Mark Levinson no:29

Snorkeltjes · 25th September 2006, 08:27 PM

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

jacco vermeulen · 25th September 2006, 09:53 PM

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.

Snorkeltjes · 25th September 2006, 10:37 PM

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

mukihrATyahoo.com

thanks

many regards

askchan · 23rd November 2007, 02:38 PM

Please send me the mark levison 29 schematic also.
My email address is askchan@netvigator.com

best regard

si_jopie0382 · 23rd November 2007, 04:36 PM

Hi,

Can you send it to me too at :

si_jopie0382(@)yahoo.com

Thanks in advance

25th September 2006, 08:27 PM	#1
Snorkeltjes diyAudio Member Join Date: Sep 2006	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

25th September 2006, 09:53 PM	#2
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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. __________________ Not so much,.......if it says "ZM" in the corner.

25th September 2006, 10:37 PM	#3
Snorkeltjes diyAudio Member Join Date: Sep 2006	Mark Levinson no:29 Do you know what the bias reading should be for this amp

26th September 2006, 01:12 AM	#4
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	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. __________________ Not so much,.......if it says "ZM" in the corner.

23rd November 2007, 01:28 PM	#7
ppa diyAudio Member Join Date: Mar 2005 Location: Italy	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. __________________ PP


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26th September 2006, 08:46 PM	#5
Snorkeltjes diyAudio Member Join Date: Sep 2006	Thanxs Jacco

23rd November 2007, 11:54 AM	#6
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...	i have somewhere a note that you have a total bias current of the output stage arround 120mA???!!

23rd November 2007, 01:45 PM	#8
sparkle diyAudio Member Join Date: Oct 2003 Location: middle of nowhere...	thanks - my mail is mukihrATyahoo.com thanks many regards

23rd November 2007, 02:38 PM	#9
askchan diyAudio Member Join Date: Sep 2007	Please send me the mark levison 29 schematic also. My email address is askchan@netvigator.com best regard

23rd November 2007, 04:36 PM	#10
si_jopie0382 diyAudio Member Join Date: Jun 2007	Hi, Can you send it to me too at : si_jopie0382(@)yahoo.com Thanks in advance

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