Aleph J Schematic - Page 138

Zen Mod · 5th December 2012, 05:26 PM

pics

kroyin · 5th December 2012, 06:00 PM

Since there is nothing to debug :-) pic of the crows nest.don't flame me for the long input output wires, I driiled the holes wrong (short circuit in between two God given headphones :-) )

kroyin · 5th December 2012, 06:06 PM

& the outside,even better :-)

albertNL · 1st January 2013, 09:28 PM

I hope someone can explain some things for me.

I have been looking at the manuals (user and service) of the A3, A30 and AJ and have made some notes of the differences. I then tried to relate the differences by comparing the amps schematics, but there are too many variables for a newcomer like me to explain the specifications. I hope you guys can give me a hand.

Rails are about the same:
A3 and A30: 25V
AJ 24V

Gain:
A3 20dB
A30 20dB (balanced) 26dB (single ended; manual explains that A30 has 6dB greater dynamic range than A3)
AJ 19.6dB (does not specify a difference between balanced and single ended)

I understand the higher gain of the A30 is due to the input stage. Is this correct?

Power used:
A3 and A30: Each channel draws about 100W
but:
A3 250W consumption
A30 and AJ 200W consumption

Question:
If A3 and A30 both have each channel drawing 100W, should total consumption not be similar?

Active output stage biased by current source at
A3 slightly greater than 2 amps
A30 slightly less than 2 amps
AJ not given

Max. output:
A3 30W/8R, 60W/4R, 60W/2R
A30 30W/8R, 40W/4R
AJ 25W/8R, 13W/4R (Firstwatt product table)

Question:
What causes the difference between 4 Ohm output of A3 and A30? I assume it is the "slightly greater" and "slightly less" than 2A bias that is the cause. Is this assumption correct?

Question:
How come the AJ has so much lower power into 4 Ohm? I assumed that, since total power consumption is similar, bias must be similar.

Max output
A3 23V 8A
A30 25V 5A
AJ 21V 2.5A

Questions:
What causes the relative large difference between A3 and A30?
Are the numbers for the AJ correct? If so, why so different from A3 and A30?

Thanks,

Albert

Zen Mod · 1st January 2013, 09:45 PM

whoa !

will write reply ......... in few days , not after NY eve

'ts time for sandwiches and moves , these days

albertNL · 1st January 2013, 09:46 PM

Quote:

Originally Posted by Zen Mod

whoa !

will write reply ......... in few days , not after NY eve

'ts time for sandwiches and moves , these days

Thanks! Hope your head does not hurt too much.

Zen Mod · 1st January 2013, 09:48 PM

naah

too old for much rnr

schultzsch · 3rd January 2013, 04:59 PM

A journey started a long time ago...

hope to finish it soon

Happy New Year to all!!

buzzforb · 3rd January 2013, 05:21 PM

excellent job so far.

schultzsch · 3rd January 2013, 06:05 PM

thank you!

I would like to use 2 switches in the final product, one to turn on/off aleph ccs and the other to adjust the bias(-r27minum value -no r27 - r27 at actually value)
how can i calculate the minimum value of r27? I have the source resistors of 0.33r

5th December 2012, 05:26 PM	#1371
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	pics __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

1st January 2013, 09:45 PM	#1375
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	whoa ! will write reply ......... in few days , not after NY eve 'ts time for sandwiches and moves , these days __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

1st January 2013, 09:48 PM	#1377
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	naah too old for much rnr __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

3rd January 2013, 05:21 PM	#1379
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	excellent job so far. __________________ \|F6 Kit/Trasnformer GB Sign up sheet Closed,\|Primrose GB Sign Up sheetClick Here ...Shape the sound , Man!

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1st January 2013, 09:28 PM	#1374
albertNL diyAudio Member Join Date: Sep 2011 Location: Netherlands & Australia	I hope someone can explain some things for me. I have been looking at the manuals (user and service) of the A3, A30 and AJ and have made some notes of the differences. I then tried to relate the differences by comparing the amps schematics, but there are too many variables for a newcomer like me to explain the specifications. I hope you guys can give me a hand. Rails are about the same: A3 and A30: 25V AJ 24V Gain: A3 20dB A30 20dB (balanced) 26dB (single ended; manual explains that A30 has 6dB greater dynamic range than A3) AJ 19.6dB (does not specify a difference between balanced and single ended) I understand the higher gain of the A30 is due to the input stage. Is this correct? Power used: A3 and A30: Each channel draws about 100W but: A3 250W consumption A30 and AJ 200W consumption Question: If A3 and A30 both have each channel drawing 100W, should total consumption not be similar? Active output stage biased by current source at A3 slightly greater than 2 amps A30 slightly less than 2 amps AJ not given Max. output: A3 30W/8R, 60W/4R, 60W/2R A30 30W/8R, 40W/4R AJ 25W/8R, 13W/4R (Firstwatt product table) Question: What causes the difference between 4 Ohm output of A3 and A30? I assume it is the "slightly greater" and "slightly less" than 2A bias that is the cause. Is this assumption correct? Question: How come the AJ has so much lower power into 4 Ohm? I assumed that, since total power consumption is similar, bias must be similar. Max output A3 23V 8A A30 25V 5A AJ 21V 2.5A Questions: What causes the relative large difference between A3 and A30? Are the numbers for the AJ correct? If so, why so different from A3 and A30? Thanks, Albert

3rd January 2013, 06:05 PM	#1380
schultzsch diyAudio Member Join Date: Mar 2009	thank you! I would like to use 2 switches in the final product, one to turn on/off aleph ccs and the other to adjust the bias(-r27minum value -no r27 - r27 at actually value) how can i calculate the minimum value of r27? I have the source resistors of 0.33r

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