A question about the Malanz 7

planar8514 · 9th November 2010, 12:47 AM

Hi:
I have a question about the Malanz 7. When I learned the schematic, I found that the bias current of the first 12AX7 was very small. As the cathode resistor is 4.7k, the current should be less than 1mA. I run a simulation with the Multisim, and found that it was only 360uA. I was not sure why the bias was set like this. 1mA was better based on the curve. Is there anyone that can help me to explain it? Thank you!

azazello · 9th November 2010, 04:06 AM

Normaly in brand schematics brands "make" mistakes....

I think that You can adjust current about 1 -1,5 ma with decreasing plate and cathode resistors. But You can try both variants....

9th November 2010, 12:47 AM	#1
planar8514 diyAudio Member Join Date: Nov 2010 Location: China	A question about the Malanz 7 Hi: I have a question about the Malanz 7. When I learned the schematic, I found that the bias current of the first 12AX7 was very small. As the cathode resistor is 4.7k, the current should be less than 1mA. I run a simulation with the Multisim, and found that it was only 360uA. I was not sure why the bias was set like this. 1mA was better based on the curve. Is there anyone that can help me to explain it? Thank you!

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9th November 2010, 04:06 AM	#2
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Normaly in brand schematics brands "make" mistakes.... I think that You can adjust current about 1 -1,5 ma with decreasing plate and cathode resistors. But You can try both variants....

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