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Snorkeltjes 25th September 2006 08:27 PM

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.



jacco vermeulen 25th September 2006 09:53 PM

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.

Snorkeltjes 25th September 2006 10:37 PM

Mark Levinson no:29
Do you know what the bias reading should be for this amp

jacco vermeulen 26th September 2006 01:12 AM

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.

Snorkeltjes 26th September 2006 08:46 PM

Thanxs Jacco

sparkle 23rd November 2007 11:54 AM

i have somewhere a note that you have a total bias current of the output stage arround 120mA???!!

ppa 23rd November 2007 01:28 PM

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.

sparkle 23rd November 2007 01:45 PM

thanks - my mail is

thanks :)
many regards

askchan 23rd November 2007 02:38 PM

Please send me the mark levison 29 schematic also.
My email address is

best regard

si_jopie0382 23rd November 2007 04:36 PM


Can you send it to me too at :


Thanks in advance

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