The ultimate DIY? A Stax SRM-T2!

[micon21]

I am currently soldering a T2 board. Earlier I asked about the adequacy of Mouser. We discussed the STN9360. Today I took the MPSA06 out of the package. I measured the hFE and again was surprised by hfe= 438. According to the datasheet hfe= 100. I had three PZTA06's and they show hfe=207. I will have to use c2240, they show hfe=241. I am shocked at hfe=438.....

Edited 3 hours ago by micon21

[Craig Sawyers]

I have well over 100 MPSA06 (don't ask). I've just measured a random sample of a dozen or so. Many are loose, and many are on bandoliers. Measured on a Peak DCA75, all the ones I measured were in the range 135-180 at 5mA Ic.

438 seems high.

But Mouser is a five-star excellent supplier - I've used them for years. Although the hFE seems high, it might be an outlier. How did you test it?

[Craig Sawyers]

Well it really does depend on what you test. I've just run some of my stock of C2240's and they are all high. The one I've just put on the Peak is 453.

Sa am I surprised at 438? Well not in the least given the above C2240! 

[micon21]

53 minutes ago, Craig Sawyers said:

I have well over 100 MPSA06 (don't ask). I've just measured a random sample of a dozen or so. Many are loose, and many are on bandoliers. Measured on a Peak DCA75, all the ones I measured were in the range 135-180 at 5mA Ic.

438 seems high.

But Mouser is a five-star excellent supplier - I've used them for years. Although the hFE seems high, it might be an outlier. How did you test it?

 

[micon21]

50 minutes ago, Craig Sawyers said:

Well it really does depend on what you test. I've just run some of my stock of C2240's and they are all high. The one I've just put on the Peak is 453.

Sa am I surprised at 438? Well not in the least given the above C2240!