On Semi ThermalTrak - Page 64

Adrculda · 11th August 2010, 04:26 PM

Some success found HERE and my own build HERE

Will keep you guys updated on how the biasing goes on my build with the 8 pairs

Ricdelros · 13th March 2012, 06:47 AM

Is there anyone out there who knows which of these thermaltrak transistors used by McIntosh Mc2kW ?..or which these can be an equivalent Output..thanks

NJL0302DG 180W NPN
NJL0281DG 180w PNP

NJL3281D 200W PNP
NJL1302D 200W NPN

NJL4302DG 250W NPN
NJL4281DG 250W PNP

NJL21193DG 200W PNP
NJL21194DG 200W NPN

jacco vermeulen · 13th March 2012, 10:10 AM

NJL1302/NJL3281 (132300/132301)

Tony · 13th March 2012, 10:12 AM

Quote:

Originally Posted by Ricdelros

Is there anyone out there who knows which of these thermaltrak transistors used by McIntosh Mc2kW ?..or which these can be an equivalent Output..thanks

NJL0302DG 180W NPN
NJL0281DG 180w PNP

NJL3281D 200W PNP
NJL1302D 200W NPN

NJL4302DG 250W NPN
NJL4281DG 250W PNP

NJL21193DG 200W PNP
NJL21194DG 200W NPN

hi Ric, do you own one? you can reach me at 6282996.....we can chat....

Ricdelros · 13th March 2012, 02:14 PM

Thanks Jacco, this will be my stepping stone to build the Mc2kw..I'm in the process of making the PCB..Would you mind if ask where I can find the source of this latest catalog of McIntosh Semiconductor Data? It's a good thing to have this because its difficult to interpret McIntosh house ID..

Hi Tony..I'll be calling You.

Ricdelros · 17th March 2012, 01:54 AM

Hi Jacco, I'm back to you..Sorry, cant find either ECG or SK manual in hometown to search even equivalent numbers for Mc2KW transistors..I am still after for a few tr's for its preDriver stage. I have been struggling to start DIYing this amp and was nowhere to find its mcintosh house numbers. Other parts are no problem..can you provide once more?..if so, I'll post the numbers..
Thanks...

jacco vermeulen · 17th March 2012, 02:05 AM

The MC2KW is current McIntosh production, i respect that.
Would be a different story if the amp model was discontinued.

Ricdelros · 18th March 2012, 07:08 AM

Thanks Jacco.

hahfran · 18th March 2012, 06:27 PM

This minute I got 5 pairs ( matched so the vendor claims ??) NJL4281D / NJL4302D at internet auction nice price but not sure what to do with it. The ultimate thermal stability
of queiscent current is still achieved by the QUAD 303 triple cascade but this has dynamic constraints. I would use the trak diodes to control the bias of a standard Vbe multiplier which is not in thermal contact with heatsink.
Further at least subjectively but not measurable with software thd spectrum analyser it has turned out that to keep all of the BJTs of an amp predriver Vas drivers at a constant temperature as these are mounted on a common heatsink the temperature of which is controlled by a thermostat circuit.

13th March 2012, 10:10 AM	#633
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	NJL1302/NJL3281 (132300/132301) __________________ Looks like Sponge Bob has killed another thread.

17th March 2012, 02:05 AM	#637
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	The MC2KW is current McIntosh production, i respect that. Would be a different story if the amp model was discontinued. __________________ Looks like Sponge Bob has killed another thread.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
my project: class B with ThermalTrak	mafoe	Solid State	37	16th June 2009 04:30 PM
ThermalTrak transistor application.	Jeb-D.	Tubes / Valves	37	9th May 2009 02:17 AM
OnSemi ThermalTrak	Arius	Solid State	8	26th August 2005 04:09 PM
ThermalTrak circuit design	Mambo	Solid State	4	12th July 2005 11:03 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

11th August 2010, 04:26 PM	#631
Adrculda diyAudio Member Join Date: Jan 2009	Some success found HERE and my own build HERE Will keep you guys updated on how the biasing goes on my build with the 8 pairs

13th March 2012, 06:47 AM	#632
Ricdelros diyAudio Member Join Date: Apr 2004 Location: manila, philippines	Is there anyone out there who knows which of these thermaltrak transistors used by McIntosh Mc2kW ?..or which these can be an equivalent Output..thanks NJL0302DG 180W NPN NJL0281DG 180w PNP NJL3281D 200W PNP NJL1302D 200W NPN NJL4302DG 250W NPN NJL4281DG 250W PNP NJL21193DG 200W PNP NJL21194DG 200W NPN

13th March 2012, 02:14 PM	#635
Ricdelros diyAudio Member Join Date: Apr 2004 Location: manila, philippines	Thanks Jacco, this will be my stepping stone to build the Mc2kw..I'm in the process of making the PCB..Would you mind if ask where I can find the source of this latest catalog of McIntosh Semiconductor Data? It's a good thing to have this because its difficult to interpret McIntosh house ID.. Hi Tony..I'll be calling You.

17th March 2012, 01:54 AM	#636
Ricdelros diyAudio Member Join Date: Apr 2004 Location: manila, philippines	Hi Jacco, I'm back to you..Sorry, cant find either ECG or SK manual in hometown to search even equivalent numbers for Mc2KW transistors..I am still after for a few tr's for its preDriver stage. I have been struggling to start DIYing this amp and was nowhere to find its mcintosh house numbers. Other parts are no problem..can you provide once more?..if so, I'll post the numbers.. Thanks...

18th March 2012, 07:08 AM	#638
Ricdelros diyAudio Member Join Date: Apr 2004 Location: manila, philippines	Thanks Jacco.

18th March 2012, 06:27 PM	#639
hahfran diyAudio Member Join Date: Dec 2007	This minute I got 5 pairs ( matched so the vendor claims ??) NJL4281D / NJL4302D at internet auction nice price but not sure what to do with it. The ultimate thermal stability of queiscent current is still achieved by the QUAD 303 triple cascade but this has dynamic constraints. I would use the trak diodes to control the bias of a standard Vbe multiplier which is not in thermal contact with heatsink. Further at least subjectively but not measurable with software thd spectrum analyser it has turned out that to keep all of the BJTs of an amp predriver Vas drivers at a constant temperature as these are mounted on a common heatsink the temperature of which is controlled by a thermostat circuit.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)