AKG C3000 TO Tube Mic Mod..

[commanderberti]

sounds great, the T47 (Behringer) tube circuit are perfekt für the AKG C3000 Capsule.. see the steps..

 

[micolas]

@commanderberti
That's an interesting idea!
What can you say about the self-noise?
With the C3000b capsule, the SNR will improve a bit, but the stock T-47 had maybe over 20dB of noise with the original small electret.

 

[k brown]

@commanderberti
That's an interesting idea!
What can you say about the self-noise?
With the C3000b capsule, the SNR will improve a bit, but the stock T-47 had maybe over 20dB of noise with the original small electret.

With the AKG capsule SNR will improve a LOT!

 

[micolas]

With the AKG capsule SNR will improve a LOT!

That's exactly what I thought, but the headroom will decrease.

 

[commanderberti]

That's exactly what I thought, but the headroom will decrease.

exact , i will test it on weekend.. with the c3000 capsule the output is much higher.. i will test the headroom.. and test it with lower gain tubes.. results i post here.. cu

 

[commanderberti]

here you can see how i mecanical fit them together..

 

[commanderberti]

here the schematic .. T1 is near by T47 ..

 

[micolas]

exact , i will test it on weekend.. with the c3000 capsule the output is much higher.. i will test the headroom.. and test it with lower gain tubes.. results i post here.. cu

ECC83/12AX7 is a high-gain valve
(μ approximately 100) and has an anode impedance of 62,000 Ω.
ECC81/12AT7 is a medium to high gain valve (μ approximately 60) and has an anode impedance of 10,000 Ω
ECC82/12AU7 is a low-gain valve
(μ approximately 17) and has an anode impedance of 7,700 Ω.

 

[micolas]

@commanderberti
In another discussion group about tubes the following remark is made:
12AT7 has more focus on mids
12AU7 is pretty flat