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Old 30th October 2007, 05:05 PM   #1
gl is offline gl  United States
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Join Date: Dec 2003
Location: Sierra Foothills - California
Default Looking for updated A40 schematic.

I understand that there was an article in the Audio Amateur that presented an update the A40. It would have been in the late '80's or early '90's. I am not referring to the A75.

I am trying to determine 1) which back issues to order from AudioXpress and 2) if the article really is relevant. It would be nice to see a schematic before spending any money.

Thanks in advance to everyone.

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Old 31st October 2007, 12:49 AM   #2
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Join Date: Oct 2003
Location: Atlanta
MOSFET outputs for an A-40?
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Old 31st October 2007, 03:34 PM   #3
gl is offline gl  United States
diyAudio Member
Join Date: Dec 2003
Location: Sierra Foothills - California
Thank you gpsmithii. I think it was that 6 part article I was looking for. Unfortunately it's right in the area where my collection of AA's and AX's has a hole. Would you know of a place where the schematic is available on-line? I would like to preview it before buying 6 back issues.

Again thank you.

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Old 27th November 2007, 12:56 PM   #4
rehad is offline rehad  Turkey
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Join Date: Mar 2006
Location: Istanbul

I have read the a40 original document and saw that the damping factor stated at near the value of 300 . It looks quite high. it shouldn't be this much because of output resistor values which are 0.68 ohm . In theory it should be near 50 .

( 0.68 / 4 = 0.17 ) , Damping factor at 8 ohms = 8 / 0.17 = 47

Is there anybody can explain this ?

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