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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Hi there,
Last night we tested a rather simple phono preamp circuitry with the following configuration:Cascoded MC input stage â€" passive riaa â€" output stage (OPA637)
The cascoded input stages comprised 2SK369 jFETs as lower transistors as well as upper transistors. The stages run at 5mA idle current with 2.5k drain resistors at +36V.
When we replaced the upper jFETs by a bipolar BC 547 transistor we were surprised by significant sonic improvement especially in definition and clarity in the bass.
Has anyone an explanation for this or is there any experience of other inmates ?
Thanks in advance
KlausB
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Topic - FET versus bipolar in MC input cascode - KlausB 02:46:10 01/09/02 (33)
- Re: FET versus bipolar in MC input cascode - jcox 10:38:10 01/14/02 (0)
- Re: FET versus bipolar in MC input cascode - Terry Demol 00:01:09 01/10/02 (3)
- Re: FET versus bipolar in MC input cascode - KlausB 09:55:34 01/10/02 (2)
- Re: FET versus bipolar in MC input cascode - Terry Demol 18:00:10 01/10/02 (1)
- MAT-transistors are MATched devices, right - groman 18:10:02 01/10/02 (0)
- Re: FET versus bipolar in MC input cascode - Thorsten 10:02:44 01/09/02 (5)
- Re: FET versus bipolar in MC input cascode - capslock 14:02:00 01/09/02 (4)
- Re: FET versus bipolar in MC input cascode - Thorsten 15:36:50 01/09/02 (0)
- cascode lin for dV over load, but makes slower circuit - groman 14:08:20 01/09/02 (2)
- I will stick around!, John Curl. I often know what I am talking about. - groman 15:46:38 01/13/02 (0)
- Re: cascode lin for dV over load, but makes slower circuit - john curl 18:10:15 01/11/02 (0)
- Idss - PhilH 05:50:04 01/09/02 (1)
- Re: Idss - KlausB 09:14:29 01/09/02 (0)
- I could explain. Schematic, thank you. - groman 05:27:15 01/09/02 (8)
- Re: I could explain. Schematic, thank you. - KlausB 09:16:03 01/09/02 (7)
- Very Great Site, I Enjoy it!!!!!! - groman 09:50:32 01/09/02 (5)
- Thanks a lot ! - KlausB 12:13:56 01/09/02 (4)
- I like to make somebody glad. Then my life is worth something. - groman 12:19:57 01/09/02 (3)
- Re: I like to make somebody glad. Then my life is worth something. - PhilH 19:30:51 01/09/02 (2)
- Re: loveletters are written in sand - groman 03:40:25 01/10/02 (0)
- talk to me with mIRC - groman 20:25:15 01/09/02 (0)
- many Thanks KlausB, will go there - groman 09:22:13 01/09/02 (0)
- Rule: BIPOLAR. Other options are inferior, as with todays semiconductors. - groman 05:15:30 01/09/02 (1)
- Was written only as answer to Headline. - groman 05:21:48 01/09/02 (0)
- Re: FET versus bipolar in MC input cascode - capslock 05:06:33 01/09/02 (6)
- Re: FET versus bipolar in MC input cascode - KlausB 09:19:44 01/09/02 (5)
- Re: FET versus bipolar in MC input cascode - capslock 13:51:58 01/09/02 (4)
- Re: FET versus bipolar in MC input cascode - KlausB 05:43:47 01/11/02 (3)
- small corrective voltage, you mean will dist? - groman 07:20:23 01/11/02 (2)
- Glad you did not leave the asylum ! - KlausB 15:07:54 01/11/02 (1)
- Re: Glad you did not leave the asylum ! - groman 15:07:53 01/12/02 (0)
- Re: FET versus bipolar in MC input cascode - Elso Kwak 03:05:56 01/09/02 (1)
- Re: FET versus bipolar in MC input cascode - KlausB 03:56:55 01/09/02 (0)
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