Toshiba 2SJ313/2SK2013 substitutes?

[rhythmsandy]

As these are obsolete are there any other better parts either from Toshiba or Fairchild devices to use as drivers in pass amps or preamps.

 

[qwertyl]

Fairchild FQP3N30 and FQP3P20

 

[xrk971]

I currently use these and they sound quite nice in an F5. I know - probably knock offs/fakes/etc but for $4.35 you have nothing to lose really. I am running them 4 pairs at 400mA bias current ea and the amp works well.

http://www.aliexpress.com/item/32678655869/32678655869.html
Free shipping K2013 J313 audio amplifier paired pipe 2SK2013 2SJ313 Original Product

 

[fab]

I have already opened a thread on this subject a few months ago.
Fairchild parts are not really substitutes but alternate solution.

Anyway, I have found genuine parts on this forum and it is matched as a bonus:
http://www.diyaudio.com/forums/vend...ery-rare-toshiba-transistors.html#post4717284

Fab

 

[NicMac]

I also still have a couple of sets of genuine matched devices up for sale (see link in my signature for updated information).
Cheers,
Nic

 

[pgrac]

Hi Nicmac do you stell sell 2sk2013 2sj 313 i need some.

 

[NicMac]

You could check out the link in my signature and then send me a PM if you are interested 😉

 

[Gyuri]

PM sent. 😉

 

[kamis]

Original pass transistors in my Borbely all fet regulators are J313/K2013. They are out of production, and someone suggested IRF510/9510 as substitute which I have been using for a long time. Would replacing them with Fairchild FQP 3N30 and 3P20 be improvement?

 

[Zen Mod]

in regulator - no

 

[kamis]

in regulator - no

Why? Farchild MOSfets have higher transconductance( 1.75 compared to IRF 510 1.1). I think that higher value gives regulator lower output impedance.

 

[Zen Mod]

will you hear it?

 

[kamis]

will you hear it?

I am not sure. But, there is a reason why Borbely used to use Toshiba rare and expensive Mosfets in his voltage regulators instead of IRF types.
I am not happy to desolder my IRF Mosfets and test regulators with FQP which are considered as a Toshiba substitute.

 

[2 picoDumbs]

They certainly weren't rare or expensive back when Erno was active.

 

[kamis]

They certainly weren't rare or expensive back when Erno was active.

Not rare as today, but more expensive and less available at major electronic parts distributors.

 

[Zen Mod]

even back then , it was pure Demonstration of Force , from Papa Borbely side

it's pure waste , even then , to use 2SK/2SJ in regulator , with plenty of easily available and dirt cheap alternatives

however , it certainly helped with customers believing in FiFi Voodoo ......

remember that E. Borbely , judging by his constructions , is and always was Engineer with big E , so real one ...... that's why I understand his regs as sort of tongue in cheek ......

btw. generally speaking - changing parts in active reg can be tricky business , depending of phase behavior of original circuit .

so , that's no Voodoo , just pure engineering ......