Crescendo Millenium amplifier (ELEKTOR magazine ¹4 2001 p.36-45)? - Page 2 - diyAudio
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Old 11th February 2002, 12:59 PM   #11
Eccu is offline Eccu  Finland
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oops! weird smiley
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Old 11th February 2002, 05:47 PM   #12
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OP 77, OP177 and OP277 (and OP-97) are all upgrades of the standard OP-07, so they can all replace OP-07 in a DC-servo, basically any pin compatible modern op with low-offset , low bias can replace OP-07 in this circuit. (the higher number ,the better op)

OP-27 have much higher bandwidth and slew rate than the OP-07, but used in a DC-servo, this shouldnt matter since the servo loop is bandwidthlimited to about 1 Hertz or so. It could probably be used in a DC-servo circuit.

OP-37 is NOT unity gain stable (min gain 5 ) so I dont think it can be used in a DC-servo circuit.

/rickard
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Old 11th February 2002, 11:44 PM   #13
rickpt is offline rickpt  Portugal
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I also built an elektor amplifier that has a dc servo. I changed the original lf411 for an opa604 and it gave very good sonic results.

I hope this help’s

Regards

Ricardo
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Old 12th February 2002, 06:17 AM   #14
Eccu is offline Eccu  Finland
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thanks for everyone... I think that I try first OP07... because I´m stingy...
maybe I upgrade some day it to OP77EP or something, when my audition take some practice...



Happy listening for everyone
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Old 12th March 2002, 01:46 PM   #15
swede is offline swede  Switzerland
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So, where did you guys find the output transistors?

Here in Sweden, they are kind of hard to find. Any european supplier will do.

Regards,
//magnus
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Old 12th March 2002, 09:10 PM   #16
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the output transistors for the millenium cresendo are sold by ELFA:

check out page 796-797 in the new catalouge under "ersättningshalvledare" but they are quite expensive.

www.elfa.se

/rickard
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Old 13th March 2002, 07:54 AM   #17
Eccu is offline Eccu  Finland
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Quote:
Originally posted by swede
So, where did you guys find the output transistors?

Here in Sweden, they are kind of hard to find. Any european supplier will do.

Regards,
//magnus

In Finland / Oulu (Uleåborg)... there is an electronics shop named spelektroniikka (www.spelektroniikka.fi only in finnish)...

But I think that in Elfa has too these Fet´s.
2SJ201
2SK537 (equiv. 2SK2733)
2SK1530




I hope you understand my Enlgish
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Old 13th March 2002, 08:25 AM   #18
UrSv is offline UrSv  Sweden
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Swede,

I have 50 closely matched pairs of the 2SJ201/2SK1530 set. How many do you need?

/UrSv (Sweden)
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Old 13th March 2002, 09:34 AM   #19
Eccu is offline Eccu  Finland
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Quote:
Originally posted by UrSv
Swede,

I have 50 closely matched pairs of the 2SJ201/2SK1530 set. How many do you need?

/UrSv (Sweden)
Hey UrSv. How do you perform Fet matching?
Can you explain something or is there some www page?
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Old 13th March 2002, 09:37 AM   #20
Eccu is offline Eccu  Finland
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my amp. Rendered in Blender.
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