I have a question about these micro tube mic ?

[mic test]

I have a question about these micros
what is it tube mic why doesn't it have 7 pin like normal tube mics? and does that actually do anything? I would buy one and then install better components to reduce the noise. Do you think it's worth it? I have a lot of tube mics but I've never seen anything like this
https://www.alibaba.com/product-det...l?spm=a2700.shop_plgr.41413.93.63837121qRZkHk

 

[rock soderstrom]

I have a question about these micros
what is it tube mic why doesn't it have 7 pin like normal tube mics? and does that actually do anything? I would buy one and then install better components to reduce the noise. Do you think it's worth it? I have a lot of tube mics but I've never seen anything like this
https://www.alibaba.com/product-det...l?spm=a2700.shop_plgr.41413.93.63837121qRZkHk

For me it looks like the tube is just decoration.

I only see 3 cables coming from the XLR socket...

 

[OneRoomStudio]

It looks like the only connections to the tube PCB are mechanical. In other words...the tube isn't even connected to the circuit. Plus, the transistor board on the other side sure looks like an amplifier.

 

[OneRoomStudio]

The funniest part is that with that setup, the tube wouldn't even light up (there's no filament voltage), despite the glowing tube in the picture.

 

[rock soderstrom]

The funniest part is that with that setup, the tube wouldn't even light up (there's no filament voltage), despite the glowing tube in the picture.

That's magic based on a few orange LEDs

 

[k brown]

I call these Toobe microphones.

 

[mic test]

Isn't it possible to build a tube mic with only 3 pin XLR? with one

 

[rock soderstrom]

Isn't it possible to build a tube mic with only 3 pin XLR? with one

It's not completely impossible, but it does require a few mental pull-ups. The biggest limitation is the 48V phantom power and its limited amount of current. There have already been projects in this direction, but in my opinion it is not worth the effort. The mic shown is 100% not one of them, its totally Toobe fake.

 

[mic test]

It should be possible to have a miniature tube
to put it into this circuit or am I wrong?

Hex Inverter Voltage Multiplier for Condenser Microphones​

https://www.pcbway.com/project/shar...age_Multiplier_for_Condenser_Microphones.html

This is a HEX CMOS inverter based voltage multiplier. It is used for condenser microphone biasing. It takes 12VDC in and turns it into up to 80VDC. For 60VDC

 

[mic test]

Do you have a link to the other projects?

 

[rock soderstrom]

Do you have a link to the other projects?

check the search function here on groupdiy

we have talked about a similar mic here

A commercial product from Microtech Gefell UM 900

 

[k brown]

Weren't there some tubes used in battery-operated radios that could work at low B+ voltages?

 

[rock soderstrom]

Weren't there some tubes used in battery-operated radios that could work at low B+ voltages?

I know ECC86 and EF98, which work quite well with low B+ but require a lot of heater current. Tubes for hearing aids are more suitable, but don't sound particularly good in my opinion. Your mileage may vary...

 

[mic test]

OK, that's very cool
Microtech Gefell UM 900
Are there any circuit diagrams for which circuit?

 

[MagnetoSound]

On the other hand it is cheap, and the components are basically there. A 7-pin insert and a bit of rewiring, and a tube mic is actually possible for very little. If the transformer is real!

 

[mic test]

Would it be possible for someone to make me a circuit like this for €100?

 

[pasarski]

I have a question about these micros
what is it tube mic why doesn't it have 7 pin like normal tube mics? and does that actually do anything? I would buy one and then install better components to reduce the noise. Do you think it's worth it? I have a lot of tube mics but I've never seen anything like this
https://www.alibaba.com/product-det...l?spm=a2700.shop_plgr.41413.93.63837121qRZkHk

I think this one you posted in another thread is even more intriguing. Wonder what the device is? Maybe a nuvistor? Also doesn't seem to be connected.

 

[Khron]

Maybe a nuvistor?

Weren't nuvistors small and metal-cased?

 

[pasarski]

Weren't nuvistors small and metal-cased?

I think so. But the thing inside looks like a nuvistor. It seems the designation starts with 6L.

 

[MagnetoSound]

Yeah, that’s not a nuvistor. Just a random TV tube probably,