Help - pre ARC

[baudouin0]

Just so I am not confused is the volume control before or after the line section?

 

[waltube]

Thanks Steve
Update : I have changed the four 6h30 in line section and now the noise is greatly improved
This objects are strange , in my pre volume not influence hiss , even at max level .

The volume is ahead the output circuit so the noise is always there even the pot is at max attenuation
As I wrote you it is a tube issue
The 6h30 and 6n6 need to be well selected also for noise floor, micro phonic and gain

Walter

 

[Antonio65]

Ah ma sei italiano !!! Dove posso trovare delle 6h30 low noise ?

 

[waltube]

Ask directly to importer in Italy. (Audionatali) It is the best way
Otherwise you risk to get not s good results
In every case the selection on board is the best way

Ps: manda messaggio privato

 

[baudouin0]

If you have a lot of gain which it sounds like you have placing a fixed resistive attenuator between the pre and power amp will reduce noise.

 

[waltube]

This preamp hasn't an high gain.
The problem, white noise, is always related to the tubes.
In some case, but you have some random "pops", it is related to plate resistor.

Walter

 

[Antonio65]

I’ll try with my Marantz sr8015 in order to verify if gain cause this problem