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Old 25th September 2006, 08:27 PM   #1
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Default Mark Levinson no:29

Does anyone know which transistors are used in the output stage of the Mark Levinson 29?
I want to check the bias settings in this amp.
Does anyone know where i can get a schematic.

Thanx

JP
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Old 25th September 2006, 09:53 PM   #2
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MJ15024/MJ15025.
But you should be able to read the TO3s on the funny heatsinks of the 29.
ML didn't make a mystery of the type of devices used.
Not on the 20, not on the 23, also not on the 27 and 29.
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Old 25th September 2006, 10:37 PM   #3
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Default Mark Levinson no:29

Do you know what the bias reading should be for this amp
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Old 26th September 2006, 01:12 AM   #4
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The ML 29 is a regular class AB amplifier.

Because the heatsinks is only folded metal plating the bias is set just high enough to avoid cross-over distortion.
Put a DMM across the emitter resistor of any one of the 4 output devices and adjust between 25 and 35 mV.
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Old 26th September 2006, 08:46 PM   #5
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Thanxs Jacco
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Old 23rd November 2007, 11:54 AM   #6
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i have somewhere a note that you have a total bias current of the output stage arround 120mA???!!
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Old 23rd November 2007, 01:28 PM   #7
ppa is offline ppa  Italy
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I have the mark levison 29 schematic but the file is too much big for sending it by the forum, if you could give me your email I can send it to you, moreover I can help you for setting the bias.
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Old 23rd November 2007, 01:45 PM   #8
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thanks - my mail is

mukihrATyahoo.com


thanks
many regards
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Old 23rd November 2007, 02:38 PM   #9
askchan is offline askchan  Hong Kong
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Please send me the mark levison 29 schematic also.
My email address is askchan@netvigator.com

best regard
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Old 23rd November 2007, 04:36 PM   #10
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Hi,

Can you send it to me too at :

si_jopie0382(@)yahoo.com

Thanks in advance
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