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Old 19th August 2011, 04:05 PM   #2561
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Yes, with that trim you can null distortion. It also affects offset and when you have the right Fets you can null that with this trim too. It fluctuates a bit though because the Fets have a temp co. How does the Rabbit Hole sound and does it work properly ? I think it is a great circuit, a classic.
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Old 19th August 2011, 04:07 PM   #2562
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Yes, i know itīs the 10 Ohm in parallel. The 2 x 5 Ohm plus 50 Ohm just gives a bit less noise and more Gm but it is not very critical. In an open loop design much more then in the Rabbit Hole that works with strong feedback.
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Old 20th August 2011, 02:06 AM   #2563
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I found an interesting phono stage on the Tube Cad page. I post it hear just for completeness.
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Old 20th August 2011, 11:08 PM   #2564
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Some more stuffing has being doing on the Magnum Opus. I am nearly finished to fire it on for the first time.
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Old 23rd August 2011, 12:47 AM   #2565
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Joachim, what sort of price would the Magnum Opus be, theoretically speaking..
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Old 23rd August 2011, 03:13 AM   #2566
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You mean in the shop, in Japan for example, 30.000,-€. Itīs totally over the top. Making it is around 6500,.€. You can reduce cost a lot by using other resistors and caps and making a less elaborate PSU. The absolute minimum would be 2000,-€ material cost i assume without too many compromises.
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Old 27th August 2011, 05:22 PM   #2567
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Woooh...

That is expensive, I could manage the DIY priced option, 2000€ certainly isn't out of reach for a project that takes a few months. If you ever decide to make pcbs available, please let me know, even if I have sign a none disclosure agreement ;-)

Simon
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Old 27th August 2011, 05:46 PM   #2568
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Hi Simon !
A lot of the cost is in the pre-regulator i posted. If you use a more conventional supply and use normal metal film resistors plus less expensive caps ( no Black Gates, Silmik2, Mundorf Silver-Gold-Oil ) and no metal can LME49710, OPA627 you can cut the cost down to maybe 500,-€. Also for the PCBs i used Isola G200 that is also expensive. I am planning a run of 10 FR4 PCBs that also will cut the cost down. When i get this PCBs i will post it on this forum. I could then supply the PCbs plus circuit diagram and construction hints. The transistors have to be selected so just stuffing the board does not work. It creates a DC offset that sets up the second stage so it is not easy to build it without instructions.
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Old 27th August 2011, 05:55 PM   #2569
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Having built the HP5.1 phonostage without any instructions I know how painful that can be. I'll keep my eyes peeled for the PCBs.
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Old 27th August 2011, 06:02 PM   #2570
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OK, fine. I will help as good as i can.
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