GB "long and skinny" FirstWatt J2 clone PCBs - Page 19

RustySanwa · 19th October 2019, 11:07 PM

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
pistollero - 2 set
nashbap 1set
mlwebb 1 set
Ibuell 1 set
Gnub 2 sets
Spades 1 set
RustySanwa 2 sets

gary s · 20th October 2019, 01:38 AM

Thanks or the reply Jeff, forgot no bias pots to tweak, so at a nominal +/- DC supply of 24V, that puts the power dissipation in each device at about 32 watts or so - comfortable.

Can I ask , what device have you currently got in the CSS position and also have you measured the heat sink/device temps for the chassis you are using?

JeffYoung · 20th October 2019, 01:03 PM

Hi Gary,

SJEP in the CCS. For temps, see here: Long skinny builders thread

Cheers,
Jeff.

gary s · 20th October 2019, 10:04 PM

Thanks Jeff, now I remember you posting that detail in the other thread.

Any changes to source resistor values, or any other tweaks from your original schematic?

Rodeodave · 20th October 2019, 10:18 PM

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
pistollero - 2 set
nashbap 1set
mlwebb 1 set
Ibuell 1 set
Gnub 2 sets
Spades 1 set
RustySanwa 2 sets
Rodeodave 1 set

KevinHeem · 21st October 2019, 02:19 AM

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
pistollero - 2 set
nashbap 1set
mlwebb 1 set
Ibuell 1 set
Gnub 2 sets
Spades 1 set
RustySanwa 2 sets
Rodeodave 1 set
kevinheem 1 set
___________

vasillis · 21st October 2019, 07:40 AM

2sj109bl.pdf

Hi folks. I wonder if them are genuine or not.

BR
Vasilis

soundslave · 22nd October 2019, 12:13 AM

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
pistollero - 2 set
nashbap 1set
mlwebb 1 set
Ibuell 1 set
Gnub 2 sets
Spades 1 set
RustySanwa 2 sets
Rodeodave 1 set
kevinheem 1 set
Soundslave 1set

JeffYoung · 22nd October 2019, 12:37 AM

Quote:

Originally Posted by vasillis

Attachment 789223

Hi folks. I wonder if them are genuine or not.

BR
Vasilis

Hi Vasilis,

The lettering doesn't look quite like mine (the letters have too much space between them). That doesn't mean Toshiba didn't change the lettering over time, but I'd be suspicious.

Do you have them in hand? Do they measure as JFETs? Most fakes I've heard about have been BJTs labelled as a 2SJ109, which should be easy enough to test. There's a bunch of info here: GB: for 2SK389 and 2SJ109.

Cheers,
Jeff.

JeffYoung · 22nd October 2019, 12:39 AM

Did anyone buy 2SJ109s from tommygun_nz on eBay? How did they turn out?

20th October 2019, 10:18 PM	#185
Rodeodave hates ground loops diyAudio Member Join Date: Dec 2004 Location: in the alps	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 pistollero - 2 set nashbap 1set mlwebb 1 set Ibuell 1 set Gnub 2 sets Spades 1 set RustySanwa 2 sets Rodeodave 1 set __________________ Gravity - Making the G since 13.7 billion B.C.

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19th October 2019, 11:07 PM	#181
RustySanwa diyAudio Member Join Date: Jul 2019	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 pistollero - 2 set nashbap 1set mlwebb 1 set Ibuell 1 set Gnub 2 sets Spades 1 set RustySanwa 2 sets

20th October 2019, 01:38 AM	#182
gary s diyAudio Member Join Date: Nov 2002 Location: Australia	Thanks or the reply Jeff, forgot no bias pots to tweak, so at a nominal +/- DC supply of 24V, that puts the power dissipation in each device at about 32 watts or so - comfortable. Can I ask , what device have you currently got in the CSS position and also have you measured the heat sink/device temps for the chassis you are using?

20th October 2019, 01:03 PM	#183
JeffYoung diyAudio Member Join Date: Jul 2017 Location: Ireland	Hi Gary, SJEP in the CCS. For temps, see here: Long skinny builders thread Cheers, Jeff.

20th October 2019, 10:04 PM	#184
gary s diyAudio Member Join Date: Nov 2002 Location: Australia	Thanks Jeff, now I remember you posting that detail in the other thread. Any changes to source resistor values, or any other tweaks from your original schematic?

21st October 2019, 02:19 AM	#186
KevinHeem diyAudio Member Join Date: Nov 2007 Location: Hudsonville, MI	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 pistollero - 2 set nashbap 1set mlwebb 1 set Ibuell 1 set Gnub 2 sets Spades 1 set RustySanwa 2 sets Rodeodave 1 set kevinheem 1 set ___________

21st October 2019, 07:40 AM	#187
vasillis diyAudio Member Join Date: Nov 2012 Location: athens	2sj109bl.pdf Hi folks. I wonder if them are genuine or not. BR Vasilis

22nd October 2019, 12:13 AM	#188
soundslave diyAudio Member Join Date: May 2010	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 pistollero - 2 set nashbap 1set mlwebb 1 set Ibuell 1 set Gnub 2 sets Spades 1 set RustySanwa 2 sets Rodeodave 1 set kevinheem 1 set Soundslave 1set

22nd October 2019, 12:39 AM	#190
JeffYoung diyAudio Member Join Date: Jul 2017 Location: Ireland	Did anyone buy 2SJ109s from tommygun_nz on eBay? How did they turn out?