Sansui AU 717 power supply transistors

[jblmar]

Anyone know the best substitute transistors for the power supply in the AU 717? Niether Mouser or Digikey can supply the original parts. Niether offers a suitable replacement on their quotes.
They also don't list the diodes as available.
Thanks.

 

[jblmar]

This is for the power supply & protection board. The glue has contaminated quite a few connections and components as many of you know.

 

[jhoyt]

Which transistors and diodes? I rebuilt one somewhat recently, I can look and see what I used.

 

[scottrt]

The smaller ones can be subbed with KSA992 and KSC1845. Very inexpensive and work well.

 

[jblmar]

Yes, the transistor numbers would help.

2SD356 (D)
2SB526 (D,E)
2SC1708 (F,G)
2SA847 (F)


I don't have the zener diode number on hand. It's 13V, 1/2 watt DO35.
The other diode I can post later unless you have the number.

 

[Hyperion]

Yes, the transistor numbers would help.

2SD356 (D)
2SB526 (D,E)
2SC1708 (F,G)
2SA847 (F)


I don't have the zener diode number on hand. It's 13V, 1/2 watt DO35.
The other diode I can post later unless you have the number.

1N5243B = 13v, ½W zener

You should easily be able to find equivalents for the transistors, quoted many times in various threads here.

 

[jblmar]

Thanks. I tryed searching AK for the transistors. I must be typing in the wrong phrase.
Can you post a link?

 

[scottrt]

good info in this thread
http://audiokarma.org/forums/showthread.php?p=3922991#post3922991

 

[Hyperion]

And this one

http://www.audiokarma.org/forums/showthread.php?t=63258&highlight=2SD356

 

[jblmar]

Thanks!

 

[markthefixer]

Yes, the transistor numbers would help.

2SD356 (D) 90v 0.8a 1w 55-300hfe noFt
2SB526 (D,E) 90v 0.8a 1w 55-300hfe noFt

2SC1708 (F,G) 90v 0.05a 0.2w 250-1200hfe 150mhz
2SA847 (F) 90v 0.05a 0.2w 250-1200hfe 150mhz


I don't have the zener diode number on hand. It's 13V, 1/2 watt DO35.
The other diode I can post later unless you have the number.

hmmm

2SC1708 (F,G) 90v 0.05a 0.2w 250-1200hfe 150mhz
2SA847 (F) 90v 0.05a 0.2w 250-1200hfe 150mhz
I take it, these are feedback elements?

for gain:
512-KSA992FBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea
512-KSC1845EBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea

for current drive:
512-KSA1013YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17 (R=60-120, O=100/200, Y=160/320)
512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17


then, the power devices:
2SD356 (D) 90v 0.8a 1w 55-300hfe noFt
2SB526 (D,E) 90v 0.8a 1w 55-300hfe noFt

to-126 for space:
512-KSA1220AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.39 (R=60-120, O=100/200, Y=160/320)
512-KSC2690AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.40
(the 2690 right now at mouser is more available in short lead versions)

for overkill, if you have room for a to-220:
512-KSA940TU_Q pnp to-220 bce 150v 1.5a 25w 4mhz 40-140hfe $0.54
512-KSC2073TU npn to-220 bce 150v 1.5a 25w 4mhz 40-140hfe $0.54

and for HOT overkill:
863-MJE15033G pnp to-220 bce 250v 8a 50w 30mhz 70hfe $0.87
863-MJE15032G npn to-220 bce 250v 8a 50w 30mhz 70hfe $0.87

as for the zener:
512-1N5243B Fairchild 13 V, 0.5W Zener

 

[nosirrah]

hmmm

2SC1708 (F,G) 90v 0.05a 0.2w 250-1200hfe 150mhz
2SA847 (F) 90v 0.05a 0.2w 250-1200hfe 150mhz
I take it, these are feedback elements?

for gain:
512-KSA992FBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea
512-KSC1845EBU (ln)to-92 ecb 120v .05a .5w 100mhz 150-800hfe $0.05 ea

for current drive:
512-KSA1013YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17 (R=60-120, O=100/200, Y=160/320)
512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17


then, the power devices:
2SD356 (D) 90v 0.8a 1w 55-300hfe noFt
2SB526 (D,E) 90v 0.8a 1w 55-300hfe noFt

to-126 for space:
512-KSA1220AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.39 (R=60-120, O=100/200, Y=160/320)
512-KSC2690AYS to-126 ecb 120/a160 1.2a 20w 155mhz 35-320hfe $0.40
(the 2690 right now at mouser is more available in short lead versions)

for overkill, if you have room for a to-220:
512-KSA940TU_Q pnp to-220 bce 150v 1.5a 25w 4mhz 40-140hfe $0.54
512-KSC2073TU npn to-220 bce 150v 1.5a 25w 4mhz 40-140hfe $0.54

and for HOT overkill:
863-MJE15033G pnp to-220 bce 250v 8a 50w 30mhz 70hfe $0.87
863-MJE15032G npn to-220 bce 250v 8a 50w 30mhz 70hfe $0.87

as for the zener:
512-1N5243B Fairchild 13 V, 0.5W Zener

Whew, thanks Mark. You guys amaze me sometimes....:thmbsp:

 

[jblmar]

Thank's Mark.

 

[Pioneerjohn]

What should i use in the power supply, on au 717? 2sa847 and 1708

 

[Pioneerjohn]

Is the ksa 992 and ksc1845, good to use in the power supply?

 

[JoseHH]

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Yes you can use the ksa992F and ksc1845F for these two TO-92 parts in the power supply. They actually have a 100MHz transition frequency but it does not matter in this part of the circuit.