231 hfe of MJ15004

Wagener · 21st May 2004, 10:35 PM

I have bought a few MJ15004's and MJ15003's. 6 of the 8 MJ15004's had a hfe of 240. other two had hfe of 2 and 118 respectively.

MJ15003's had hfes of 33, 38, 75, 25, 35, 36.

These were all measured with the same dmm.

The MJ15004 with 2 hfe I can send back right?

How about the high hfes?

I am going to use these as the driver stage in the leach amplifier.

Is it ok to use the complementary pair with different hfe's?

I don't think these are fake because I got them from a trusted source.

Damon Hill · 22nd May 2004, 02:58 AM

The hfe figures you quote for the MJ15004s all sound way too
high or too low. Measure them again, and use a different
meter if you get the same results.

I rebuilt my Leach amp using MJ21193/94s, which work just
fine.

Damon Hill · 22nd May 2004, 08:17 AM

Quote:

Originally posted by Wagener
I am going to use these as the driver stage in the leach amplifier.

Uhm, as drivers?

Could you elaborate on this? Doesn't exactly sound like
you're actually building a Leach amplifier, as the drivers
are normally specified as MJE15030/31s, I think.

Andypairo · 22nd May 2004, 10:43 AM

These are mine, which are surely genuine parts.
Will measure their Hfe and then compare it with yours.

Cheers

Andrea

Wagener · 22nd May 2004, 10:54 AM

Thanks Andrea. That will be greatly appreaciated

sss · 22nd May 2004, 11:34 AM

u cant measure the hfe of power transistors using your dmm!
i guess u got a dmm with a small socket to measure the hfe ,right?
well this socket is to measure hfe of only small signal transistors, u gotta use higher currents to measure the hfe of a power transistors.

ps those are power transistors not drivers

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22nd May 2004, 02:58 AM	#2
Damon Hill diyAudio Member Join Date: Mar 2001 Location: Auburn, WA (somewhere between Seattle and Tacoma) Blog Entries: 1	The hfe figures you quote for the MJ15004s all sound way too high or too low. Measure them again, and use a different meter if you get the same results. I rebuilt my Leach amp using MJ21193/94s, which work just fine.

22nd May 2004, 10:54 AM	#5
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	Thanks Andrea. That will be greatly appreaciated

22nd May 2004, 11:34 AM	#6
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	u cant measure the hfe of power transistors using your dmm! i guess u got a dmm with a small socket to measure the hfe ,right? well this socket is to measure hfe of only small signal transistors, u gotta use higher currents to measure the hfe of a power transistors. ps those are power transistors not drivers

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