BC161 substitute?

[anderslober]

I searched the forum for a sub for the BC161. Nothing came up......can anyone recommend a sub?
It is for a Sansui au555a.
Thanks.

 

[skippy124]

I searched the forum for a sub for the BC161. Nothing came up......can anyone recommend a sub?
It is for a Sansui au555a.
Thanks.

Hi, Whereabouts in the AU-555a is the BC161 located, I don't think that it is a factory used component. I have an AU-555a on the bench at the moment, and I can't recall seeing BC161 in it?

Cheers

John

 

[anderslober]

In this unit...which has been worked on before....they are located at tr809/810.

 

[skippy124]

I assume that 2SC875E's are fitted to TR807/TR808 and not the "flying saucer" CDC8002A's. Early 555a's had the CDC8002a?CDC9002A's fitted, later models (mine included) had 2SC875E/2SA532A's fitted in place of the CDC's. In lower power amps I have used BC639/BC640's to replace the CDC's, and I think that they would be OK in the 555A. If you wanted to up the power rating, you could use TO126 packabe transistor - BD139/BD140, or MJ340/MJ350 (both pairs have been used to replace the CDC's in the AU999 with good results). The BC161 looks to be OK in that position. I would change out TR807/TR808 with the matching NPN complements to the sub for TR809/TR810.

Cheers

John

 

[anderslober]

I have a flying saucer in this unit...............

 

[skippy124]

OK,

The general opinion is that the CDC "flying saucers" should be replaced as they are known to fail

CDC8002 - NPN, TR803, TR804, TR807, TR808 - use either BC639, BD139 or MJ340

CDC9002 - PNP, TR809, TR810 - use either BC640, BD139 or MJ350

Keep the same series, don't mix BC with BD etc.

Cheers

John

 

[anderslober]

I have mj340/350's.........I'll use them.
On another note.....my buddy who brought it in wants lower-value resistors on the phone output. Stock value is 470 ohms.........he wants 200 ohm's in there....is that ok?

 

[skippy124]

I'm not sure re the headphone resistors. It won't harm the amp but I can't guarantee what it might do the the headphones or his ears!!

 

[anderslober]

I'll give him what he wants.........it's his ears!

 

[anderslober]

Ok.....I need a sub for 2sc627. I searched the forum....and I hit BF299....I do not have any of those......any ksc/ksa equivalents? Thanks.

I would also like to change the diodes d001/002..........in the SM they are listed as 10D-1 .............what subs can be used in there place? I have searched the forum...came up empty. Thanks.