Sub for NTE128P for ZTX450 Aleph 30

john65b · 11th December 2007, 04:09 AM

Quick question - would it be advisable to sub a NTE128P for a ZTX450? Looks like meets/exceeds ZTX450, but EBC instead of CBE...

Vcbo - 100v
Vceo 80V
Vebo 5V
Ic 1A
Pd 850mW
hfe 100 min
ft 50MHz Min

I have a few of the NTE128P left over, otherwise I would just buy the ZTX450...

Thanks

GRollins · 11th December 2007, 04:23 AM

Honestly, I don't trust NTE replacement parts. I've had some supposedly "same" parts that most definitely weren't. Worse yet, the NTE parts are frequently more expensive than better quality parts.

Grey

john65b · 11th December 2007, 01:27 PM

Yep. I noticed that. I will stick with the ZTX450 or MPSA18.

GRollins · 11th December 2007, 02:51 PM

One story of many:
Once upon a time there was a parts store here in town that I would stop by on the way into work. They were more expensive than Mouser or Digikey, but I could pick up parts and try them that night or the next day instead of having to wait a week for things to come in.
Back when I was building my main tube amps, I pulled together a high voltage regulator. Did the PCB artwork and did a run of six or eight boards so I could regulate the various things in the amp. The prototype worked well enough--with an NTE part I'd bought downtown as the pass device--so I decided to grab a few more and keep all the regulators the same.
I'll keep it short by omitting all the intermediate steps as I tracked down the problem, but the upshot was that roughly two-thirds of the "same" NTE parts oscillated--the remaining one-third sat there calmly doing their job. I had lucked upon one of the non-oscillating parts for the prototype, but duplicating those results was just about impossible.
I have very little good to say about NTE.

Grey

john65b · 11th December 2007, 06:55 PM

Very good.

BTW...The NTE was over 6x the cost of the ZTX450 from Digikey.

11th December 2007, 04:09 AM	#1
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Sub for NTE128P for ZTX450 Aleph 30 Quick question - would it be advisable to sub a NTE128P for a ZTX450? Looks like meets/exceeds ZTX450, but EBC instead of CBE... Vcbo - 100v Vceo 80V Vebo 5V Ic 1A Pd 850mW hfe 100 min ft 50MHz Min I have a few of the NTE128P left over, otherwise I would just buy the ZTX450... Thanks __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

11th December 2007, 01:27 PM	#3
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Yep. I noticed that. I will stick with the ZTX450 or MPSA18. __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

11th December 2007, 06:55 PM	#5
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Very good. BTW...The NTE was over 6x the cost of the ZTX450 from Digikey. __________________ "I speak Spanish to God, Italian to Women, French to Men, and German to my Horse" - Charles V

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11th December 2007, 04:23 AM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Honestly, I don't trust NTE replacement parts. I've had some supposedly "same" parts that most definitely weren't. Worse yet, the NTE parts are frequently more expensive than better quality parts. Grey

11th December 2007, 02:51 PM	#4
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	One story of many: Once upon a time there was a parts store here in town that I would stop by on the way into work. They were more expensive than Mouser or Digikey, but I could pick up parts and try them that night or the next day instead of having to wait a week for things to come in. Back when I was building my main tube amps, I pulled together a high voltage regulator. Did the PCB artwork and did a run of six or eight boards so I could regulate the various things in the amp. The prototype worked well enough--with an NTE part I'd bought downtown as the pass device--so I decided to grab a few more and keep all the regulators the same. I'll keep it short by omitting all the intermediate steps as I tracked down the problem, but the upshot was that roughly two-thirds of the "same" NTE parts oscillated--the remaining one-third sat there calmly doing their job. I had lucked upon one of the non-oscillating parts for the prototype, but duplicating those results was just about impossible. I have very little good to say about NTE. Grey

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