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 July 21 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 July 22 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]

I warn you in advance. I am not happy with the purchase from Mouser. I bought several parts from 
digikey - 9360, 004, 06, 56. They will arrive around August 11. I am  very interested in what I will see on the 9350 case, and what the device will show - in hFE mode.

[JoaMat]

Please be careful with words. I do believe Mouser is a reliable company.

[Craig Sawyers]

Yup. Totally agree JoaMat. I've placed orders with Mouser for decades with zero problems.

If Mouser keep an eye on forums, or as a lurking member,  Micron21 could end up in hot water.

I used to be list admin for a Jaguar forum with 10,000 international members. And occasionally a list member would openly criticize a supplier. But all the major Jaguar parts and service outlets lurked as members on the list. So threats of legal action for defamation were regular, including to the list owner (me). I quit as admin because the stress of being potential sued was too much.

[micon21]

I showed you a photo of the transistors and the gain of the transistors that arrived. 
I am NOT happy with the big difference in measurements between the datasheet and what I see from the transistors from Mouser. I spent extra money for comparison. I made a test purchase from Digi. I will write the results.

Edited 1 hour ago by micon21

[micon21]

to achieve additional truth, I bought a device that was recommended to me on our forum - DUOYI DY294. I am waiting for the arrival of both DigiKey and Ali

[GeorgeP]