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.
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....
Marc
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
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:
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
What i have sold them for too other on the forum is:
The prices are like this.
1 - 24 pcs : 0.22€/pcs
25 - 99 pcs : 0.16€/pcs
100 - 249 pcs : 0.13€/pcs
250 - 500 pcs : 0.10€/pcs
The postage is 4,57€ for post up to 250gram in Europe.
You also have to add VAT of 25% unless you have a company.
But Maybe Jason Should open my section in the Manufactures section and we could continue from there??
There is a decent match between them.
The prices are like this.
1 - 24 pcs : 0.22€/pcs
25 - 99 pcs : 0.16€/pcs
100 - 249 pcs : 0.13€/pcs
250 - 500 pcs : 0.10€/pcs
The postage is 4,57€ for post up to 250gram in Europe.
You also have to add VAT of 25% unless you have a company.
But Maybe Jason Should open my section in the Manufactures section and we could continue from there??
There is a decent match between them.
No it is actually per type. We use a little time in repacking them and sending them.
It is meant as a service for DIY AUDIO fellows, and we (My wife and i) just want to get the time we use on packing them down and sending covered.
It is not much, more or less symbolic.
The rest up to the 4000 of each type is meant for my own production and service for at couple of years.
By the way. Renesas don't want to give a quote for new customers as 2SJ79 and 2SK216 is scheduled for EOL!!!
It is meant as a service for DIY AUDIO fellows, and we (My wife and i) just want to get the time we use on packing them down and sending covered.
It is not much, more or less symbolic.
The rest up to the 4000 of each type is meant for my own production and service for at couple of years.
By the way. Renesas don't want to give a quote for new customers as 2SJ79 and 2SK216 is scheduled for EOL!!!
There is a decent match between them.
Sonnya do you mean Npn to PNP too? Has i said you i will be ready for 50+50.
Marc
Yes i did mean npn to pnp.
Now i cannot remember it precisely but it is in figures 140 to 150 between npn and pnp.
That's a really good news, it's just a pity for the 100u i bought from mouser.....so TSSA BIGBT HP can continue to go foward...
Marc
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