[rb2013]

  So i don't have a schiit Valhalla, but iv'e got different OTL which basis on 6N1P and 6N6P tubes too.
 
But i'm very confused about brand tubes i have. 
 
I have no 3 pairs of tubes - 6N1P - EW, 6N6P, 6N1P - WI. All of them have inscription "OTK", and rhombus in the logo - looks like logo of Foton or old Reflector logo. But in this rhombus is also number "6". I can't find this logo brand anywhere. Maybe You know what is it?

Do you have some pictures?

 

[truly194]

 
 
This is my 6N1P - WI. The same logo on all of my russian tubes.
 
I have also box for them, but im not shure if this is original box.
 

 

[rb2013]

 
 
 
This is my 6N1P - WI. The same logo on all of my russian tubes.
 
I have also box for them, but im not shure if this is original box.
 

Any other date codes or marking (like 6H1N)?  By the dual straight wire getter posts they look to be very early to mid 60's Nevz - or Novosibirsk

 

[Oskari]

 

 
That's the newer NEVZ symbol; should be on the tubes as well.

 

[Oskari]

   I have no 3 pairs of tubes - 6N1P - EW, 6N6P, 6N1P - WI. All of them have inscription "OTK", and rhombus in the logo - looks like logo of Foton or old Reflector logo. But in this rhombus is also number "6". I can't find this logo brand anywhere. Maybe You know what is it?

 
It's a quality control mark.

 

[truly194]

OK
 
so how i can get know what fabric made this tubes?
 

   
That's the newer NEVZ symbol; should be on the tubes as well.

 
The NEVZ logo is in different way

 

[Oskari]

  OK
 
so how i can get know what fabric made this tubes?
 
 
The NEVZ logo is in different way

 
No, it isn't. 

 
That's NEVZ-Soyuz of Novosibirsk.
 
Novosibirskii elektrovakuumnyi zavod "Soyuz" in full.

 

[truly194]

Oh, come on. Based on picture from this topic it looks different.  It is wrapped in different way
 
On the tube :
 
"6H1U - BN" - in cyrylica. The "U" is downside up.
And in the enxt line : "90 'symbol like ont eh box' 10"

 

[Oskari]

 

 
That is the correct way…
 

  Oh, come on. Based on picture from this topic it looks different.  It is wrapped in different way

 
… and the different way is wrong. 

 

  "6H1U - BN" - in cyrylica. The "U" is downside up.
And in the enxt line : "90 'symbol like ont eh box' 10"

 
1990 NEVZ then.

 

[truly194]

 
Look again

 

[Oskari]

 

 
Correct on the left, mistaken on the right.

 

[truly194]

Ok, checked on the other site and this is it
 
What producents are You reccomend? i want 6N1P and 6N23P.

 

[BleaK]

Have a pair of 60's Foton 6N6P and some 70's Reflector (I think) 6N23P-EV on the way, looking forward to testing and hearing some new tubes  

 

[BleaK]

60's Fotons 6N6P in and have 10 hours of them. Some subtle improvements for sure, but standing out is a slight fuller lower midrange/upper bass. Really worthwhile upgrade for some cheap tubes.

 

[Melange]

Hi guys, I was wondering if someone could give me a tube recommendation. I've had a Valhalla 2 for a couple of months, and while I'm mostly satisfied with it, I find that it can be lacking in both power and extension in the bass (particularly the sub-bass), and has a slight glare (for lack of a better word) in the upper midrange and treble. Is there a tube out there that can rectify these two issues without breaking the bank? A price of under €150 for a pair would be ideal. Thanks.