GB "long and skinny" FirstWatt J2 clone PCBs

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED

Hanze Khronye 1 set
MEPER 1 set
Gyuri 1 set
mordikai 1 set (yes, 1 more)
——-
Olderthandirt 1 set
Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Quantensprung ???

 

[JeffYoung]

I recently bought 18 2SK170GRs to try and build up some matched pairs in the factory LTP current range (8mA - 12mA).

I ended up with:

2 pairs at 8.6mA (3.3+5.3 & 4.1+4.5)
2 pairs at 8.9mA (3.0+5.9 & 3.8+5.1)
2 pairs at 9.8mA (4.0+5.8 & 4.2+5.6)
2 pairs at 11.3mA (5.6+5.7 & 5.6+5.7)
1 at 4.5mA
1 at 5.8mA

I'm keeping the 8.6 and 8.9 twin pairs, but I'd be willing to sell the 9.8 and 11.3.

My sunk cost is €119, so it'd be €29.25 + shipping per twin pair.

 

[hifibluedevil]

I will take 2 pairs (whatever is left) as long as they are suitable for the j2 clone.
I have a quad of 2sj109s but not sure if they need matching (all BL).

 

[Eric]

... nice packing.

Very well packaged, indeed! My wife wanted to know why "some guy" in Ireland was mailing a ruler to me

 

[JeffYoung]

@hifibluedevil, the 11.3mA set is yours. €8.70 for registered delivery so €37.95 total.

(Your 2SJ109s don't need matching for a J2.)

Sorry folks, but that's it. They went really fast.

BTW: if anyone else wants to buy some and do some matching B&D Enterprises has them....

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED

Hanze Khronye 1 set
MEPER 1 set PAID
Gyuri 1 set
mordikai 1 set (yes, 1 more)
——-
Olderthandirt 1 set
Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Quantensprung ???

 

[hifibluedevil]

@hifibluedevil, the 11.3mA set is yours. €8.70 for registered delivery so €37.95 total.

(Your 2SJ109s don't need matching for a J2.)

Sorry folks, but that's it. They went really fast.

BTW: if anyone else wants to buy some and do some matching B&D Enterprises has them....

Payment sent, please confirm.
al

 

[JeffYoung]

Yep, got it.

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED

Hanze Khronye 1 set
MEPER 1 set PAID
Gyuri 1 set
mordikai 1 set (yes, 1 more) PAID
——-
Olderthandirt 1 set
Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Quantensprung ???

 

[JeffYoung]

Olderthandirt promoted from waiting list:

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED

MEPER 1 set PAID
Gyuri 1 set
mordikai 1 set (yes, 1 more) PAID
Olderthandirt 1 set
——-
Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Quantensprung ???

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED

hifibluedevil twin-pair 2SK170 PAID
Quantensprung 1 set PAID
MEPER 1 set PAID
Gyuri 1 set
mordikai 1 set + twin pair 2SK170 PAID
Olderthandirt 1 set
——-
Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED
hifibluedevil twin-pair 2SK170 SHIPPED
Quantensprung 1 set SHIPPED
MEPER 1 set SHIPPED
mordikai 1 set + twin pair 2SK170 SHIPPED

Gyuri 1 set
Olderthandirt 1 set

——-

Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???

 

[gary s]

Jeff, did you buy some of the 2SK170GR from B&D Ent - only problem is they want $60.00 USD for shipping for something that will weigh around an ounce!!

 

[Scott Stansbury]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED
hifibluedevil twin-pair 2SK170 SHIPPED
Quantensprung 1 set SHIPPED
MEPER 1 set SHIPPED
mordikai 1 set + twin pair 2SK170 SHIPPED

Gyuri 1 set
Olderthandirt 1 set

——-

Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Scott Stansbury - 1 set

 

[JeffYoung]

Jeff, did you buy some of the 2SK170GR from B&D Ent - only problem is they want $60.00 USD for shipping for something that will weigh around an ounce!!

Forgot about that part. (I used my mail-forwarding service in Florida.)

Anyone in the US want to do a Group Buy? They're dead-easy to match with something like an Atlas DCA75 Pro, but even without one a test-rig is easy enough to set up on a breadboard.

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED
hifibluedevil twin-pair 2SK170 SHIPPED
Quantensprung 1 set SHIPPED
MEPER 1 set SHIPPED
mordikai 1 set + twin pair 2SK170 SHIPPED

Gyuri 1 set PAID
Olderthandirt 1 set

——-

Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Scott Stansbury - 1 set

 

[JeffYoung]

JeffYoung 1 set RECEIVED
Reima 1 set RECEIVED
yoaudio 1 set RECEIVED
mordikai 1 set RECEIVED
blackdod 1 set RECEIVED
badrisuper 1 set RECEIVED
Skunark 2 sets RECEIVED
Dennis Hui 1 set RECEIVED
chromenuts 1 set RECEIVED
Eric 1 set RECEIVED
secanbj 1 set RECEIVED
hifibluedevil 1 set RECEIVED

Russelc 1 set SHIPPED
JimS 1 set SHIPPED
Vitalica 1 set SHIPPED
JoeyDD 1 set SHIPPED
gary s 1 set SHIPPED
astromo 1 set SHIPPED
bk856er 1 SHIPPED
vasilis 1 set SHIPPED
samoloko 1 set SHIPPED
baggerbole 1 set SHIPPED
Rolle 1 set SHIPPED
hifibluedevil twin-pair 2SK170 SHIPPED
Quantensprung 1 set SHIPPED
MEPER 1 set SHIPPED
mordikai 1 set + twin pair 2SK170 SHIPPED

Gyuri 1 set PAID
Olderthandirt 1 set PAID

——-

Malvin 1 set
pfisla 2 sets
Myint67 1set
twitchie 1 set
gig 1 set
flamethrower1 1 set
necplusultra 1 set
vvs07 2 sets
Dr.Strangelove3 1 set
WBS ???
malisz ???
dieter12 2 sets
Fabian85 ???
Scott Stansbury - 1 set

 

[Dennis Hui]

Please forgive my ignorance, but what are the advantages of using four GR parts
to create the current sources instead of using a pair of matched BL in
the correct Idss range?

Thanks,
Dennis

 

[JeffYoung]

Lower noise? Current is I1 + I2, but noise is RMS(N1) + RMS(N2)?

The above works in common source mode, but I'm not sure if it also works in diode-connected mode or not....

 

[gary s]

As posted by Jeff

"Anyone in the US want to do a Group Buy? They're dead-easy to match with something like an Atlas DCA75 Pro, but even without one a test-rig is easy enough to set up on a breadboard."

Good idea Jeff, B&D Ent show they have 192 of the Toshiba 2SK170 GR in stock at $4.33 each USD for over 25 pieces. Anyone in the US want to look at a GB on these as I think domestic postage in the US on this type of order value is free, then the organiser could send them out air mail in a small padded bag for around $10.00 international air mail depending on country destination. I would buy 20 off to get some nice matched pairs.

If not wanting to do a GB, any member in the US willing to buy them for me and then forwarding them on to me here in Oz, will pay all costs including devices, local US domestic postage, international air mail postage and Paypal fees, thanks. If so send me a PM.

Regards,

Gary..