it's complementary PNP.

SGS Thomson Microelectronics - datasheet pdf

 

[Danieljohn]

Contact Ex cosmic service center on 022 26141212 at Vile parle east mumbai

Sir this number is showing "Wrong Number"
Kindly share your current number pls.

Thanks