[Badas]

You betcha. Have done exactly that with the WA6 however (in reverse - WA6 to WA5).  Result as above - WA6 loves the NU, WA5 hates the NU.

I'm betting that the WA6, WA6 SE, WA2 (with adapters) and WA22 will all work with the NU's. Smaller power requirements and transformers.

Probably not nessary for me to test your exact tubes. I own two sets and have rolled both with no adverse effects. As we purchased of the same seller at the same time I believe they would be from the same batch as well.

 

[TonyNewman]

 
They are no fun then I am afraid, what a shame.............

 
Might just be my clumsy hands. It's been a while...

 

[rosgr63]

Smooth talking helps too

 

[Stereolab42]

   
You betcha. Have done exactly that with the WA6 however (in reverse - WA6 to WA5).  Result as above - WA6 loves the NU, WA5 hates the NU.

 
In my case it was more like the WA5 and the NU 6F8G got along like nitro and glycerin. They must simply have been built to lower tolerances/standards of quality.
 
I will note that iglioto has yet another pair of WWII grey-glass RCA VT-231s for sale at a great price:
 
http://www.ebay.com/itm/Two-RCA-VT-231-JAN-CRC-6SN7GT-military-issue-matching-pair-6SN7GT-/281637288659?pt=LH_DefaultDomain_0&hash=item4192e3fad3
 
I have bought so many similar pairs from this guy it isn't even funny. Somebody else jump on it or I'm going to keep buying them up.

 

[jibzilla]

6sn7w long bottle came in today. Wow what a tube. I think I may have found "the one".

 

[rosgr63]

Have you tried the short bottle, with the lower mica inside the base?

 

[dminches]

  Have you tried the short bottle, with the lower mica inside the base?

 
If you haven't you can go to the Stavros Museum and pick one up!

 

[Xcalibur255]

   
You betcha. Have done exactly that with the WA6 however (in reverse - WA6 to WA5).  Result as above - WA6 loves the NU, WA5 hates the NU.

My experience matches this.  NU tubes lose their creamy sound and become harder edged when given more voltage.  You can control this a little bit in your WA5 through choice of rectifier, unless you are running 5U4Gs already.  They have about the most voltage drop out of everything that is compatible so there is no room to go down from there.

 

[Oskari]

  You can control this a little bit in your WA5 through choice of rectifier, unless you are running 5U4Gs already.  They have about the most voltage drop out of everything that is compatible so there is no room to go down from there.

 
5R4 might beat them.

 

[Xcalibur255]

   
5R4 might beat them.

 
Good call.  It might.  But I think they have marginally higher overall ratings too, so it might be a wash given the less taxing load for the 5R4.

 

[buldogge]

Quick question about some Ken Rad GTs...
 
I just picked up (2) singles...both staggered plates, bottom getter...(1) has taller glass than the other (taller one is marked VT-231).
 
I use these for power tubes in my Little Dots...Any insight on differences beyond the glass envelope height???
 
TIA
-Mark in St. Louis

 

[Mechans1]

  Quick question about some Ken Rad GTs...
 
I just picked up (2) singles...both staggered plates, bottom getter...(1) has taller glass than the other (taller one is marked VT-231).
 
I use these for power tubes in my Little Dots...Any insight on differences beyond the glass envelope height???
 
TIA
-Mark in St. Louis

I am not sure but you will know if there is a significant audible difference.  Please report back to us what your findings are.

 

[Xcalibur255]

  Quick question about some Ken Rad GTs...
 
I just picked up (2) singles...both staggered plates, bottom getter...(1) has taller glass than the other (taller one is marked VT-231).
 
I use these for power tubes in my Little Dots...Any insight on differences beyond the glass envelope height???
 
TIA
-Mark in St. Louis

 
If both plates are staggered they will likely sound the same.  You don't want to mix staggered and non-staggered style because the non are made by GE.

 

[r one]

Hi guys, great time for my easter, i've received my NU 6F8G today, time for listening...enjoy
 
 

 

[r one]

unfortunately, the first tube i've tested today is very noisy : make a ffffffffffffffffffffffffffffffffffffffffffffffffffffffff backgroud sound

What a shame It seems to be so euphonic..grrrrrr