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Old 14th May 2012, 10:40 AM   #581
sonnya is offline sonnya  Denmark
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The optimum solution would be a chamber with constant temperature and then 1msec. pulses of Ib with Vce drop set to 1 and 5 Volt.

he he he - Next project.
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Old 14th May 2012, 02:33 PM   #582
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Quote:
Originally Posted by AndrewT View Post
The hFE function on most cheap and cheaper DMM is based on a constant Ib. This gives misleading results.
But worse, the Ib is set so low that, the hFE results are for an Ic that is off the left side of most manufacturers' plots of hFE vs Ie.

This combination of design faults makes the added on hFE function a virtual waste of effort and waste of resources.
hFE=Ic/Ib and I put series A-meter with collector and is always 1 mA so Ib is set and measured in a way that Ic=1 mA. I don't see any problem since hFE is symptomatic and consistant as I said recheck always showed the pairs stayed the same by measurement at Ic=100-500 mA.
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Old 14th May 2012, 05:17 PM   #583
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Hi LC i just test with DMM KSA/KSC=> sade news as grade are E for KSA and D for KSC, the DMM confirm the fact. I mesure just less 20U eche and the HFE settle between 158 and 165 for KSA and between 85 and 90 for KSC....Justnear double the Hfe from each an other.....

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Old 14th May 2012, 05:38 PM   #584
sonnya is offline sonnya  Denmark
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I Can supply you with Hfe E group of both types.
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Old 14th May 2012, 05:42 PM   #585
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Quote:
Originally Posted by sonnya View Post
I Can supply you with Hfe E group of both types.
It would be nice...just need E type from KSC3503 as i have 50x KSA1381 E type but 50x KSC3503 D type....

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Old 14th May 2012, 07:03 PM   #586
Jay is offline Jay  Indonesia
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Default Best Input Transistor

MPSA18 and its family has a maximum of around 1500 hfe (Philips has a maximum around 800). But I cannot even get 700 (with DMM) for my TSSA Still looking and measuring tho...

Accuphase uses discrete input darlington in similar situation. But it is not TSSA anymore...

ADD:
2SC1775A/A872A has hfe around 400-1200

Last edited by Jay; 14th May 2012 at 07:09 PM.
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Old 14th May 2012, 07:33 PM   #587
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LC do you have cross reference for 2SC3503/2SA1381 more easy to purchase? If some one wanted to build tssa HP, this part are and will be more harder to find in the futur...
Tomorrow i hope to acheave mesurement of 50x BC550 and 50x BC560
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Old 14th May 2012, 07:41 PM   #588
sonnya is offline sonnya  Denmark
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I have >5000 each and i would sell 1000 of Them each.

If it reduces your concern
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Old 15th May 2012, 05:51 AM   #589
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Quote:
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I have >5000 each and i would sell 1000 of Them each.

If it reduces your concern
Hi Sonnya

I would happily buy 100+100
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Old 15th May 2012, 08:02 AM   #590
mikelm is offline mikelm  England
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Please put me down for 50 + 50

thx
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