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Old 9th October 2010, 05:07 PM   #31
Michael Koster is offline Michael Koster  United States
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Originally Posted by imagios View Post
Ok since I able to solder it but nor realy able to decide what resistors to change to what value, what if I would just swap the manufacturer stay with the 12AX7 but instead of a chinies tube I would buy a russian, would that work or still I would need to change some resistors?
The brand of tube here is not as important as the type. Going to a 12AU7 just to get a Telefunken tube in there is not likely to be the best approach to improve this mic.

Any 12AX7 should work the same in the circuit without changes. A 12AX7 should bias to about 0.5 mA plate current. You may need to try more than one tube regardless of which brand due to minute gas in some samples. Look for about 40-60V drop across the 100K plate resistor. (A 12AU7 will bias up to 1.2mA or so and would likely not work as well).

For myself I would use a 12AY7/6072 AND drop the B+ of the mic down from the stock 200V to 120V. I don't know why they go to 200V on these; it places 100V on the capsule where 60V is standard for most LD capsules (inclusing the Peluso etc.).


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Old 20th November 2010, 03:19 AM   #32
Garyepe is offline Garyepe  China
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Default FET Capsule have two types Inner or without FET

As I know the Electret Condenser Microphone has two types Right now.

Inner FET type :
With this type, the FET is inner the capsule, which is SMD backside of the MIC' PCB. And the FET is MosFET .

Without FET type
Wtih this Type, Inner side do not have MOSFET. Engineer need make the FET on the main board,and the main board must connect with the ECM.

Please check the above links, Check the Schematic Diagram
You can find these two types are different.

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Old 20th November 2010, 03:56 AM   #33
taj is offline taj  Canada
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I'm a bit surprised the Aurycle schematic uses only half a 12AX7. NOS AX7's are getting insanely expensive. If he designed with a single triode tube (6EU7? or 6AV7? -- I'm trying to remember) then you get the same specs for 1/5 the price for NOS.

On the other hand, I realize you can't find these at your local music store. I guess I'd just have done it differently, being a hardcore DIY'er.

From ChrisA
You were planning to build tow for stereo recording, people typically don't record a vocalist in stereo. They pan the track to stereo in the mix later, same for most instruments. Stereo might be used to record an ensomble
Chris, we used to record a lot of instruments in stereo, and vocals too. If you've got the mics and the tracks, USE THEM. The difference in outcome is worthwhile if you're working on nice music. There are some instruments where it would be a travesty not to use stereo mics; acoustic guitars for one, off the top of my head.


Last edited by taj; 20th November 2010 at 04:04 AM.
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