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Old 7th June 2010, 07:56 AM   #21
juma is offline juma  Serbia
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Originally Posted by thanh1973 View Post
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...

Last edited by juma; 7th June 2010 at 08:05 AM.
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Old 7th June 2010, 08:22 AM   #22
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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
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Old 7th June 2010, 08:25 AM   #23
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Originally Posted by juma View Post
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 )
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Old 7th June 2010, 10:25 AM   #24
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would the 2SK2013/2SJ313 be a drop in replacement for an F4 Head phone amp?
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Old 7th June 2010, 10:36 AM   #25
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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.
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Old 7th June 2010, 10:47 AM   #26
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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?
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Old 7th June 2010, 11:16 AM   #27
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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 ...
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Old 7th June 2010, 12:31 PM   #28
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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.

Last edited by Melon Head; 7th June 2010 at 12:36 PM.
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Old 7th June 2010, 12:47 PM   #29
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Have you tried the exicon lateral mosfets?
If so how do they compare?
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Old 7th June 2010, 01:24 PM   #30
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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...
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