If you have counterfeit versions of a discontinued product that outperform the authentic part, I for one would be interested in trying them.
How would you know their performance?
Are you going to buy 1000 of them and test them for 10 years under various environmental conditions etc? What exactly would you be testing for and what is your tolerance for whatever dimension you were testing?
Sure, but your money is already gone 😉
Hi Nelson,
The parts I have on hand show an IDSS of around 20mA; I haven't found time to test for transconductance. Noise performance will stay unknown as I don't have the equipment.
I'm not aware of any p-channel jfet that comes reasonably close to the J74 in terms of transconductance (there are a few Sanyos and I think a NXP for the n-channel counterparts), so I would expect a lower performing part. However, it could easily be that you know more than me on alternatives.
Hannes
My Toshiba datasheets don't specify the package types nor the bulk supply method.
Does any one know if taped/reel and bent legs are a standard 2sk170 packaging type??
All my stock of jFETs, bf24x, 2n2xxx, Lsk, 2sk, 2sj are straight legged & loose.
Does any one know if taped/reel and bent legs are a standard 2sk170 packaging type??
All my stock of jFETs, bf24x, 2n2xxx, Lsk, 2sk, 2sj are straight legged & loose.
http://www.diyaudio.com/forums/swap-meet/159691-toshiba-2sk170-v-sales.html
that was easy
pretty impressive pictures
I dont know, but maybe both bulk or reel might have been available, on order
that was easy
pretty impressive pictures
I dont know, but maybe both bulk or reel might have been available, on order
The 2SK170 that you can get from Spencer or Zhou are both on tape (as in the picture) and not bulk.
Patrick
Patrick
or maybe not 😱
my own have straight legs
I got mine from Spencer, a long time ago
matched quads
idss clearly written on each
got hit by 'osmosis' 😀
Attachments
hey, please mark my words
I do not know
but what I see in your picture looks slightly cheap and 'dodgy'
or in other words
doesnt look carefully made like we see other Toshiba's
writiing looks a bit quer
Jfets arent sitting straight
legs arent paralel, or nicely seated in the tape
and tape looks, ehh, cheap
as said, I do not know
Attachments
Spencer's new stock are bulk, but tape is also genuine.
http://www.diyaudio.com/forums/vend...anted-but-hard-get-they-here.html#post2130034
So you cannot judge on the package alone. The only way to test is curve tracing.
Patrick
http://www.diyaudio.com/forums/vend...anted-but-hard-get-they-here.html#post2130034
So you cannot judge on the package alone. The only way to test is curve tracing.
Patrick
Hi everyone,
I received what I supposed to be the case I purchased. Unfortunaly, I a Hifi2000 3U 400mm whereas I ordered a 4U 300mm...
I don't know if I have to send it back or use it. Actually, the 4U 300mm thermal resistance of each sink is 0.31°/W which is what is required according to Nelson Pass' F5 use guide. Unfortunally, I can't find the thermal resistance for the 3U 400mm.
I can read this from Cviller a "few" posts ago ^^
If someone has more specifications to communicate about this case, feel free to post them please.
I received what I supposed to be the case I purchased. Unfortunaly, I a Hifi2000 3U 400mm whereas I ordered a 4U 300mm...
I don't know if I have to send it back or use it. Actually, the 4U 300mm thermal resistance of each sink is 0.31°/W which is what is required according to Nelson Pass' F5 use guide. Unfortunally, I can't find the thermal resistance for the 3U 400mm.
I can read this from Cviller a "few" posts ago ^^
If someone has more specifications to communicate about this case, feel free to post them please.
Can't believe I wrote 3u back then... but I am using 4u 400mm and I can keep my hands on them for as long as I live.
But you can calculate what you need using the specs of the heatsink. The channels are dissipating roughly 60W, so a 0.31 sink would see a temperature increase of 60*0.31=18.6 degrees. You add that to your living room temperature and try to stay below 55 deg C.
But you can calculate what you need using the specs of the heatsink. The channels are dissipating roughly 60W, so a 0.31 sink would see a temperature increase of 60*0.31=18.6 degrees. You add that to your living room temperature and try to stay below 55 deg C.
That makes more sense 🙂
Of course, the only problem is I can't find the thermal resistance for the 3U 400mm.
I think I'll ask the vendor for a trade.
Thank you very much for your answer.