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Old 1st October 2009, 03:01 PM   #381
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Default Hi Masag1!

Quote:
Originally Posted by masag1 View Post
Hello,

here is the top an the bottom layer.

Regards

Sam
That what I talking about!

And where Schematic?

Regards zeoN_Rider

Last edited by zeonrider; 1st October 2009 at 03:02 PM. Reason: Mistake!
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Old 1st October 2009, 03:58 PM   #382
masag1 is offline masag1  Germany
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I know what you meant, zeoN_Rider

Schematics will follwow, cannot find in the moment.

Regards

Sam
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Old 1st October 2009, 05:15 PM   #383
AndrewT is offline AndrewT  Scotland
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Quote:
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can you measure the voltage without a load?
Then measure with a low current load, eg. bias set to 500mA and then voltage when bias set to 1000mA.
Quote:
Originally Posted by Glogov_Kolac View Post
I have been measured with no load, after rectifier bridge, when both (left and right) channels are disconnected.
what is the secondary Vac when the rectified & smoothed =18Vdc
You have smoothed the rectified AC? or not!!!
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regards Andrew T.
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Old 1st October 2009, 06:14 PM   #384
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After rectifier I measure 18VDC. With smooth circuit(capatitors) the measured value is the same!
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Old 1st October 2009, 11:50 PM   #385
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Hi Sajti,
Quote:
I would never use the KSC2690/KSA1220 as VAS
They do a better job in current stages.
Quote:
But this amplifier has different requirements, because that stage has to provide the base current of the output devices. The low Ic max types has significant beta drop with high Ic. The 2SC2911/2SA1209 B drops from 250 down to 100 at 100mA.
Very true. It`s kind of a problem. Such currents place them far outside their linear zone. In my view, the types with specified Icmax=50mA, should not be used at more than 10mA. As stated, video transistors are meant for high voltage-low current operation. Look, there´s much more to say about this issue.
Quote:
The speed is equal. Only the capacitances are higher (19pF vs 4pF). This is the only drawback
They have fundamentally different properties, maybe not apparent from data sheets. That`s what I`m desperately trying to point out.
Quote:
I don't know what do You mean with coarse types? The types I recommend is not for switching.
Western manufacturers have been developing semiconductors almost exclusively with switching performance in mind.
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Old 1st October 2009, 11:55 PM   #386
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Quote:
Originally Posted by masag1 View Post
I know what you meant, zeoN_Rider

Schematics will follwow, cannot find in the moment.

Regards

Sam
OK!

I'll still wait!

Regards zeoN_Rider
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Old 3rd October 2009, 10:14 AM   #387
masag1 is offline masag1  Germany
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Tutto completo

My friend sent me the schematics for DC protection
Regards

Sam
Attached Files
File Type: pdf DC Protect.pdf (23.3 KB, 277 views)
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Old 11th October 2009, 08:55 PM   #388
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I have purchased boards for what appears to be a Hiraga Le Monstre with 20-22 volt rails . I've poured through this thread and two others only to find wide ranging opinions regarding semiconductors. The parts list that is associated with the boards calls for 2n3055/mj2955 outputs ,2sd756/2sb716 drivers and 2sa872/2sc1775 cascode. The venerable j170/k74 jfets are at the input.


Two concerns; the 2n3055 combo which has been all but forgotten and the 2sb716 which is the only small piece I cant seem to buy.

The threads indicate other possibilities both for drivers and outputs.Would anyone care (I hope so) to offer alternatives based on actual experience.

I really have spent time looking through the threads and am not looking for an easy way out.

Thanks so much.
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Old 11th October 2009, 09:24 PM   #389
tinitus is offline tinitus  Europe
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I bought and built a Danish kit version many years ago
Very serious kit with absolute top of the top quality parts, unobtainaly to ordinary people, back then

I dont know if anything was changed from the original, but seems to me transistors are different
The outputs were with green housing, so I suppose they were all genuine Toshiba
I have specs on other used parts too, if needed

btw, it worked flawlessly, very good, still regret I sold it
Attached Images
File Type: jpg hiraga stor.JPG (16.8 KB, 567 views)
File Type: jpg hiraga transistorer.jpg (26.8 KB, 557 views)

Last edited by tinitus; 11th October 2009 at 09:34 PM.
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Old 11th October 2009, 10:29 PM   #390
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Quote:
Originally Posted by sandyhooker View Post
I have purchased boards for what appears to be a Hiraga Le Monstre with 20-22 volt rails . I've poured through this thread and two others only to find wide ranging opinions regarding semiconductors. The parts list that is associated with the boards calls for 2n3055/mj2955 outputs ,2sd756/2sb716 drivers and 2sa872/2sc1775 cascode. The venerable j170/k74 jfets are at the input.


Two concerns; the 2n3055 combo which has been all but forgotten and the 2sb716 which is the only small piece I cant seem to buy.

The threads indicate other possibilities both for drivers and outputs.Would anyone care (I hope so) to offer alternatives based on actual experience.

I really have spent time looking through the threads and am not looking for an easy way out.

Thanks so much.
Hi Sandy,

This is not a Le monstre it is the 20W class A... i think perhaps you will find much better results with different output transistors than 2N3055/2955

PS: I have some 2sd756/2sb716 left PM or email danw1million@hotmail.com so i dont annoy anyone on here.

-Dan
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