Hi guys. I spent last few days collecting values from pics on the web, and other resources to make simple layout for this project.
Now that i actually have made the mic in Sterling Audio st51 body i can confirm that it works great. I used regular chinese power supply modded to 120v. I did make a cardioid only version though
I chose this project because of simple pcb that can be easily built on perfboard, not a lot of components, and widely available capsule.
I used perfboard but high impedance part is floating in mine.
I used russian 6n16b-v tube in paralel.
I even used stock st51 transformer which is 5:1 but that caused some high end roll off. With this capsule it works great, so i kept it. After FoxAudio measurements the original has it as well
I believe original is 11:1
Some values vary in diferent pcb versions. Mostly high value resistors.
I couldn't find electrolytic cap value, but if it's like in Copperhead it should be 47uF.
I used info on bias, original tube, thd, pictures, etc from:
http://www.foxaudioresearch.ca/ar-51.htm
I hope people will get my hieroglyphics...
Now that i actually have made the mic in Sterling Audio st51 body i can confirm that it works great. I used regular chinese power supply modded to 120v. I did make a cardioid only version though
I chose this project because of simple pcb that can be easily built on perfboard, not a lot of components, and widely available capsule.
I used perfboard but high impedance part is floating in mine.
I used russian 6n16b-v tube in paralel.
I even used stock st51 transformer which is 5:1 but that caused some high end roll off. With this capsule it works great, so i kept it. After FoxAudio measurements the original has it as well
I believe original is 11:1
Some values vary in diferent pcb versions. Mostly high value resistors.
I couldn't find electrolytic cap value, but if it's like in Copperhead it should be 47uF.
I used info on bias, original tube, thd, pictures, etc from:
http://www.foxaudioresearch.ca/ar-51.htm
I hope people will get my hieroglyphics...