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Old 19th April 2013, 03:41 PM   #61
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Default Review Hi-Fi News & Record Review, Nov 1985

Here a nice review!

Unfortunately there are no measurements in this review...
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File Type: pdf cello-audio-palette-review-hifi-news-1985.pdf (735.9 KB, 116 views)
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Old 20th April 2013, 02:49 PM   #62
Nrik is offline Nrik  Denmark
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measurements on Palette Preamplifier - the opamp version.

The frequency manipulation is what I used for calculating the filters.
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Old 20th April 2013, 03:01 PM   #63
Nrik is offline Nrik  Denmark
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More reading. (991KB PDF download)
From page 8 and on some sound engineers express their joy with among other cello equipment also the Audio Palette.
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Old 18th May 2013, 05:44 PM   #64
Nrik is offline Nrik  Denmark
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Here is how it looks these days
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Old 19th May 2013, 12:23 PM   #65
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Wow, nice engravings!
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Old 19th May 2013, 04:23 PM   #66
Nrik is offline Nrik  Denmark
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The text is made with letraset transfers, not engraved.
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Old 19th May 2013, 05:43 PM   #67
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That's one of the reasons the original AP was so expensive. Levinson used real engravings and paid incredible attention to details...
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Old 21st November 2013, 03:44 AM   #68
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Nrik,

I tried using both Rod Elliott's MFB-filter program and the spreadsheet from Project 136 to calculate the filters. Both of these tools give negative resistor values for R2 when Q=.7 and the gains & center frequencies needed for the Palette controls are input. Did you end up using non-equal C MFB filters instead? There are solutions with non-equal C filters.

- Eric
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Old 22nd November 2013, 05:19 PM   #69
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Quote:
Originally Posted by Nrik View Post
Here is how it looks these days
Beautifully made, Nrik !!
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Old 3rd January 2014, 07:57 PM   #70
Nrik is offline Nrik  Denmark
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...hey guys, sorry for not replying in my own thread for 1˝ month.

Thankyou Ticktock

Eric Weitzman: You should read Rod Elliots Expandable Graphic Equaliser instead.

I will check up what values I used exactly at some point, but what you also should know, is that I put the gain in some separate opamps, and let the filters be filters.
Thinking back I even think I calculated each filter to be -6dB down and added that to the gain, because the filters had both high-pass and low-pass attacking the same frequency ( -3 +-3dB = -6dB)
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