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Old 1st June 2010, 10:58 PM   #1
tadiam1 is offline tadiam1  Argentina
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Default build this or not ??

SEE..How sound?
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Old 2nd June 2010, 08:32 AM   #2
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Where is this circuit from ??
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Old 2nd June 2010, 08:58 AM   #3
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obviously from some japanese amplifier usualy cricuits like that rock !!! very simple to make if done properly ( done properly means proper pcb proper filtering proper arangements and good quality parts )

please notice that comercial japanese amplifiers even though builted with none of the above units as amplifiers only performed very very nice.......
as a device though often suffered from a number of problems such is bad preamps ,bad crosstalk figures , bad cable routing , marginal power supply and transformer ....

let us not forget that this was comercial amps of the 1980... so using the old circuit and improove the above will make a very nice amp almost on the high end side

one draw back is the double diode of the VBE multiplier which i think will be impossible to find so either you have to create a string of diodes with a couple of 1N4148 or convert the schematic in order to use a transistor as a sensor

input fet might be tricky and be sure that the amplifier is based on the specific fets to work properly replacing those with something else and things are going to change ....for good for worst dont know .... but change ..

regards sakis
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Last edited by east electronics; 2nd June 2010 at 09:01 AM.
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Old 2nd June 2010, 10:42 AM   #4
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I think I would drop the front LTP, cascode the second to up transconductance and thats it, a two stage amp, that is if you see a folded cascode amp as a single stage. Ive actually got a amp which is exactly what I described, same than that schematic but for better mirror and without front ltp. Its super fast and the result is 20 khz distortion is virtually the same as that at 1 khz or 100hz, and is very low distortion , better than D self circuits.

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Old 2nd June 2010, 10:53 AM   #5
Mooly is offline Mooly  United Kingdom
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Reminds me of a Pioneer A80 i used to have,
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Old 2nd June 2010, 11:03 AM   #6
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Quote:
Originally Posted by Mooly View Post
Reminds me of a Pioneer A80 i used to have,
That pioneer has too many parts for my liking.
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Old 2nd June 2010, 11:15 AM   #7
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by homemodder View Post
That pioneer has too many parts for my liking.
And that's just the block diagram Ever seen the full circuit, full manual is on here,
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Bought it in the 80's on the basis of specs, and before I knew what really made a good amp sonically, and while it was for the day a top class performer it always sounded a little cold. You soon tired of listening to it somehow, despite it's technical excellence. A JLH 10 watter would see it off sonically without any trouble whatsoever.
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Old 2nd June 2010, 12:11 PM   #8
tadiam1 is offline tadiam1  Argentina
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Default re re

Maybe use equivalents parts...is easy to build.

from here is this amp

tramp_2
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Old 2nd June 2010, 02:20 PM   #9
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Originally Posted by tadiam1 View Post
Maybe use equivalents parts...is easy to build.

from here is this amp

tramp_2

Do you know what language all that is in ??? I would like to take a look at that site, some interesting stuff there.
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Old 2nd June 2010, 04:24 PM   #10
tadiam1 is offline tadiam1  Argentina
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Default and this

see this
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