Hi all,
Please view the photos and provide your input if your have same devices on hand.
2sa970, 2sc2240: 1) vendor claims to be Toshiba 2) the actual lettering 's color is the typical reddish gray not white like the photo suggests.
2sd1609d: 1) this is the only vendor carries suffix D (higher beta) version (fishy) 2) most Hitachi's to-126 has a Hitachi logo 2) Unless Renasas changed things, it's not genuine ?
Thanx.
Please view the photos and provide your input if your have same devices on hand.
2sa970, 2sc2240: 1) vendor claims to be Toshiba 2) the actual lettering 's color is the typical reddish gray not white like the photo suggests.
2sd1609d: 1) this is the only vendor carries suffix D (higher beta) version (fishy) 2) most Hitachi's to-126 has a Hitachi logo 2) Unless Renasas changed things, it's not genuine ?
Thanx.
All recent Toshiba jfets K170BL/V and J74BL/V are labeled with this redish grey colour lettering. If these are recent 2240/970 devices than I would assume that they are genuine if purchase from a reputable vender. Try BDent Enterprises . They sell genuine devices. Buy a few and compare.
Thank you for inputs so far.
Hey zeoN_Rider, I'm new here and dun-no whats between you and Tube_Dude, but u sur ant my father 😀
Please take a look at the new pictures. These I got from a Japanese vendor's site. So, I assume they are genuine, unless they invade over there too. They look like the ones I have. I think the reddish gray is low power laser marked.
Hey zeoN_Rider, I'm new here and dun-no whats between you and Tube_Dude, but u sur ant my father 😀
Please take a look at the new pictures. These I got from a Japanese vendor's site. So, I assume they are genuine, unless they invade over there too. They look like the ones I have. I think the reddish gray is low power laser marked.
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Sorry, I meant zeoN_Rider and Luke. 😉
zeoN_Rider, why are they fake then, can you educate us on your senses ?
zeoN_Rider, why are they fake then, can you educate us on your senses ?
They look exactly the same to the A970 and C2240 I got in Japan last year.
Did you test yours? (I haven't)
Did you test yours? (I haven't)
The bunch I got came in two different styles, and one of the styles tested low in beta. They check their stock and found the two styles after I called them, and they replaced my odd ones.
Again, thank you for all of the interests. (really we all should be, as this pair is good and many of us uses).
Please take a look at the 2 new photos I took from my ACTUAL ONES which the 2 on 1st post are from (amazing of their different appearances under different lightings. This is where pro. photographers make a living and I don't.)
FIY, all these tran. I purchased the same time (approx. 2 months ago). I've not been able to empirically tested them.
2SA970(GR): the 2 on right are real McCoys and left 2 are not, from what I see. Look at different font of "A970" and # "4". So sleek, they even copycat the batch#. LOL, we will end up with even more bad ones in the future after this post as I think they will go back to the drawing board and perfect the marking.
2SC2240(GR): I can not really detect any thing obvious compare the real McCoys. Any one has their tran.'s photos for comparison ?
As a side note, to my surprise, it seems none has ever used the 2SD1609 (siblings 2SD1610 2SB1109 2SB1110). Personally I think they are great for diff. inp. stage or even VAS for lower power amp for these reasons:
1) Even for slow 2SD series, they have a decent (well great) GBW of around 100 MHz
2) Beta (suffix D) is up to around 300
3) I challenge one to come up with a better device as for linearity, triodes included !
At this point, I plan to implement a simple preamp with it (2SD1609) and compare the 2SC2240 version, same topology. Nothing fancy, diff pair, CCS at -rail, 2 emit. Rs, and 2 col. Rs where AC coupled balanced output is taken. (As soon as I get the real McCoys
that is.)
Please take a look at the 2 new photos I took from my ACTUAL ONES which the 2 on 1st post are from (amazing of their different appearances under different lightings. This is where pro. photographers make a living and I don't.)
FIY, all these tran. I purchased the same time (approx. 2 months ago). I've not been able to empirically tested them.
2SA970(GR): the 2 on right are real McCoys and left 2 are not, from what I see. Look at different font of "A970" and # "4". So sleek, they even copycat the batch#. LOL, we will end up with even more bad ones in the future after this post as I think they will go back to the drawing board and perfect the marking.
2SC2240(GR): I can not really detect any thing obvious compare the real McCoys. Any one has their tran.'s photos for comparison ?
As a side note, to my surprise, it seems none has ever used the 2SD1609 (siblings 2SD1610 2SB1109 2SB1110). Personally I think they are great for diff. inp. stage or even VAS for lower power amp for these reasons:
1) Even for slow 2SD series, they have a decent (well great) GBW of around 100 MHz
2) Beta (suffix D) is up to around 300
3) I challenge one to come up with a better device as for linearity, triodes included !
At this point, I plan to implement a simple preamp with it (2SD1609) and compare the 2SC2240 version, same topology. Nothing fancy, diff pair, CCS at -rail, 2 emit. Rs, and 2 col. Rs where AC coupled balanced output is taken. (As soon as I get the real McCoys
that is.)
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