• The swap meet forum is for private non-commercial transactions. Only unmoderated members can post here.

    diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members. Use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

FS. 2sk82/2sj28 and 2sk63 NOS

Status
Not open for further replies.
Jump to Latest
J

joshvi

Member
Joined 2008
#1
Selling 2sk82/2sj28 pairs and 2sk63 . All are NOS


2sk82/2sj28 grade JE33 and KF33 85 USD/pair

2sk82/2sj28 both grade A55. Very very rare one.May be first batch and single die version. but not 100% sure about it. 110 USD/pair

small power 2sk63 Vfet 25 USD.

Shipping and paypal fees extra
 

Attachments

  • DSC01201.JPG
    DSC01201.JPG
    126.7 KB · Views: 644
  • DSC01202.JPG
    DSC01202.JPG
    118.5 KB · Views: 628
  • DSC01203.JPG
    DSC01203.JPG
    114.2 KB · Views: 639
  • DSC01204.JPG
    DSC01204.JPG
    115.6 KB · Views: 679
#3
A 55 is the first generation of 2sk82/2sj28 Vfets. Originally designed for analog application.Rank is 55. they are single die devices as per my knowledge. Later versions are optimized for switching amplifier application like Sony TA-N 88. Rank is 33 and are dual die version.

2sk63 don't have any complementary devices as per my knowledge. 2sk63 and 2sk79 are same product in different packages. one is in metal can and other one in plastic moulded.

Only few pairs for sale .How many you need? They are not matched but same grade devices. Matching requires only if, you connect them in parallel. If you are specific about matching I can do that but may take time.

Joshvi
 
#4
Hi Dear Joshvi, BTW, I want to get in reserve, two or four pairs...
The 63 is 220mw while the 79 is higher by two or three. I got from you two pairs of matched 79 some time ago.
About matching if the P is similar to the N, for use in complementary topology but not like follower.
Receive my best regards.
 
#8
No, K63 is 470mW while K79 is 750mW. Possibly due to difference in junction to ambient thermal resistance: 200 vs 126 C/W.

Check out their datasheets: AMPLIMOS one stage amplifiers amplificatori audio monostadio

Hi Joshvi, please also reserve 2 pairs of K82/J28 Rank33 for me with reasonable matching (VP not too different).

Thanks!
Edward Tam

dady said:
Hi Dear Joshvi, BTW, I want to get in reserve, two or four pairs...
The 63 is 220mw while the 79 is higher by two or three. I got from you two pairs of matched 79 some time ago.
About matching if the P is similar to the N, for use in complementary topology but not like follower.
Receive my best regards.
Click to expand...
 
#10
Thanks!

The K63 possibly only has the base side of the die contact the metal base. For the K79, the base of the die sit on the source pin (metal), and the top contact with the epoxy. So while the epoxy conduct heat less than efficient than metal, the K79 manages to outdone K63 in heat transfer efficiency despite less metal is used.


joshvi said:
Hi Edward Tam,

Power rating difference may be due to thermal resistance of different packing.

Two pairs reserved for you.

Best Regards
Joshvi
Click to expand...
 
Status
Not open for further replies.
Top Bottom