2N5566 on CODA CLX preamplifier - diyAudio
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Old 19th December 2008, 07:53 AM   #1
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Thumbs up 2N5566 on CODA CLX preamplifier

Does single J-fet which I use instead of 2N5566/NPD5566 in CODA CLX preamplifier ?

On my hand are 2SK389, LS844 but I want to test at single J-fet which I can substitue after original was broken.

In my searching are 2SK170BL, 2SK370, PN4393, 2N4393, BF245B and 2N3819

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Anadigit
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Old 19th December 2008, 06:42 PM   #2
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The 2SK170 is a good example, and you can still get them, as well as the
LSK170

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Old 20th December 2008, 01:37 AM   #3
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Default Great !

Thanks Mr.Nelson

But when I look at data sheet of 2SK170 it not suitable for 2SK389/2

Why CODA Corp. use 2N5566 instead of 2SK389 ?

Thanks
Anadigit
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Old 20th December 2008, 03:45 AM   #4
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Anadigit,

2 matched 2sk170/LSK170's are the the equivalent of 2sk389. The Toshiba 2sk389 is two 2sk170's on a single die.

-David
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Old 20th December 2008, 05:59 AM   #5
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Smile Cool !

Does anyone have experience about 2N5566 in single die package, I just know 2SK170*2 = 2SK389

On my data sheet 2SK389 not suitable for 2N5566, Threshold, Krell, Coda used it in diff stage so long time ago and nowaday

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Anadigit
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Old 30th June 2009, 11:44 AM   #6
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This's my CODA PCB.
A few days it will be able to a DIY PROJECT ! (sorry for my bad grammar)

May be it's a B1's killer !





he he he
Anadigit
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Old 30th June 2009, 11:57 AM   #7
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Question Schematic comparable !

Top is CODA CLX bottom is B1.

But CODA CLX used PGA2310 to attenuated gain before pass through buffer stage (as my picture)

I try to use PEC POT instead of PGA2310, Now I loved B1 because of PEC POT made it musically !

http://listeninn.com/Website/Coda/Coda-CLX.htm
http://listeninn.com/Website/Coda/Coda-CLX-Detail.htm

PS. CODA CLX used +/- supply rails !

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Anadigit
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Old 30th June 2009, 12:04 PM   #8
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Default Missing model

Sorry for my incorrect information on the first posted.

http://www.diyaudio.com/forums/showt...18#post1689618

CODA CLX there's no NPD5566 on it but CODA used NPD5566 in the old model of their preamplifier and amplifier.

Thanks
Anadigit
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Old 30th June 2009, 01:40 PM   #9
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Smile Semi completed PCB

This's my CODA CLX PCB cloned.
There's no power supply, in my idea I have Threshold Fet 10/HE on hand and I decide to use its adjustable supply rails.

I don't like PGA2310 or CS3310 because of it made me not a purist high-end solid state !

Thanks
Anadigit
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Old 30th June 2009, 10:07 PM   #10
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Probably the boys at Coda use the 2N5566 because that's what we
used at Threshold when they worked there.

It's a perfectly fine part, but I doubt that it's very available. The
2SK389 would be preferred these days.

I do have a drawer with some 2N5566's and also some IT505's, which
are matched pairs with cascodes that we also used at Threshold.

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