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Old 5th September 2005, 12:21 PM   #1
paladuv is offline paladuv  Norway
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Default 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
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Old 5th September 2005, 01:40 PM   #2
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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.
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Old 5th September 2005, 01:52 PM   #3
tlf9999 is offline tlf9999  United States
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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)?
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Old 5th September 2005, 05:03 PM   #4
edl is offline edl  Hungary
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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,
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Old 5th September 2005, 05:46 PM   #5
edl is offline edl  Hungary
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Sorry, a mistake:
instead of "VAS: 2sd667/2sb647" 2sd669/649
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Old 5th September 2005, 06:43 PM   #6
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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 "....
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Old 5th September 2005, 07:15 PM   #7
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How much do you weigh, Pavel ?
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2015 : World Cup Cat Hacky Sack
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Old 5th September 2005, 07:22 PM   #8
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Like snow bear, Jacco
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Old 5th September 2005, 07:47 PM   #9
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And I have probably the same IQ
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Old 5th September 2005, 08:59 PM   #10
paladuv is offline paladuv  Norway
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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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