Jazzy_Pidjay
Well-known member
Hi everybody !
I'm finish drawing a 6072a tube microphone design.
http://img.photobucket.com/albums/v439/jazzy_pi/MicDesign.jpg
Basically it's :
- the Capsule polarization pattern of the C12
- the 6072a is biased like in the ElaM251e
- the Capsule is the one of the U87 (K67)
- Add some DC filtering
- Cinemag CM-2480 Output transformer
I think the mic will work good.
But i'm not sure of the bias resistor (250M) and grid resistor (33M) values.
* The 250M bias resistor come from the C12 schematic
(That's a 8M on the ElaM251e schematic but from the biased front electrode of the CK-12)
* The 33M grid to ground resistor come from the ElaM251e schematic
(250M+30M in the C12)
What do you think of this values ?
What improvements of the design you see ?
thank you very much :thumb:
I'm finish drawing a 6072a tube microphone design.
http://img.photobucket.com/albums/v439/jazzy_pi/MicDesign.jpg
Basically it's :
- the Capsule polarization pattern of the C12
- the 6072a is biased like in the ElaM251e
- the Capsule is the one of the U87 (K67)
- Add some DC filtering
- Cinemag CM-2480 Output transformer
I think the mic will work good.
But i'm not sure of the bias resistor (250M) and grid resistor (33M) values.
* The 250M bias resistor come from the C12 schematic
(That's a 8M on the ElaM251e schematic but from the biased front electrode of the CK-12)
* The 33M grid to ground resistor come from the ElaM251e schematic
(250M+30M in the C12)
What do you think of this values ?
What improvements of the design you see ?
thank you very much :thumb: