6922 AR LS7

[audio3]

Hello everyone! I would like to propose a question about a 6922 valve. I recently purchased a used Audio Research LS7, after a few hours
of listening, turning the preamp back on I heard a hum in the speakers.
I started trying to disconnect the various connected electronics until
the only preamp remains, it was he who generated the noise. after a
visual analysis I noticed that valve 4 was like in the photo. The valve is a sovtek. Has it reached the end of its life?

Thanks to those who can answer me!

Good music

Giorgio

 

[audio3]

Sorry I forgot the photo ...

 

[TG]

White getter means that the tube isn't hermetically sealed anymore. There must be a crack somewhere.
And yes, it is useless now.

 

[jean-paul]

That is one of the reasons NOS/NIB tubes are often better

 

[waltube]

The problem is mainly about the method to insert the tubes in a socket. In AR stuff the socket are strong and the insertion is not fast and easy

It is not a problem of NOS or new.


Walter

 

[audio3]

Indeed the valves have been removed and reinserted ... Thank you!