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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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In Reply to: Re: Help for Levinson JC2 (John Curl design) preamp posted by john curl on May 19, 2001 at 13:14:07:
John,
Thanks for your kind answer.
I opened some modules with boiling ant-freeze; that is very hot. It eates the epoxy away a bit. (It were defective modules)
I found the input FET's to be 2N4392 and 2N5115. The output transistors were MPSU06 and MPSU56 (NOT FET's!) in line and phono modules. Maybe these are Tom Colangelo or Kevin Burke modifications. The general schematic appears to be the same. These modules had a silver shining plastic coated sticker on it, and no mentioning of power consumption or offset voltage. The old modules had a plain white paper sticker mentioning current and offset.
These input FET's will not improve the matching situation as you need a large pile of these.
I mailed to Positve Feedback for a copy of your improved circuit but got no answer (no feedback!) Do you have available a email copy or can you indicate the issue of the Positive Feedback Journal that mentions it?
Thank you for your courtesy,
ELSO
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Follow Ups
- Re: The Inwards of the Modules - Elso Kwak 05/22/0106:00:00 05/22/01 (3)
- Re: The Inwards of the Modules - john curl 14:16:10 05/22/01 (2)
- Re: The Inwards of the Modules - Elso Kwak 16:02:05 05/22/01 (1)
- Re: The Inwards of the Modules - john curl 21:52:46 05/22/01 (0)
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