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GB "long and skinny" FirstWatt J2 clone PCBs
GB "long and skinny" FirstWatt J2 clone PCBs
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Old 19th October 2019, 11:07 PM   #181
RustySanwa is offline RustySanwa
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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
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Gnub 2 sets
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RustySanwa 2 sets
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Old 20th October 2019, 01:38 AM   #182
gary s is offline gary s  Australia
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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?
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Old 20th October 2019, 01:03 PM   #183
JeffYoung is offline JeffYoung  Ireland
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GB "long and skinny" FirstWatt J2 clone PCBs
Hi Gary,

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

Cheers,
Jeff.
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Old 20th October 2019, 10:04 PM   #184
gary s is offline gary s  Australia
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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?
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Old 20th October 2019, 10:18 PM   #185
Rodeodave is offline Rodeodave  Austria
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Join Date: Dec 2004
Location: in the alps
GB "long and skinny" FirstWatt J2 clone PCBs
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
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Old 21st October 2019, 02:19 AM   #186
KevinHeem is offline KevinHeem  United States
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Join Date: Nov 2007
Location: Hudsonville, MI
GB "long and skinny" FirstWatt J2 clone PCBs
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
___________
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Old 21st October 2019, 07:40 AM   #187
vasillis is offline vasillis  Greece
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Join Date: Nov 2012
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2sj109bl.pdf


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

BR
Vasilis
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Old 22nd October 2019, 12:13 AM   #188
soundslave is offline soundslave  United States
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
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Old 22nd October 2019, 12:37 AM   #189
JeffYoung is offline JeffYoung  Ireland
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Location: Ireland
GB "long and skinny" FirstWatt J2 clone PCBs
Quote:
Originally Posted by vasillis View Post
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.
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Old 22nd October 2019, 12:39 AM   #190
JeffYoung is offline JeffYoung  Ireland
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GB "long and skinny" FirstWatt J2 clone PCBs
Did anyone buy 2SJ109s from tommygun_nz on eBay? How did they turn out?
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