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Old 5th August 2002, 11:50 AM   #11
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Default try no 2SK369

Hi NickC,
I tried those first in my mc-stage. They work, but lack bass and tightness. That is the experience of hifidaddy as well.

I wouldn't use them. This phonoamp is supposed to be a quite good one, really high grade.
My current design does not sound bad, though it is not a killer by now.
There are suggestions to try 2SK240 double-fet instead.
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Old 6th August 2002, 06:41 AM   #12
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how would you connect the circuit then? new to fets world (bjt user). Also some tips on preventing esd would be good? thanks
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Old 6th August 2002, 10:44 AM   #13
Electrons are yellow and more is better!
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Originally posted by NickC
new to fets world (bjt user). Also some tips on preventing esd would be good? thanks
Every semiconductor are sensitive but some are more....

JFET's and BJT will normally not create much trouble but MOSFET's can be sensitive especially those with no gate protection what so ever. Small signal MOSFET's like BS170 are not protected. Also power fet's. Exception from that are Hitachis lateral types 2SJ50, 2SK135 and newer models. If you aren't sure, consult the datasheets.
/Per-Anders (my first name) or P-A as my friends call me
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Old 9th August 2002, 03:45 AM   #14
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anybody knows where to get the jfets 2sk170 GR model? and how to matched them.(circuit design would be great)
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Old 9th August 2002, 05:47 AM   #15
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Yes, but only if you want blues. 2SK147s, blue and probably violet.

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Old 9th August 2002, 08:42 AM   #16
dice45 is offline dice45  Germany
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Location: Munich, Bavaria

best hint for ceramic soldering strips i can give you: lay your hand on an old (non-functional) Tektronix oscilloscope and carefully dismantle, slaughter, butcher it. It is full of those strips.
Circuits: best avoid the side cutter at all and do it with your soldering iron.
Before i forget it: do it with respect and let the mastership of the Tek people how to do proper p2p wiring slowly soak in. Zen style

Use silver solder, it is needed for those Tek cermic soldering strips.
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Old 3rd September 2002, 04:27 AM   #17
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is it possible to use more jfets at the begining of the circuit. it reduces more noise than using one jfet rite. but with have to add resistance to the source for equally distribution of load rite?
what value should it be? and at the output stage should more jfets be used (increase gain) similar to pass pearl. what are the benefits of my suggestion and disadvantages too
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Old 1st October 2002, 09:19 PM   #18
Morello is offline Morello  Sweden
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I suggest that You implement a RF-filter at the input.
2k ohms in series and 100pF shunt to ground.

I have designed a RIAA-stage comprising one 2SK170 and one OPA2134 per channel. It works excellent with extremely low noisefloor.

Best regards\Morello
Audio design engineer. Commerical amplifiers: O&G Engineering RS2000 and Holographic Audio AMP-27 among others.
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Old 21st October 2002, 10:23 AM   #19
Werner is offline Werner  Europe
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Default 2sk240 datasheet

Does anyone have a 2sk240 datasheet? Seems to be a bit hard to find on the net.


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Old 21st October 2002, 11:21 AM   #20
jcarr is offline jcarr  United States
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Werner: I am pretty certain that the 2SK240 has been out of production for some years now, and this is likely why you cannot find a datasheet. From memory, this was a 40V medium-gm low-noise N device. The complementary was called the 2SJ75, I think.

Although I don't think I have a full data sheet, I probably have at least some basic numbers, so if you cannot find anything else, I'll go through my parts catalogs.

regards, jonathan carr
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