Resistor R! for Aleph 60

redwine1118 · 27th September 2003, 10:52 AM

Dear Friends,

I have got an Audio note (two stage 6072A) line amp. on hand which makes some modification on the coupling capacitor. I like this as it is so simple in configuration and the sound really nice.

I am now going to bulid up a power amp. PassDIY Aleph 60 seems to be the goals. Running at Class A with a 2 stage of amplification.

Can anyone adivse me the following :

1) I have got the cct. diagram of Aleph 60 but the diagram does not mention the value for R1 , do anyone have any idea?

2) Do you have some great idea on the PCB layout?

3) I would like to use the RMA carbon resistor, will it be making the amplifier more musical (actually thats what I want)

4) Good tips in building this amp.?

Like to hear your advise.

Redwine

Nickolas K. · 27th September 2003, 01:31 PM

You can live without R1.
And if you match the input mosfets very closely you can also live without R8.

Nick

Ionizer · 23rd February 2005, 11:47 PM

And if I dont match the input mosfets very closely, how is R1 and R8 used to compensate?

What are resonable values?

Nelson Pass · 24th February 2005, 12:43 AM

One of them, I forget which, allows you to trim the DC offset
if you wish. The other reduces ripple noise by injecting a
little bit of noise from the supply out of phase. Both are
high values, like 100K for instance.

Both can be left off, and neither is significant with regard to
the sound itself.

27th September 2003, 10:52 AM	#1
redwine1118 diyAudio Member Join Date: Sep 2003 Location: Hong Kong	Resistor R! for Aleph 60 Dear Friends, I have got an Audio note (two stage 6072A) line amp. on hand which makes some modification on the coupling capacitor. I like this as it is so simple in configuration and the sound really nice. I am now going to bulid up a power amp. PassDIY Aleph 60 seems to be the goals. Running at Class A with a 2 stage of amplification. Can anyone adivse me the following : 1) I have got the cct. diagram of Aleph 60 but the diagram does not mention the value for R1 , do anyone have any idea? 2) Do you have some great idea on the PCB layout? 3) I would like to use the RMA carbon resistor, will it be making the amplifier more musical (actually thats what I want) 4) Good tips in building this amp.? Like to hear your advise. Redwine

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27th September 2003, 01:31 PM	#2
Nickolas K. diyAudio Member Join Date: Apr 2002 Location: Athens	You can live without R1. And if you match the input mosfets very closely you can also live without R8. Nick

23rd February 2005, 11:47 PM	#3
Ionizer diyAudio Member Join Date: Oct 2002 Location: Sweden	And if I dont match the input mosfets very closely, how is R1 and R8 used to compensate? What are resonable values?

24th February 2005, 12:43 AM	#4
Nelson Pass The one and only Join Date: Mar 2001	One of them, I forget which, allows you to trim the DC offset if you wish. The other reduces ripple noise by injecting a little bit of noise from the supply out of phase. Both are high values, like 100K for instance. Both can be left off, and neither is significant with regard to the sound itself.