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Old 17th August 2003, 07:28 AM   #1
bikejog is offline bikejog  United States
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Default Crescendo ME using 2sk135/2sj50

I got some pairs of those and I'm wondering if the Crescendo ME can be easily converted to those lateral? If not, how does the original Crescendo sound? What's the power rating of the Crescendo for either version? Do I need to make any changes to either circuit to use 2 pairs of output Mosfets instead of 1?

Andy
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Old 17th August 2003, 11:18 AM   #2
joensd is offline joensd  Germany
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Looking at the schematics of either theyīre actually not that different. The newer ME-version uses more powerful devices so you can get away with one pair.
Due to the temperature coefficient of the new devices, DC-offsets and overloads a bias regulation, DC-servo and overload protection is included (ME).
It gives 90W into 8Ohms and 135W into 4Ohms. Rails are +-(45-50)V.
The original delivered about 140W into 8Ohms and the mini crescendo about 70W if I remember correctly.

Cause you already have laterals Iīd go with one of older versions. You still can include DC- and overload-protection of course.

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Jens
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Old 17th August 2003, 09:53 PM   #3
bikejog is offline bikejog  United States
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I have only one schematic on the original Crescendo. How
can I tell whether it's the mini or the full-blown version? The
rail voltage was listed for 40-50V and one pair of Hitachi
was listed on my version. Is this the mini? Is so where can
I find the full version?

Also where can I still buy the semis? Can I substitute for more
modern ones? If so what should I use? Also do I need a
DC servo? If so, how can I add one to it?
Sorry for all the questions. I guess you can tell I'm no EE.


Thanks
Andy
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Old 18th August 2003, 05:26 AM   #4
joensd is offline joensd  Germany
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Hi Andy,
the ME versions is shown here.
If you donīt have that already you probably got the schematic of the mini version with 2SK135/2SJ50.
The latter doesnīt need the bias regulation.

Iīd go with the mini as you already have the semis.
There are more interesting amplifier with 2SK135/2SJ50,
I can look them up if you want.

If you still want the ME-version, I can send you some construction notes. The 2SK1530/2SJ201 are quite easy to get by the way.

Cheers
Jens
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Old 18th August 2003, 05:56 AM   #5
bikejog is offline bikejog  United States
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Hi Jens,
I already has the ME and the Mini schematics. I'm interested
in the big Crescendo (140w, which I don't have the schematic for).
If you can find more interesting amps using those semis, please
post them. I know there's a TA-3600 (or is it TA-4200? TA-4600?)
from Mark V on this website. I brought the Mark V kits
TA-477 and that's where all my semis are from, but I'm not
sure of the quality of the Mark V designs.

Thanks
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Old 18th August 2003, 06:21 PM   #6
joensd is offline joensd  Germany
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I think you can basically build an amp that uses 2SK1058/2SJ162 pair too as they are also laterals but Iīm not sure.

Iīve got another article from l`Audiophile magazine which is basically the same as the crescendo.
The schematics of the original crescendo you can download somewhere on the net (french article!).
If I donīt find the site I can email it to you.
Itīs about 3MB.

Cheers
Jens
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Old 18th August 2003, 06:26 PM   #7
joensd is offline joensd  Germany
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Should have looked before writing.
Here is the site you can download the schematics.
Itīs on the bottom one the page where it says "exemples de realisation".
The site is maybe intersting to you anyway cause there are a lot of amps using laterals. But mostly class A designs.

Jens
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Old 19th August 2003, 04:30 PM   #8
bikejog is offline bikejog  United States
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Thanks for the link. It was great..

Andy
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Old 22nd August 2003, 11:09 AM   #9
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Rather than the Crescendo big brother, consider building the Playmaster Amp. Someone here can provide the link. Randy Slone's OPTIMOS amp is another alternative.
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Sam
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Old 24th August 2003, 02:03 PM   #10
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Default Crescendo

Andy,

You can find the English version of the original "big brother" Crescendo article at :-

http://www.pacificdecal.com/solidstate.htm

I have built it with good parts and its still very much alive and kicking. Excellent for AV and quite good for Hifi.

my 2 cts

ckt


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