Part Sourcing Assistance/Advice Thread

[penmarker]

Is it possible to replace MPSW with MPSA?

[Pars]

You need the MPSW for the outputs, which is 8 per board. The MPSA will work for the others. Do the SMD version.

[Pars]

JFETs... anyone look at ZVP3310 and ZVN3310 as possible J74/K170 replacements?

[Craig Sawyers]

They are MOSFET's, whereas J40/K170 are low noise JFET's. Why not just go for LSK74/LSJ170?

[spritzer]

Indeed or LSJ689/LSK489. 

[Pars]

I had just run across them on diyaudio and hadn’t looked at them closely.


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[Ariamella]

I was wondering about the transistors used on one of the older versions of the susy dynahi boards being obsolete, and after searching online I think I've found replacements for all of them that seem to be drop in. I'm just wondering if these are fine or if I need to find something else or try and source NOS or used parts.

• 2SA1358/2SC3421: KSA1220AYS/KSC2690AYS
• 2SA1145/2SC2705: MMBT5551/MMBT5401LT1G
• 2SA1349/2SC3381: matched pairs of KSA992/KSC1845
• Matched pairs of 2SJ74/2SK170: matched pairs of LSJ689/LSK489 or LSK74/LSJ170 (both seem to be rare/expensive!!)

Edited December 6, 2017 by Ariamella

[kevin gilmore]

Mmbt are surface mount so no

you have to check the pin outs for the rest

[Ariamella]

Do you have any other suggestions for 2SA1145/2SC2705 replacements?

EDIT: Just checked the pin outs for everything else and they're a match!

Edited December 5, 2017 by Ariamella

[justin]

2sa1201 / 2sc2881 is what i use..you could probably stand them up in TO-92 holes just watch the power

Edited December 6, 2017 by justin

[Ariamella]

5 hours ago, justin said:

2sa1201 / 2sc2881 is what i use..you could probably stand them up in TO-92 holes just watch the power

They appear to be discontinued, sadly enough.

Urg getting through-hole sand is incredibly difficult it seems...

[kevin gilmore]

even the ksa992/ksc1845, one of them is on backorder till February and i'm going to need them.

[PretentiousFood]

I think I have about 100 of each (ksa992/c1845) that I'll never use if anyone needs. Can check tonight. 

[Ariamella]

1 hour ago, PretentiousFood said:

I think I have about 100 of each (ksa992/c1845) that I'll never use if anyone needs. Can check tonight. 

What grade are they? I'd love some if you can spare them!

Edited December 6, 2017 by Ariamella

[PretentiousFood]

Mouser's finest!

I'm not sure about the hfe grade as I can't find the receipt. The package says FCE. FCE is not an hfe grade, but E is the highest and sounds like something I would buy.

Shoot me a PM if you'd like.

[Ariamella]

3 minutes ago, PretentiousFood said:

Mouser's finest!

I'm not sure about the hfe grade as I can't find the receipt. The package says FCE. FCE is not an hfe grade, but E is the highest and sounds like something I would buy.

Shoot me a PM if you'd like.

This is the hFE chart on the datasheet of the KSA992 (and should be identical to the grading system on the KSC1845).

@kevin gilmore, do the 2SA1145/2SC2705 on the ss dynahi boards I have need to be matched?

[Pars]

Matching never hurts... not sure that they need to be though.


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[Ariamella]

14 hours ago, Pars said:

Matching never hurts... not sure that they need to be though.


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I'm pretty certain they don't but I want to ask just in case!

[jose]

Can I replace the OPA134PA in the GRLV with a DVR134PA?

[kevin gilmore]

definitely not.

[jose]

Thanks Dr. Gilmore !

[ti5002000]

Guys for the 100uf Electrolytic in the ss dynalo what would be the best capacitor to use in that position?Both in technical and musical terms combined?or doesn´t that matter at all?

I saw some of us use nichicon ufg,ukz but i want to know if there are different opinions.

Thanks

[Pars]

I personally like Panasonic... FM or FR. If you want to go semi foo foo, use Elma Silmic II.


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[jose]

I like Nichi KW... but really, you can put anyone

[ti5002000]

28 minutes ago, Pars said:

I personally like Panasonic... FM or FR. If you want to go semi foo foo, use Elma Silmic II.


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What is semi foo foo in this case Pars? 

6 minutes ago, jose said:

I like Nichi KW... but really, you can put anyone

Yes i know i can use anyone but was just wondering what teh guys thought was best both in musical and technical terms. I was thinking in use nichi ukz.

Thanks Jose