GEFELL RFT MV101 Mod?

[smilan]

Hi,
I have a GEFELL RFT MV101 mic with MK102 capsule.
I've built a custom PSU with a balanced output using a NEUTRIK NTM4 transformer.
The mic works good, but I feel like it missing some high frequencies.
There's a way to boost the frequencies above 10K Hz in this mic by changing some components?




As you can see at this picture, the AKG C451 EB have much more high frequencies comparing to the MV101.

 

[rock soderstrom]

The mic works good, but I feel like it missing some high frequencies.

It is a measurement microphone without treble boost, nicely linear. Maybe that's just the way it is and has to be accepted.
At first glance, I don't see any built-in EQ for the treble.

I've built a custom PSU with a balanced output using a NEUTRIK NTM4 transformer.

Are you using the Neutrik transformer reverse as a 4:1?

 

[smilan]

It is a measurement microphone without treble boost, nicely linear. Maybe that's just the way it is and has to be accepted.
At first glance, I don't see any built-in EQ for the treble.

Yes, I guess I'll use it as it was designed...

Are you using the Neutrik transformer reverse as a 4:1?

Yes, I'm taking the output from the primary side.

 

[rock soderstrom]

Yes, I guess I'll use it as it was designed...

Yep, that seems to be the best way. How does the mic behave with an external EQ? I like a nice inductor EQ for something like this to make the treble shine.

 

[smilan]

How does the mic behave with an external EQ? I like a nice inductor EQ for something like this to make the treble shine.

It works well, I have an Auditronics 6010 preamps with a nice inductor EQ and with a 3db boost at 12K it sounds much nicer (at list for a drum overheads mic).

 

[chacondar]

Have you tried with other transformers? Like Lundahl LL1527?
It has a ratio of 2:1 and brings the impedance to 150 ohms.

 

[smilan]

Have you tried with other transformers? Like Lundahl LL1527?
It has a ratio of 2:1 and brings the impedance to 150 ohms.

No, I did not tried the Lundahl LL1527 since I don't have one here, I'll order one as soon as I'll need some other transformers from Lundahl.

 

[kaltavilla]

Would you be so kind to post your power supply build? I'm sure a number of us would benefit from seeing how you built it and what components you used. Many thanks !

 

[smilan]

Would you be so kind to post your power supply build? I'm sure a number of us would benefit from seeing how you built it and what components you used. Many thanks !

Sure, I used the schematic I found on this website: https://www.elektroakustika.cz/zdroj.html

 

[thor.zmt]

There's a way to boost the frequencies above 10K Hz in this mic

Yes.

On your mixer is a control labelled "HF EQ" (or treble etc). To quote Brian Wilson " you turn it all the way to the right for a hype sound!"

Thor