Yamaha YST-SW216 Problem

TLS Guy

TLS Guy

Audioholic Slumlord
Ratings
7,372 17 25
#41
I taken to lab but presently oscilloscope not available, so one of professor checked output to the speaker and found 1.34v so STK is damaged.
Presently in my place I checked all shops not available
Can u suggest me any other equivalent ic.
There is no equivalent. Nothing cross references. That is what I found out at the start of this. Mouser don't have it. It is listed on Digi-Key,t he world's largest supplier of electronic components as obsolete and no longer available. So they will never be available again.

This is the problem with ICs. There is usually only 1 production run and when they are done they are done.

Now you have made a good effort, and it seems you are in school.

So this is the end of the road for you unless you want to design a totally new IC power amp to run off that power supply as a class project. Now you are above my pay grade, but may be one of your professors can help. The difficult part will be duplicating the motional feedback part as we do not know its characteristics. So this is probably a next to impossible endeavor.

Its new sub time, I'm afraid.
 
P

PENG

Audioholic Overlord
Ratings
4,959 7 1
#42
There is no equivalent. Nothing cross references. That is what I found out at the start of this. Mouser don't have it. It is listed on Digi-Key,t he world's largest supplier of electronic components as obsolete and no longer available. So they will never be available again.

This is the problem with ICs. There is usually only 1 production run and when they are done they are done.

Now you have made a good effort, and it seems you are in school.

So this is the end of the road for you unless you want to design a totally new IC power amp to run off that power supply as a class project. Now you are above my pay grade, but may be one of your professors can help. The difficult part will be duplicating the motional feedback part as we do not know its characteristics. So this is probably a next to impossible endeavor.

Its new sub time, I'm afraid.
I missed many posts in a few days but it seemed like you have it narrow down to the IC amp. Is this the one he needs?
https://www.ebay.com.au/itm/STK404-...rated-Circuits-/121057024423?oid=362311002414

Otherwise he could buy the whole sub from ACFL
https://www.accessories4less.com/ma...16-10-100-watt-powered-subwoofer-black/1.html

No end of road yet, just money!!
 
TLS Guy

TLS Guy

Audioholic Slumlord
Ratings
7,372 17 25
#43
I missed many posts in a few days but it seemed like you have it narrow down to the IC amp. Is this the one he needs?
https://www.ebay.com.au/itm/STK404-...rated-Circuits-/121057024423?oid=362311002414

Otherwise he could buy the whole sub from ACFL
https://www.accessories4less.com/ma...16-10-100-watt-powered-subwoofer-black/1.html

No end of road yet, just money!!
Yes, that is the one he needs. He had better hurry, there are only 10 left out of the 33 that supplier in Florida had.
I would advise he buys 2 as insurance!

The Australian seller is already sold out.
 
TLS Guy

TLS Guy

Audioholic Slumlord
Ratings
7,372 17 25
#45
M Code

M Code

Audioholic General
Ratings
550 1
#46
IC product is obsolete but limited stock still available..
A China distributor we work with occasionally has 17 pcs in stock, they deal in overstock and discontinued silicon parts.. A few years ago, we bought 25K of a Sanyo video processor IC for a major USA AVR brand from this distributor so they could build AVRs for the 4th qtr. The ICs were not available due to an earthquake in Japan which had severely damaged the Sanyo IC factory. The replacement IC had same stock # but a different suffix, as it was for the OSD menu/fonts for another well-known brand. We got samples of the IC, rewrote the AVRs' firmware to handle the revised font library and went into production for the crucial 4 th qtr. In appreciation for saving the 4th qtr, the president for this well-known AVR brand gave me a sizable $ bonus for the find... :rolleyes:

Just my $0.02... ;)
 
lovinthehd

lovinthehd

Audioholic Overlord
Ratings
4,721 18 47
#47
IC product is obsolete but limited stock still available..
A China distributor we work with occasionally has 17 pcs in stock, they deal in overstock and discontinued silicon parts.. A few years ago, we bought 25K of a Sanyo video processor IC for a major USA AVR brand from this distributor so they could build AVRs for the 4th qtr. The ICs were not available due to an earthquake in Japan which had severely damaged the Sanyo IC factory. The replacement IC had same stock # but a different suffix, as it was for the OSD menu/fonts for another well-known brand. We got samples of the IC, rewrote the AVRs' firmware to handle the revised font library and went into production for the crucial 4 th qtr. In appreciation for saving the 4th qtr, the president for this well-known AVR brand gave me a sizable $ bonus for the find... :rolleyes:

Just my $0.02... ;)
So are you saying the IC available from Amazon will still work in this instance despite the different suffix?
 
M Code

M Code

Audioholic General
Ratings
550 1
#48
So are you saying the IC available from Amazon will still work in this instance despite the different suffix?
No...
The original part # STK404-070 is available..
The STK404 -140 part will not substitute, it has a different case & mounting centers...

Just my $0.02... ;)
 
21balu

21balu

Enthusiast
#49
I ordered STK 404-70 on 5days back today received and replaced with good soldering equipments,
Tried out found working satisfactory.
Good experience with STK.
Now planning to upgrade with little big size wooden box.
Thank you for your support.
 
M Code

M Code

Audioholic General
Ratings
550 1
#50
A couple of points...
1. Make sure the mounting screws for the 404-70 are torqued down snug, this crucial for proper thermal control
2. Be careful about overdriving the subwoofer, the 404-70 does not stand up well when driven into distortion

Just my $0.02... ;)
 

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