BSS 129 (TO92 Low power mosfet) OK for pre-amps? - diyAudio
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Old 14th April 2002, 01:13 AM   #1
Lenin is offline Lenin  United Kingdom
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Default BSS 129 (TO92 Low power mosfet) OK for pre-amps?

I've spent the last couple of weeks listening to a friend's single-ended line stage, featuring the BSS 129 low power mosfet. To my ears, its a goody.

Does anyone have experience of this or any other low power mosfet for low level audio work?

Whata are the reasons why this device should (or shouldn't) work well?

Thanks in advance.
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Old 14th April 2002, 02:47 AM   #2
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Default TO92 Mosfets

Try the Zetex ZVN3110 and ZVP3310. They are fine for line level but too noisy for phono input. Make great followers biased at 10mA. Sound great. For some more information check out:

http://www.passdiy.com/pdf/diyopamp.pdf

H.H.
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Old 16th April 2002, 09:30 AM   #3
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MOSFET's are not suitable as an input transistor but they are swell in casodes and output stage. The only time they are very suitable are in inputstages in radios. MOSFET's (mostly dual gate) are very low noise at 100 MHz and above!

If you check my monster headphone amp QRV-01, you can see how I have done. The original design had MOSFET's in the high gain stage just before the output stage. I used Supertex Fets with Rdson 4 omhs and 3 A, 90 V, small metal can. Excellent results, see the techinical data!

Unfortuneatly Supertex don't make them anymore if you don't want >100 000 - 1000 000 pieces!
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Old 16th April 2002, 10:19 AM   #4
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Unhappy MOSFET's are not suitable as an input transistor

Uh Oh, Somebody had better break this news to Nelson Pass.....

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Old 16th April 2002, 02:22 PM   #5
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Default Low noise??

I must admit that I haven't tested various types av MOSFET's but CMOS-opamps noises a lot (except for chopper stablized, not suitable for audio though).

How low noise can you get from an normal MOSFET? Anyone who knows?
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