Aleph 3 balanced input

Odysei · 30th May 2005, 01:47 PM

I can't find any thread with Aleph 3 balanced input schematics. I believe that it have already been discussed, but still can I ask for help?

I need to get Aleph 3 working with balanced input. As I can't find a suggestion I made my try. Will these my schematics drive Aleph 3 with balanced input or some values should be changed?

I need not to loose its original gain of 20db or make sounding worse, in fact few additional db won't be a bad idea.

Billc · 30th May 2005, 01:52 PM

Look at the volksamp 30 on the Pass DIY site. Bill

fcel · 30th May 2005, 01:56 PM

Go here http://www.passlabs.com/downloads.htm Schematic is on page 16 under Aleph 30.

hifimaker · 30th May 2005, 06:36 PM

Was the Aleph 3 (not Aleph30) ever manufactured with balanced inputs from the Pass Labs factory?

I thought there was such a version, perhaps a later version?

Thanks,

-David

Odysei · 31st May 2005, 11:10 AM

I know about Aleph 30, but I'm not interested in one. I need schematic update for Aleph 3 for balanced input support.

I made my try in the earlier post by converting Aleph 30 schemes to almost Aleph 3, but I'm not sure how will that work with Aleph 3

Could someone suggest something??

Nelson Pass · 31st May 2005, 06:28 PM

Quote:

Originally posted by dw8083
Was the Aleph 3 (not Aleph30) ever manufactured with balanced inputs from the Pass Labs factory?

I thought there was such a version, perhaps a later version?

The factory did not make a balanced Aleph 3, but you can easily
use the Aleph 30 input without penalty.

Odysei · 31st May 2005, 07:25 PM

Quote:

Originally posted by Nelson Pass

you can easily
use the Aleph 30 input without penalty.

Hm, and what about input gain? How will it change from standart Aleph 3, using 30's input?

Nelson Pass · 31st May 2005, 10:43 PM

Quote:

Originally posted by Odysei
what about input gain? How will it change from standart Aleph 3, using 30's input?

It's the same as I recall. The SE input impedance is higher on
the 30, but the BAL input is lower.

mastertech · 31st May 2005, 11:50 PM

mr Pass you dont use coupling caps at the input while others do
is it because you assume that the preceding preamp is using caps or
is biased at oV for dc coupling
i am confused what is the standard who assumes what the other
is using, however to be 100% sure shouldnt you use coupling cS
at the input?

Nelson Pass · 1st June 2005, 08:04 PM

I do use a coupling cap in the feedback loop to reduce
the gain at DC. The circuit works fine without it, although
the offset is higher, its drifts more, and of course you want
to be careful about offset in the source.

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30th May 2005, 01:52 PM	#2
Billc diyAudio Member Join Date: Jun 2002 Location: CT	Look at the volksamp 30 on the Pass DIY site. Bill

30th May 2005, 01:56 PM	#3
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	Go here http://www.passlabs.com/downloads.htm Schematic is on page 16 under Aleph 30.

30th May 2005, 06:36 PM	#4
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	Was the Aleph 3 (not Aleph30) ever manufactured with balanced inputs from the Pass Labs factory? I thought there was such a version, perhaps a later version? Thanks, -David

31st May 2005, 11:10 AM	#5
Odysei diyAudio Member Join Date: Jun 2004 Location: Vilnius	I know about Aleph 30, but I'm not interested in one. I need schematic update for Aleph 3 for balanced input support. I made my try in the earlier post by converting Aleph 30 schemes to almost Aleph 3, but I'm not sure how will that work with Aleph 3 Could someone suggest something??

31st May 2005, 11:50 PM	#9
mastertech Banned Join Date: Mar 2005 Location: Australia	mr Pass you dont use coupling caps at the input while others do is it because you assume that the preceding preamp is using caps or is biased at oV for dc coupling i am confused what is the standard who assumes what the other is using, however to be 100% sure shouldnt you use coupling cS at the input?

1st June 2005, 08:04 PM	#10
Nelson Pass The one and only Join Date: Mar 2001	I do use a coupling cap in the feedback loop to reduce the gain at DC. The circuit works fine without it, although the offset is higher, its drifts more, and of course you want to be careful about offset in the source.

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