2 questions on the aleph-p

jarthel · 10th July 2007, 11:55 PM

Hello. hoping you could help with the questions below

1. is this thread (http://www.diyaudio.com/forums/showt...414#post276414), Mr. Pass has said that it is okay to short the output to ground. Does it matter if it's before the volume control or after? I only intend to short the output to ground for a few millisecs after turn-on and would immediately switch back to normal output.

2. in the original aleph-p, is the relay attenuator comparable to series, ladder or shunt stepped attenuator? I did see the schematics on the service manual and it looks like a shunt. But I want to confirm.

Thank you for the reply.

Stefanoo · 11th July 2007, 07:32 AM

1. WHY?????? Why would you want to shor the output for a millisec?
You have to put a relay on the output and and timing circuit (RC or something else) to control the switching of it....and you definitely degrade the sonically quality.
If the initial bumb is what you're being concerned....you switch the preamp on first and then the amp and you figure this problem out without having to use those artificial methods.

2. the attuenuator is a shunt type, but you can implement a better ladder type....but i don't suggest you...is more expencive and it takes more time and space to implement it and it brings with it many issues.
I don't understand your first question....

jarthel · 11th July 2007, 10:24 AM

Quote:

Originally posted by Stefanoo
1. WHY?????? Why would you want to shor the output for a millisec?
You have to put a relay on the output and and timing circuit (RC or something else) to control the switching of it....and you definitely degrade the sonically quality.
If the initial bumb is what you're being concerned....you switch the preamp on first and then the amp and you figure this problem out without having to use those artificial methods.

normally, the output is shorted to ground. on the same relay pin the pcb output is soldered, I have soldered the wires going to the rca/xlr connector. when the relay triggers the connection to ground is broken thus rca/xlr connectors work as intended.

Nelson Pass · 11th July 2007, 05:55 PM

Nevertheless, because the active stage is simply a current
source, it doesn't care what the impedance at the output is,
so shorting before or after the volume control creates no
issues.

jarthel · 11th July 2007, 08:24 PM

Quote:

Originally posted by Nelson Pass
Nevertheless, because the active stage is simply a current
source, it doesn't care what the impedance at the output is,
so shorting before or after the volume control creates no
issues.

thank you very much

10th July 2007, 11:55 PM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	2 questions on the aleph-p Hello. hoping you could help with the questions below 1. is this thread (http://www.diyaudio.com/forums/showt...414#post276414), Mr. Pass has said that it is okay to short the output to ground. Does it matter if it's before the volume control or after? I only intend to short the output to ground for a few millisecs after turn-on and would immediately switch back to normal output. 2. in the original aleph-p, is the relay attenuator comparable to series, ladder or shunt stepped attenuator? I did see the schematics on the service manual and it looks like a shunt. But I want to confirm. Thank you for the reply.

11th July 2007, 07:32 AM	#2
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	Re: 2 questions on the aleph-p 1. WHY?????? Why would you want to shor the output for a millisec? You have to put a relay on the output and and timing circuit (RC or something else) to control the switching of it....and you definitely degrade the sonically quality. If the initial bumb is what you're being concerned....you switch the preamp on first and then the amp and you figure this problem out without having to use those artificial methods. 2. the attuenuator is a shunt type, but you can implement a better ladder type....but i don't suggest you...is more expencive and it takes more time and space to implement it and it brings with it many issues. I don't understand your first question.... __________________ Stefano

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11th July 2007, 05:55 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Nevertheless, because the active stage is simply a current source, it doesn't care what the impedance at the output is, so shorting before or after the volume control creates no issues.

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