HiFi transistors

paladuv · 5th September 2005, 12:21 PM

There have gone some time since I made my previous amp, and I have decided to start a new project.

My new project is going to use 70V power supply, but i have not yet decided on what transistors to use. The only transistor i have decided on is the current amp in the end, which is going to be made of several 2SC3281 and 2SA1302.

Do anyone have any recommendations for really good HIFI transistors that i can use?

Remi Holm

jackinnj · 5th September 2005, 01:40 PM

for the Slone amplifiers (as well as the Sumo Polaris in which we keep trying to get the schematic correct) the following transistors are used:

2n5401 + 2n5551
2n3906 + 2n3904

the voltage amplifier transistors could be 2sb649 and 2sd669 as in the Slone Amp, or 2sa1360, 2sc3423 in the Polaris.

others which I have seen used:
MPSA06 + MPSA56
MPS8099 + MPS8599 (Leach amplifiers)

Let me know if you have difficulty sourcing any of these.

tlf9999 · 5th September 2005, 01:52 PM

my favorite transistors are:

small signal: 5401/5551
driver: 21193/21194. Sometimes I will through a mosfet (irf510 or the likes).
output: fqa19n20 or 27n50 - cheap, indestructable.

A lot of others would have worked but since I have a boat load of them, why bother (for me)?

edl · 5th September 2005, 05:03 PM

For really high quality diy hi-fi amps I recommend these devices:

-LTP: 2n5401/2n5551
-VAS: 2sd667/2sb647
-DRIVERS: mje15030/mje15031
-OUTPUT: 2sc5200/2sa1943

These are fast and linear devices, excellent choices.

Best regards,

edl · 5th September 2005, 05:46 PM

Sorry, a mistake:
instead of "VAS: 2sd667/2sb647" 2sd669/649

Upupa Epops · 5th September 2005, 06:43 PM

Problem isn't so easy, gentlemen

. Quality of amp don't depend only at parametres of transistors

. Exist more " parametres ", which have much more " weight "....

jacco vermeulen · 5th September 2005, 07:15 PM

How much do you weigh, Pavel ?

Upupa Epops · 5th September 2005, 07:22 PM

Like snow bear, Jacco

Upupa Epops · 5th September 2005, 07:47 PM

And I have probably the same IQ

paladuv · 5th September 2005, 08:59 PM

Thanks!!

I will loock through your proposals!
Printing out a whole bunch of transistor data.

This is a good site I must say.

5th September 2005, 12:21 PM	#1
paladuv diyAudio Member Join Date: Sep 2005	HiFi transistors There have gone some time since I made my previous amp, and I have decided to start a new project. My new project is going to use 70V power supply, but i have not yet decided on what transistors to use. The only transistor i have decided on is the current amp in the end, which is going to be made of several 2SC3281 and 2SA1302. Do anyone have any recommendations for really good HIFI transistors that i can use? Remi Holm

5th September 2005, 07:15 PM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	How much do you weigh, Pavel ? __________________ Looks like Sponge Bob has killed another thread.

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5th September 2005, 01:40 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	for the Slone amplifiers (as well as the Sumo Polaris in which we keep trying to get the schematic correct) the following transistors are used: 2n5401 + 2n5551 2n3906 + 2n3904 the voltage amplifier transistors could be 2sb649 and 2sd669 as in the Slone Amp, or 2sa1360, 2sc3423 in the Polaris. others which I have seen used: MPSA06 + MPSA56 MPS8099 + MPS8599 (Leach amplifiers) Let me know if you have difficulty sourcing any of these.

5th September 2005, 01:52 PM	#3
tlf9999 Account Disabled Join Date: May 2005 Location: none	my favorite transistors are: small signal: 5401/5551 driver: 21193/21194. Sometimes I will through a mosfet (irf510 or the likes). output: fqa19n20 or 27n50 - cheap, indestructable. A lot of others would have worked but since I have a boat load of them, why bother (for me)?

5th September 2005, 05:03 PM	#4
edl diyAudio Member Join Date: Oct 2004	For really high quality diy hi-fi amps I recommend these devices: -LTP: 2n5401/2n5551 -VAS: 2sd667/2sb647 -DRIVERS: mje15030/mje15031 -OUTPUT: 2sc5200/2sa1943 These are fast and linear devices, excellent choices. Best regards,

5th September 2005, 05:46 PM	#5
edl diyAudio Member Join Date: Oct 2004	Sorry, a mistake: instead of "VAS: 2sd667/2sb647" 2sd669/649

5th September 2005, 06:43 PM	#6
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Problem isn't so easy, gentlemen . Quality of amp don't depend only at parametres of transistors . Exist more " parametres ", which have much more " weight "....

5th September 2005, 07:22 PM	#8
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Like snow bear, Jacco

5th September 2005, 07:47 PM	#9
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	And I have probably the same IQ

5th September 2005, 08:59 PM	#10
paladuv diyAudio Member Join Date: Sep 2005	Thanks!! I will loock through your proposals! Printing out a whole bunch of transistor data. This is a good site I must say.

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