Is it possible to replace MPSW with MPSA?

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

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

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

Indeed or LSJ689/LSK489. 

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


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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, 20178 yr by Ariamella

Mmbt are surface mount so no

you have to check the pin outs for the rest

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, 20178 yr by Ariamella

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

Edited December 6, 20178 yr by justin

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...

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

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

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, 20178 yr by Ariamella

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.

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?

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


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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!

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

definitely not.

Thanks Dr. Gilmore !

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

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


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

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