Which replacement transistor for Sanken C3856/A1492? - Page 6

chipper · 25th December 2010, 12:40 AM

Hi, I know bringing a thread from the dead

but I have a question? If I replace a higher rated output transistor inplace a of a lower power rated one? I put in C3856 and A1692 inplace of C4467 and A1694 because they were the only transistors I had. It plays good the receiver haven't had a problem so far. Any idea if it's good?

mt490 · 25th December 2010, 07:31 AM

Should be ok, depends on the circuit topology. The fT's and gains are within reason (well except the bigger transistor goes to a higher current as expected) and SOA is larger, so you shouldn't have too many issues if the output stage was an EF.

CFP on the other hand could cause issues with oscillation.

chipper · 25th December 2010, 07:49 PM

Quote:

Originally Posted by mt490

Should be ok, depends on the circuit topology. The fT's and gains are within reason (well except the bigger transistor goes to a higher current as expected) and SOA is larger, so you shouldn't have too many issues if the output stage was an EF.

CFP on the other hand could cause issues with oscillation.

Yeah im using them in a kenwood stereo receiver class ab design has pot for biasing. I haven't noticed anything funny ever since i put those in. The new devices i put are rated for 180v 15a and originals were 120v 8a i think? I thought that maybe by putting them in mite change something.

Oh yeah the model of my receiver is KR-A4040

tigrillo · 15th August 2011, 08:37 PM

Hello to all of the forum to replace these transistors it is D1047, B817 ok up to soon.....

25th December 2010, 12:40 AM	#51
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Hi, I know bringing a thread from the dead but I have a question? If I replace a higher rated output transistor inplace a of a lower power rated one? I put in C3856 and A1692 inplace of C4467 and A1694 because they were the only transistors I had. It plays good the receiver haven't had a problem so far. Any idea if it's good? __________________ Feel the PUNCH

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25th December 2010, 07:31 AM	#52
mt490 diyAudio Member Join Date: Jun 2010	Should be ok, depends on the circuit topology. The fT's and gains are within reason (well except the bigger transistor goes to a higher current as expected) and SOA is larger, so you shouldn't have too many issues if the output stage was an EF. CFP on the other hand could cause issues with oscillation.

15th August 2011, 08:37 PM	#54
tigrillo diyAudio Member Join Date: May 2010	Hello to all of the forum to replace these transistors it is D1047, B817 ok up to soon.....