CR-420 Transistor Replacemnts

[adolfo]

Hi this is a call for help for all good hearted geniuses out there. I got a non-working CR 420 a couple of years ago and I have got it to work a couple of times but for very short time. I decided to replace the transistors and it is being hell. I was wondering if anyone out there has a list of substitutions. After a lot of looking here’s what I have come up with:


2SC1571 - 2N4921
2SC1918 - KSD261
2SC458C - 2SD1835
2SA844 - KSP2907A
2SB5595 - KSB596
2SA659 - KSA1281Y
2SD525 - KSD526Y
2SA817 - BC640TA
2SC1627 - BC63916
2SC1175 - KSC815Y
2SD400 - KSC2328AYTA


Any suggestions?

 

[clinic-audio]

Hello Adolfo

welcome on AK

I don't understand why you want to change all these transistors if they are working ....

Here is the list of perfect sub for :

- 2SC1571 2SC1681(Toshiba) , 2SC1843(Nec), 2SC1775(Hitachi), 2SC2320L(Mitsubishi)
- 2SC1918 2SC1570(Sanyo) , 2SC2240(Toshiba) , 2SC1840(Nec) , 2SC1344(Hitachi)
- 2SC458C 2SC4641(Sanyo) , 2SC1815(Toshiba) , 2SC2320(Mitsubishi)
- 2SA844 2SA1783(Sanyo) , 2SA1015(Toshiba) , 2SA733(Nec) , 2SA999(Mitsubishi)
- 2SB5595 Do not exist in CR420
- 2SA659 2SA984(Sanyo) , 2SA1015(Toshiba) , 2SA953(Nec) , 2SA844(Hitachi)
- 2SD525 2SD1195(Sanyo) , 2SC2516A(Nec) , 2SD1134(Hitachi)
- 2SA817 2SA984(Sanyo) , 2SB647(Hitachi) , 2SA777(Matsushita)
- 2SC1627 2SC3708(Sanyo) , 2SD667(Hitachi) , 2SC1509(Matsushita)
- 2SC1175 2SC1815(Toshiba) , 2SC1213A(Hitachi) , 2SC3581(Mitsubishi)
- 2SD400 2SC2120(Toshiba) , 2SD471(Nec) , 2SD467(Hitachi)

Datas coming from Japan for Japanese transistors

Caraters in bolt is my choice

 

[adolfo]

Thank you so much. I am looking for them because they are missing. i have the circuit diagram and there is where i got the original numbers. the other thing is my typo where i wrote 2SB5595 should be 2SB595 ... ups.

Thank you again now i'm going shopping.

 

[jeromach]

@ clinic-audio; Nice replacements, but where would you be able to get them, apart from faky stuff offered on ebay?

 

[avionic]

@ clinic-audio; Nice replacements, but where would you be able to get them, apart from faky stuff offered on ebay?

Most likely has mass quantities " in stock new old stock" ......

 

[Mr. Yamaha]

Yep, always advertizing his parts and services...