LM317 on the mic G7

[thom]

i I had gone up back to front the LM317. Now the tube warms and the microphone works. I have important background noise and I have only 130V instead of 160V. :thumb:

 

[gyraf]

130V is fine for the G7 - don't worry about it.

What sort of noise do you have?

Hum=poor grounding (common)
Buzz=too open head basket (common)
Hiss=bad tube (rare)

Jakob E.

 

[thom]

I think it's Hum, the noise are constante in cardio onni or eight. When i put my hand on the lundall it's better but not enough.

 

[zebra50]

When i put my hand on the lundall it's better but not enough.

Is this mic inside a metal body? The circuit will hum badly if it is not surrounded by a metal screen.

 

[thom]

I try the micro outside the meta body !!! :!: , I did not know that the body of the microphone can reduce the noise.

:? Thom

 

[thom]

Thank for all advices, the mic works and the bad noise are stop with the body Spécial :thumb: to Gyraf

Thom :guinness:

 

[gyraf]

I'm happy that you got that sorted!

:thumb:

Jakob E.