F5 with 2SK2013/2SJ313 - Page 3

juma · 08:05 AM

Quote:

Originally Posted by thanh1973

Have you also tried IRF9610/610?....

Yes, long time ago - their inherent non-linearity makes them usable only as a CCS or as a voltage regulators, maybe cascoding devices.
IME, those are sub-optimal parts to use as amplifying devices in audio - maybe in guitar amps or in PA amps or in designs with a lot of NFB...

Zen Mod · 7th June 2010, 08:22 AM

Quote:

Originally Posted by thanh1973

Have you also tried IRF9610/610?
I actually had the same idea as yourself a while ago, but it is often hard to find the time, especially when you have too many ideas.
Great work, these sought of reports are a great contribution. It will definitely motivate me to try it out

tried tested abused

they're simply not up to task , comparing to these ones

Zen Mod · 7th June 2010, 08:25 AM

Quote:

Originally Posted by juma

Yes, long time ago - their inherent non-linearity makes them usable only as a CCS or as a voltage regulators, maybe cascoding devices.
IME, those are sub-optimal parts to use as amplifying devices in audio - maybe in guitar amps or in PA amps or in designs with a lot of NFB...

luckily , I'm not an emg .... ing... img.... wtf! not even good at math

(now - you'll say that toobz aren't good for audio

)

Luke · 7th June 2010, 10:25 AM

would the 2SK2013/2SJ313 be a drop in replacement for an F4 Head phone amp?

jacco vermeulen · 10:38 AM

Different bias voltage and you'd have to swap the 0.47 for 1 Ohm.

The F4 has less than unity gain, not very practicle for a headphone amp, imSo.

Luke · 7th June 2010, 10:47 AM

I thought low gain was preferable for HP amps, with a standard 2V in out its pretty loud. Besides I crank it up full all of the time so best to keep gain low

Would changeing the bias voltage be a simple adustment of the pot and maybe adjacent resitor that sets the Vref of the TL431?

juma · 7th June 2010, 11:16 AM

Quote:

Originally Posted by Luke

would the 2SK2013/2SJ313 be a drop in replacement for an F4 Head phone amp?

With some minor adjustments (as Jacco mentioned) it would be great. OTOH, when it comes to power-buffer for low Z headphones (but not lower than 25 Ohms) EUVL's DAO is my favourite ...

Melon Head · 12:36 PM

Quote:

Originally Posted by juma

Yes, long time ago - their inherent non-linearity makes them usable only as a CCS or as a voltage regulators, maybe cascoding devices.
IME, those are sub-optimal parts to use as amplifying devices in audio - maybe in guitar amps or in PA amps or in designs with a lot of NFB...

Well IRF9610 is used in the front end of Aleph 3/30 etc, so they can't be too bad.
But I take your point, the toshiba devices are much more linear according to the data sheets.
Maybe I should also try the toshibas in the front end of my Aleph 30.

I also like the look of 2sj407, not sure if there is a complementary N channel version though.

Melon Head · 7th June 2010, 12:47 PM

Have you tried the exicon lateral mosfets?
If so how do they compare?

juma · 7th June 2010, 01:24 PM

Quote:

Originally Posted by thanh1973

Have you tried the exicon lateral mosfets?
If so how do they compare?

I prefer laterals in common-drain topology, like here.

I tried F5 with old Hitachi laterals (k135/j50) and it didn't sound bad, it was different from original F5 but not better...

7th June 2010, 10:25 AM	#24
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	would the 2SK2013/2SJ313 be a drop in replacement for an F4 Head phone amp? __________________ If you give a man a fish he will eat for a day. But if you teach a man to fish he will buy an ugly hat. And if you talk about fish to a starving man then you are a consultant. Dilbert

7th June 2010, 10:36 AM	#25
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Different bias voltage and you'd have to swap the 0.47 for 1 Ohm. The F4 has less than unity gain, not very practicle for a headphone amp, imSo. __________________ Not so much,.......if it says "ZM" in the corner. Last edited by jacco vermeulen; 7th June 2010 at 10:38 AM.

7th June 2010, 10:47 AM	#26
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	I thought low gain was preferable for HP amps, with a standard 2V in out its pretty loud. Besides I crank it up full all of the time so best to keep gain low Would changeing the bias voltage be a simple adustment of the pot and maybe adjacent resitor that sets the Vref of the TL431? __________________ If you give a man a fish he will eat for a day. But if you teach a man to fish he will buy an ugly hat. And if you talk about fish to a starving man then you are a consultant. Dilbert

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7th June 2010, 12:47 PM	#29
Melon Head Banned Join Date: Nov 2006	Have you tried the exicon lateral mosfets? If so how do they compare?

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