Maida Regulator Parts

Eli Duttman · 29th May 2007, 01:37 AM

Guys,

Maida Regulators are going to be needed here.

Would somebody please recommend a replacement for the discontinued NSD134 NPN transistor.

TIA.

Sheldon · 29th May 2007, 02:09 AM

TIP50

gingertube · 29th May 2007, 03:27 AM

TIP50 - good for 400V
For voltages above that you are getting into quite specialised and expensive stuff. Cheaper selections (if you can find them are below, note all these avail out of Farnell catalogue).

500V try BUL312FP
650V try BUL1403ED
700V try BU508D
800V try BUL216

Cheers,
Ian

Brian Beck · 29th May 2007, 03:53 AM

Or a high-voltage MOSFET...

Eli Duttman · 30th May 2007, 01:44 AM

Thanks guys. TIP50 it is. B+ in those old Fisher "boxes" is 110 V.

danFrank · 2nd June 2007, 03:51 AM

This may be a good place to use the TL783 3 pin regulator. It's a stand alone device good for up to 125v input-output differential. No pass transistor required.
Daniel

SY · 2nd June 2007, 12:56 PM

You don't need a pass transistor if and only if you can guarantee that the voltage differential will not exceed 125V at turn on or turn off. For a 150V supply, I'd be leery of that.

29th May 2007, 01:37 AM	#1
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Maida Regulator Parts Guys, Maida Regulators are going to be needed here. Would somebody please recommend a replacement for the discontinued NSD134 NPN transistor. TIA. __________________ Eli D.

29th May 2007, 03:53 AM	#4
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	Or a high-voltage MOSFET... __________________ Brian

30th May 2007, 01:44 AM	#5
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Thanks guys. TIP50 it is. B+ in those old Fisher "boxes" is 110 V. __________________ Eli D.

2nd June 2007, 12:56 PM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You don't need a pass transistor if and only if you can guarantee that the voltage differential will not exceed 125V at turn on or turn off. For a 150V supply, I'd be leery of that. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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29th May 2007, 02:09 AM	#2
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	TIP50

29th May 2007, 03:27 AM	#3
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	TIP50 - good for 400V For voltages above that you are getting into quite specialised and expensive stuff. Cheaper selections (if you can find them are below, note all these avail out of Farnell catalogue). 500V try BUL312FP 650V try BUL1403ED 700V try BU508D 800V try BUL216 Cheers, Ian

2nd June 2007, 03:51 AM	#6
danFrank diyAudio Member Join Date: May 2005 Location: California	This may be a good place to use the TL783 3 pin regulator. It's a stand alone device good for up to 125v input-output differential. No pass transistor required. Daniel

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