replacement mosfet recomendations??

[psychosteve]

i have 3 pair of mosfet amps with 2sk135 / 2sj50 output pairs.

i need to recase the amps all into one case, and was looking into replacing the mosfets with to218 or similar package units.

i was looking at 2sj200 / 2sk1529 at £3.50 / £4.00 each from cricklewood.

any other recomendations or suggestions?

cheers guys, steve.

 

[homemodder]

I wouldnt suggest 2sj200 and complement at all, those are vertical mosfets, well thats how they behave, they need thermal compensation that lateral mosfets dont, the 2sj50 and compl are lateral mosfets. Does you amps have a vbe multiplier???

Check out profusion plc in uk for suitable lateral replacements, also classd in uk have some lateral mosfets at more reasonable prices.

 

[psychosteve]

sorry should have posted schem.

 

[homemodder]

Theres no mosfets in that schematic.

 

[psychosteve]

another ps, please ignore all the transistor and mosfet part numbers, i only knocked this up in about 10 minutes and didnt realy pay attention.

q6 q7, input pair, 2sa872a

q3 q4, 2sd756

q5, 2sb716

q1 q2, 2sk135 2sj50

 

[homemodder]

Yep, no thermal compensation, have to use laterals, have a look at classd company in uk, they have some decent looking and cheap laterals, if you are not going to use those older hitachi mosfets sell them here on the forum, many looking for those.

 

[psychosteve]

ACD102PSD and ACD100NSD Lateral Mosfets from class d look ok and are slightly cheaper where these the ones you where thinking of?

http://www.classd.ltd.uk/product.php?productid=16174&cat=0&page=1

cricklewood have the 2sj50 and the 2sk135 t03, if any one needs them.

thanks for the help, steve.

 

[homemodder]

Yes, please note I dont have experience with those mosfets, but they are manufactured by a reputable company so cant be bad. For other choices look at profusion plc, but be prepared to pay double the price as laterals are not cheap.

Dont think anyone would be easily swayed to purchase those from cricklewood, they were discontinued ages ago and theres plenty of fakes around, cricklewood is known to pass one here and there.

 

[kevvywevvywoo]

I have a commercial power amp here using the 2sJ200 / 2sk1529 and the output pair on one side have gone s/c. Given that these originals are obsolete, what can you recommend as viable, reliable replacements that won't be likely fakes?

 

[homemodder]

Are they obsolete??? Im not sure that they are, they not easily available but Im pretty sure you can get some to fix your amp. There are many vertical mosfets around you could use ,theres plenty talk here of irfp240 and irfp9240 but Id go for originals. Try dalbani in Uk, should have them, but be prepared to pay a few pounds.

 

[megajocke]

2sk1530 and 2sj201 should be usable instead of 2sk1529 and 2sj200 but the package is a little bit bigger so if it's tight they might not fit.

 

[Samuel Jayaraj]

You could easily replace them with BUZ900 & 901, BUZ900CD and BUZ901CDP or even 2SK1058 and 2SJ162 (the last mentioned if the operating voltage is below 75v. You could also try the Exicon mosfets available from Profusion or the Class-D promoted by Anthony Holton.

 

[psychosteve]

the 2sj200 2sk1529 and the 2sj201 2sk1530 are avialable from cricklewood

http://www.cricklewoodelectronics.com/Cricklewood/product.php?productid=5569&cat=181&page=2

although as has been said else where, watch for the knock off's, ive never had a problem with them but some others have.

http://audiolabga.com/mal_cart/mal_cart.php?find=2SJ200

never tried these guys but they have stock and seem reasonable for cost.
hope that helps.

as for me, any other recomendations for replacement of 2sk135 / 2sj50 output pair??

cheers, steve.

 

[megajocke]

2sk135 / 2sj50:

There are the BUZ 9xx fets. both TO-3 and TO3-P
Exicon has fets called ECX-something, TO-3 and TO3-P

2sk1058/2sj162 is the current production model corresponding to 2sk135 / 2sj50 from the original manufacturer - these are in TO3-P package. There are lower voltage versions too: 2sk1057 and 2sk1056 (don't remember the p-channel equivalents)

There are some other types too but those will be even harder to get.

 

[psychosteve]

thanks but im looking to switch away from t03 package,
prefer t0264 or t0218 large-ish plastic package over 75watts.

cheers though, steve.

 

[psychosteve]

ps, im only using +/- 50v so lower voltage mosfets not a problem.

 

[megajocke]

TO3-P is almost the same as TO-218.

Both are plastic packages.

The plastic Exicons, Magnatecs and "Class-D" mosfets are in TO-247 (maybe TO-264 for the double-die variants).
The plastic Renesas are in TO3-P. (almost like TO-218)

 

[psychosteve]

sorry my bad, didnt see the "P" at the end. cheers, steve.

 

[Xoc1]

The circuit Diagram you posted looks like the old Maplin 150w mosfet module.
This is basically the same as the original Hitachi Application Notes for the lateral mosfets.
Do a search for 'GA28f' for more information.
Most Lateral mosfets are suitable.
These amplifiers are not really suitable for 4R loads but for a normal 8R load a pair of single die lateral mosfets is adequate.
If the original mosfets are still OK You would be better off looking at the various upgrades for the amplifier boards. The 2sk135
2sj50 are equal or better than any modern equivalent you can buy.
The Class D, Exicon, and Magnatec, Lateral mosfets are all made by Semelab in the UK.
The Class D mosfets are the cheapest and the Magnatec the most expensive They are all very similar.
Look at
http://www.semefab.com.cn/acd100nsd.pdf
http://www.semefab.com.cn/acd102psd.pdf
for decent spec sheets for the class D parts.
Hitachi Mosfets are Now Made by Renesas. 2sk1058 2sj162 are the modern T03p equivalents.

 

[psychosteve]

they are the old maplin amps, very good for spotting it.
they run fine into 6ohm (as all my speakers are) but im running 3 way active crossover, so have 6 units.

was looking to re case them into one box but the space i have i was going to cut off the t03 mount and us plastic case mosfets mounted on a central forced air sink i reclaimed from a cnc machine at work.

id rather spend £40 on mosfets than £200 on a 6 channel amp!

cheers for the help, steve.