E.C Audio Finestra Preamp - diyAudio
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Old 20th June 2011, 02:42 PM   #1
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Default E.C Audio Finestra Preamp

Hey peoples,

Anyone know much about this pre amp? I aquired it not long ago and cant find any info at all on the web about it.

Its a fantastic preamp mind, dont use the phono stage as i have a heavy modified CA 640p which i use instead (from details posted on here).

Tx muchly!
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Old 12th July 2011, 08:28 PM   #2
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No one?

Seems this 1986 preamp is abit of an enigma.
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Old 17th July 2011, 08:23 AM   #3
Itsmee is offline Itsmee  England
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Some background on the designer

6moons audio reviews: Tom*Evans Audio Design Linear A
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Old 17th July 2011, 08:35 PM   #4
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Yes, read that not long ago.. cant find much for this particular preamp though.

Im trying to work out what the circuit layout is and also what opamps are used, so i can do some upgrading to maybe discreate versions but cant find nothing!

All the opamps in the preamp seem to have heatsinks glued onto them, which is making it rather hard to see what they are. Also ive noticed every resistor in it is holco.
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Old 18th July 2011, 05:53 AM   #5
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Quote:
Originally Posted by mckaymckaymckay View Post
Yes, read that not long ago.. cant find much for this particular preamp though.

Im trying to work out what the circuit layout is and also what opamps are used, so i can do some upgrading to maybe discreate versions but cant find nothing!

All the opamps in the preamp seem to have heatsinks glued onto them, which is making it rather hard to see what they are. Also ive noticed every resistor in it is holco.
Have you considered contacting Tom Evans Audio Design directly and enquiring whether Tom would be interested in assisting you?

Many audio designers will answer an e-mail that they consider interesting.
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Old 18th July 2011, 10:08 AM   #6
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Yes, unfortunately before i posted here i sent him an e-mail asking about the preamp and whether he has any info on it, or remember what components he used.

Im still waiting for an e-mail back
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Old 18th July 2011, 10:10 AM   #7
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Ive found yesterday 2 JFET opamps which i think power the phono stage. Cant see any circuit layout at all on the board and maybe will need to resort to testing with a multimeter for continuity between components to work out a circuit.
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Old 18th July 2011, 10:26 AM   #8
Werner is offline Werner  Europe
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Here is a link to the patent filed in the EC days:

espacenet - Bibliographic data

The Finestra may, or may not, use this circuit.

In his later designs (Michell ISO, Argo, the TEAD stuff), Evans used
an opamp-wrapped-around-opamp trick that came from an application note: Analog Devices AN-107 (James Wong).
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Last edited by Werner; 18th July 2011 at 10:32 AM.
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Old 18th July 2011, 10:52 AM   #9
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It does look like it may apply, as the main layout is 2x 8pin opamp, followed by a 16pin chip (maybe quad opamp?, no writing on it) and then followed by another 2 opamps.
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Old 18th July 2011, 07:02 PM   #10
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Click the image to open in full size.

This is the basic layout from what i can see. I dont believe any components are under the board.
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