The ultimate DIY? A Stax SRM-T2!

[micon21]

 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 13 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]

16 часов назад Крейг Сойерс сказал:

Ну, это действительно зависит от того, что именно вы тестируете. Я только что прогнал несколько своих C2240, и все они показали высокий уровень. Тот, который я только что поставил на Peak, — 453.

Разве я не удивлён 438? Ничуть, учитывая вышеприведённый C2240! 

let's compare our devices when measuring 3675. I assume you have it.

Edited 2 hours ago by micon21
надо

[Craig Sawyers]

That is about right for a C3675. You seem to be jumping around with what you measure. MPSA06, C2240, C3675. I've lost track of what points you are making.

[micon21]

5 hours ago, Craig Sawyers said:

That is about right for a C3675. You seem to be jumping around with what you measure. MPSA06, C2240, C3675. I've lost track of what points you are making.

 you asked how I check transistors. I showed a photo of the measurement 06.

I have no complaints about the 2240, with the datasheet declaring hFE 200, the ones I have show hFE 217

and showed what I see when I measure 3675, which you also have. I am sure the difference 
measuring the  of the 3675 transistor, hFE
for you   and me will not be big.

Edited 1 hour ago by micon21