Cat + snowglob = dead sub

[Marsman]

I am trying to repair an Aiwa TSW-45 subwoofer after my cat knocked off and busted a snowglob on. I am trying to cross all of the semis. I have found replacements for all of the transistors but I am having trouble with the Mosfets because they have ben discontinued. Does anyone know of a current replacement for a 2SJ460 and a 2SK2158. I have tried looking thru the datasheets to try and cross them. I would be nice if they would all list the same specs. I got out of school before FETs were popular and therefor don't know which specs are the important ones.

[mariushm]

Re: Cat + snowglob = dead sub

Have you tried alibaba.com?
The people there usually have minimum orders of 5-10 pieces but you may get lucky requesting samples...

http://www.alibaba.com/trade/search?SearchText=2sk2158
http://www.alibaba.com/trade/search?SearchText=2SJ460

[Marsman]

Re: Cat + snowglob = dead sub

Has anyone done business with them? How does it work?

[kc8adu]

Re: Cat + snowglob = dead sub

have never trusted them enough to try.look up the specs of your parts and try to match on digikey.

[Marsman]

Re: Cat + snowglob = dead sub

That's been my problem. Since I am not familiar enough with FETs I don't know which specs are the important ones and that no two will list all of the same specs (even by the same manufaturer), I haven't felt comfortable about choosing one.

[hardwareguy]

Re: Cat + snowglob = dead sub

First and foremost...breakdown voltages and maximum drain current. Rds on is not that critical for amps, lower is better.

[Marsman]

Re: Cat + snowglob = dead sub

I am looking at the BSS138LT3G to replace the 2SK2158. Would this be an acceptible replacement? Would I have to change any bias resistors? These are used in the buffer amp and the auto power switching sections of the sub.

[Marsman]

Re: Cat + snowglob = dead sub

I am also looking at the ZVP4105A to replace the 2SJ460. I am concerned if these replacements are acceptible because the orginals have a Vgs of 7v and the replacements have a Vgs of 20v.

[Scenic]

Re: Cat + snowglob = dead sub

that site suggests the 2SK1590 / 2SK1591 as a replacement for the 2SK2158
http://english.electronica-pt.com/db...hp?ref=2SK2158

According to Renesas, the 2SJ461 is the official substitute for the 2SJ460
http://www2.renesas.com/maps_fronten...product=2SJ460

dunno how accurate this is or if the substitues are still available though.. :|

[Marsman]

Re: Cat + snowglob = dead sub

Those replacements aren't available either. But after looking at the specs for them, the ones I am looking at have similar Vgs and Rds values. So if the ones you listed are valid replacements the ones I listed will work.