Is it an advantage to use this one instead of 2SC5200 or 2SA1943?

destroyer X · 12th February 2009, 10:06 AM

What do you think about those Fairchild units,this one for instance, is this one better or worse?

Why?

I have units enougth to produce a 6 Kilowatt amplifier.

regards,

Carlos

jacco vermeulen · 12th February 2009, 10:22 AM

Worse, if you look at the FJL4215 datasheet.
Better, if you already have so many.

For an equivalent extended beta and peak SOA, just put more in parallel.

sajti · 12th February 2009, 10:34 AM

This FJLs are quite good devices. I use many of them. What is the best, that they are available in selected B group.

Sajti

destroyer X · 12th February 2009, 12:09 PM

FJL is the prefix number to search the datasheet... i will take a look on that.

regards,

Carlos

sajti · 12th February 2009, 12:44 PM

I use 8 pairs of the FJL4215/4315 in bridged amplifier. It gives 250W/8ohms, and close to 900W in 2 ohms

Sajti

Bigun · 11th December 2009, 01:46 AM

Carlos, did you listen to these Fairchild devices ? - I have a few at my side and wondering whether to use any.

destroyer X · 03:29 AM

important differences between them, as i have both and use to assemble amplifier using both of them into the output.

I have a lot, all them gift from our forum friend Anonimous...now a days they are my main transistors because the number of units i have.... well, they are finishing because i have 6 amplifier assembled and some of them using many output pairs.... i think i may have 4 pairs of these Fairchild and about 5 pairs of 2SC5200/2SA1943

The advantage i had, is that mine units have the NPN and the PNP with almost the same gain, not 10 or 20 percent, but the absolutelly same gain... when the 2SC5200/1943 i have show 30 percent differences in gain, as usual, with bigger gain to PNP devices.

The fairchild 2SC5200 and 2SA1943 looks better in heat transference than the Toshiba ones.

This is the second time i can see that happening, first time was down the seventies when they used to sell some AD161/162 pairs matched inside a plastic bag and sometimes PVC case..but those Germanium were matched under 20 percent.

The upper case seems to be more hot than the 2SC5200, but transistor power, the transistor to case/heatsink heat transference looks to be the same.

For sure they may have small differences, but this represents something alike a big pot of soup and then you let three grains of sugar fell down into your salted food... no one can perceive sweet taste into such situation.

regards,

Carlos

Bigun · 11th December 2009, 04:46 PM

This is encouraging - it means I can use them. My 5200/1943 devices are TO-220 whereas the Fairchild devices are TO-3 and since I'm going to be biassing to Class A it seems that the bigger package will be a better choice.

destroyer X · 11th December 2009, 04:57 PM

The units are fine fellows, they work without complain and seems reliable and good under my eyes.

regards,

Carlos

12th February 2009, 10:22 AM	#2
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Worse, if you look at the FJL4215 datasheet. Better, if you already have so many. For an equivalent extended beta and peak SOA, just put more in parallel. __________________ Looks like Sponge Bob has killed another thread.

12th February 2009, 12:09 PM	#4
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Thank you guys. FJL is the prefix number to search the datasheet... i will take a look on that. regards, Carlos

11th December 2009, 01:46 AM	#6
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	Carlos, did you listen to these Fairchild devices ? - I have a few at my side and wondering whether to use any. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

11th December 2009, 03:20 AM	#7
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	Looks the same 2SC5200/2SA1943 transistors, i could not perceive important differences between them, as i have both and use to assemble amplifier using both of them into the output. I have a lot, all them gift from our forum friend Anonimous...now a days they are my main transistors because the number of units i have.... well, they are finishing because i have 6 amplifier assembled and some of them using many output pairs.... i think i may have 4 pairs of these Fairchild and about 5 pairs of 2SC5200/2SA1943 The advantage i had, is that mine units have the NPN and the PNP with almost the same gain, not 10 or 20 percent, but the absolutelly same gain... when the 2SC5200/1943 i have show 30 percent differences in gain, as usual, with bigger gain to PNP devices. The fairchild 2SC5200 and 2SA1943 looks better in heat transference than the Toshiba ones. This is the second time i can see that happening, first time was down the seventies when they used to sell some AD161/162 pairs matched inside a plastic bag and sometimes PVC case..but those Germanium were matched under 20 percent. The upper case seems to be more hot than the 2SC5200, but transistor power, the transistor to case/heatsink heat transference looks to be the same. For sure they may have small differences, but this represents something alike a big pot of soup and then you let three grains of sugar fell down into your salted food... no one can perceive sweet taste into such situation. regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline! Last edited by destroyer X; 11th December 2009 at 03:29 AM.

11th December 2009, 04:46 PM	#8
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	This is encouraging - it means I can use them. My 5200/1943 devices are TO-220 whereas the Fairchild devices are TO-3 and since I'm going to be biassing to Class A it seems that the bigger package will be a better choice. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.


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12th February 2009, 10:34 AM	#3
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	This FJLs are quite good devices. I use many of them. What is the best, that they are available in selected B group. Sajti

12th February 2009, 12:44 PM	#5
sajti diyAudio Member Join Date: Apr 2003 Location: Vác, Hungary	I use 8 pairs of the FJL4215/4315 in bridged amplifier. It gives 250W/8ohms, and close to 900W in 2 ohms Sajti

11th December 2009, 04:57 PM	#9
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	I have used them as drivers too, and the result (sonic) was fine! The units are fine fellows, they work without complain and seems reliable and good under my eyes. regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

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