2N5566 on CODA CLX preamplifier

[ANADIGIT]

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

Thanks
Anadigit

 

[Nelson Pass]

The 2SK170 is a good example, and you can still get them, as well as the
LSK170

 

[ANADIGIT]

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

 

[hifimaker]

Anadigit,

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

-David

 

[ANADIGIT]

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

Thanks
Anadigit

 

[ANADIGIT]

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

 

[ANADIGIT]

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 !

Thanks
Anadigit

 

[ANADIGIT]

Missing model

Sorry for my incorrect information on the first posted.

http://www.diyaudio.com/forums/showthread.php?postid=1689618#post1689618

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

Thanks
Anadigit

 

[ANADIGIT]

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

 

[Nelson Pass]

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.

 

[mbosko]

Questions for ANADIGIT

Coda_CL_Preamp

Following schematic what kind of transistors are

Q1 and Q2

Resistors R4 and R7 are 100k (1002) or 1M (1003)

Capacitor C2 (47uF) is Elko or bipolar (orientation)

Led3 (D2) is green ,red or...

Power supply voltage is +/- 15v or ...

can you measure voltage across R1 (150 Ohm)

some input and outputs are balanced , how they made it ?

Thank you very much

 

[ANADIGIT]

Hi,
Q1 is Zetex mosfet and Q2 is MPSW92
R4,R7 100K (I shown!)
C2 is Panasonic Nonpolar bicap with MITCAP
LED is white
+/-15V with easy regulation 7815/7915
Voltage across R1 is 1.5V
Balanced input and output are FAKE (shorted - to G, some told me balanced input so sweet )

 

[mbosko]

ANADIGIT

Can you tell me for Q1 what mosfet (Type ,mark)

Q2 is MPSW92(pnp or MPSW42 npn)

What it in the left side of preamp (picture left.jpg)

something like dual fet or...

Can you post a few more pictures of preamp - please clean the dust first


thanks a lot

 

[zaboks]

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.

Hi Mr Nelson,
I know it is a pretty old statement... but do you still have some of these 2N5566 ? I'm in France, so I need to fix one channel of my Coda 05r myself...
Hope you will answer, whatever your answer may be !
Thanks in advance
my email : nbocquet@hotmail.com

 

[Nelson Pass]

Yes I think I have some in storage. When I get back to Auburn I'll take a
look, but it might take some time before I do.

 

[zaboks]

waouh !
7 would be ideal, since I don't know how many of them are dead...
Thanks so much Mr Nelson for caring about the community like you do, and
take care of yourself too !

 

[Nelson Pass]

You should start finding out how many are dead, as I don't know I have or
can spare as many as 7.

 

[SY]

If you come up short, let me know, I have a few as well.

 

[zaboks]

Thanks SY,
How many do you have ? May be no need to bother M. Pass if you have enough ?

 

[zaboks]

Hi SY,
I'm eager to fix my Coda preamp... how many do you have and how much will you ask for ?
Thanks in advance