NTE50 replacement

Tombo

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Is there a modern day replacement for an NTE50? Mouser reads that it is obsolete and I need to find one locally. I am troubleshooting a 6100 and the FAQ suggests to replace the MPSA56 (Q101) with an NTE50.

Thanks!

-Tom
 
Is there a modern day replacement for an NTE50? Mouser reads that it is obsolete and I need to find one locally. I am troubleshooting a 6100 and the FAQ suggests to replace the MPSA56 (Q101) with an NTE50.

Thanks!

-Tom

NTE says you can replace MPSA56 with NTE159. Their cross reference engine is very nice.

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

Mouser has the NTE159 in stock.

http://www.mouser.com/Search/Refine.aspx?Keyword=NTE159

-VJ
 
NTE says you can replace MPSA56 with NTE159. Their cross reference engine is very nice.

http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

Mouser has the NTE159 in stock.

http://www.mouser.com/Search/Refine.aspx?Keyword=NTE159

-VJ

Yep, the 6100 FAQ mentions that is a direct replacement but recommends the NTE50.

I picked up a few A06's and a56's to have on hand. Turns out Q100 tested bad and it took out R100 as well. I replaced both and Tempest is alive again.

-Tom
 
A little late to help you, but maybe the next person to read this thread...

This link is to my standard rebuild parts kit...
http://www.biltronix.com/arcade_electcomp_01.html#wg6100_rebuild_parts

I have rebuilt several 6100's using these exact parts. I put a lot of effort into researching the 6100 in order to find the best parts available with focus on their specific values and other characteristics. I only choose parts that are at least equal to or much better than the original part spec.

In my opinion, the NTE50 or 159 parts are junk. The MSPA56 is a better performer and is more reliable. I may be biased. I tend to be repulsed by anything NTE. They used to be ECG, which through the 70's and 80's were nothing but remarked factory rejects and cheap knock-off parts from China and Taiwan and the Philipines. It was common for one NTE transistor to be crossed to more than 50 to 100 OEM parts with specs ranging more than 100% differences. Due to this, I used them only as a last resort. Besides that, the prices of NTE parts are usually insane compared to OEM parts.
 
In my opinion, the NTE50 or 159 parts are junk. The MSPA56 is a better performer and is more reliable. I may be biased. I tend to be repulsed by anything NTE. They used to be ECG, which through the 70's and 80's were nothing but remarked factory rejects and cheap knock-off parts from China and Taiwan and the Philipines.


I've always found it funny when I purchase an NTE part (for five times the price of an OEM)...only to open the packaging....and fine the NTE logo stamped over top....say a Texas Instruments logo.....With the Texas Instruments logo still clearly visible.

And yes, I'm an avid NTE hater.

Edward
 
From my notes (based on swimming through all the FAQ's, "expert" opinion, manuals, and talking to some trusted sources who have worked on these things for years):

Q101 MPSU57 (*Q1) Ordered from Bob Roberts

*Q1 Original PN is MPSA56. Upgrade to the TO-202 packaged transistor MPSU57 noting the orientation of the leads. Other parts suitable for this location are NDSU57 and NTE50.

So...I have used the MPSA56.
 
From my notes (based on swimming through all the FAQ's, "expert" opinion, manuals, and talking to some trusted sources who have worked on these things for years):
So...I have used the MPSA56.

That's from the regulator upgrade? MPSU57 over MPSA56 certainly helps, but I've still seen U57s blow... LV6100 is much easier :)

For the MPSA06 on the HV board, i've dropped in 2n3904 w/o issues...

Those are all just bias circuits, and don't see any high frequency stuff, so most of the normal transistor parameters (Hfe, BW, etc) don't really matter.
 
Bill, that is a GREAT page you have there! Thanks for putting all the work into documenting it. I have also had to do a bunch of research for weird parts on these monitors and others and it's really great to see all that information posted in such an ordered fashion! -Malcolm
 
That's from the regulator upgrade? MPSU57 over MPSA56 certainly helps, but I've still seen U57s blow... LV6100 is much easier :)

Yes it is for the LV regulator. And yeah, I'm sure a LV6100 would be a lot easier after mostly stripping and shotgunning a couple. I high watered all the parts just in case one failed 4th of July style. Its a bit more or a pain.
 
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