[Lord Soth]

 
Quote:

You could try cleaning the pins off with rubbing alcohol. ........
 
 

+1.
 
Before I install any new tubes, especially NOS ones which have been unused for over 5 to 6 decades, I clean all the pins wth >90% alcohol.
 
These are available from pharmacies under "medical" alcohol.
 
The yucky greenish oxides are removed easily via the use of alcohol.
 

 

[Vma5]

Thank you for the tips, I'll try those. I just received message from schiit and they are sending me new pair of tubes. I have to say, that they have really great customer service.

 

[cjg3]

Have hum with most tube's bought used some like red tipped tesla +yellow crossed sword, different brand cca's are dead quite matching issue? irritating