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Old 5th December 2012, 05:26 PM   #1371
Zen Mod is offline Zen Mod  Serbia
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pics
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Old 5th December 2012, 06:00 PM   #1372
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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 :-) )
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Old 5th December 2012, 06:06 PM   #1373
kroyin is offline kroyin  India
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& the outside,even better :-)
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Old 1st January 2013, 09:28 PM   #1374
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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
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Old 1st January 2013, 09:45 PM   #1375
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whoa !

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

'ts time for sandwiches and moves , these days

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Old 1st January 2013, 09:46 PM   #1376
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Quote:
Originally Posted by Zen Mod View Post
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.
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Old 1st January 2013, 09:48 PM   #1377
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naah

too old for much rnr
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Old 3rd January 2013, 04:59 PM   #1378
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A journey started a long time ago...
hope to finish it soon

Happy New Year to all!!
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Old 3rd January 2013, 05:21 PM   #1379
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excellent job so far.
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Old 3rd January 2013, 06:05 PM   #1380
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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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