[gibosi]

  I just received a couple more 5998 tubes today and I am listening to them now....one of them has a round getter toward the bottom of the tube on the right side...I have 4 5998 tubes and this is the only one with a getter like this......is it pretty normal.

 
This construction, two halo getters, one on top and one on the side, is quite common in 5998 manufactured in the late 1960's. For example. I have such a pair, one dated 6821 (1968 week 21) and the other, 6934 (1969 week 34).

 

[gibosi]

  Thanks, Glenn.
Yay! More tubes to roll. Eek! More tubes to roll!
 

 
It is my understanding that the 6336B is the one to get, rather than the earlier 6336 and 6336A.

 

[2359glenn]

 

  Thanks, Glenn.
Yay! More tubes to roll. Eek! More tubes to roll!
 

 
It is my understanding that the 6336B is the one to get, rather than the earlier 6336 and 6336A.

Yes the A should be OK too

 

[punit]

I use Tungsol Chatham 6336, works quite well with TH 900. The already good soundstage becomes even more expansive. Can't believe this is a closed HP.
 

 

 

 

[whirlwind]

 

  I just received a couple more 5998 tubes today and I am listening to them now....one of them has a round getter toward the bottom of the tube on the right side...I have 4 5998 tubes and this is the only one with a getter like this......is it pretty normal.

 
This construction, two halo getters, one on top and one on the side, is quite common in 5998 manufactured in the late 1960's. For example. I have such a pair, one dated 6821 (1968 week 21) and the other, 6934 (1969 week 34).

Thank Ken, this is the first 5998 tube that I own that has this getter on the side....mine is a 1966.
 
I love the sound from the 5998 tubes.
 

  I use Tungsol Chatham 6336, works quite well with TH 900. The already good soundstage becomes even more expansive. Can't believe this is a closed HP.
 

 

 

punit....those 6336 tubes do not have the graphite plates, correct ?

 

[Ultrainferno]

 
Thanks, Glenn.
Yay! More tubes to roll. Eek! More tubes to roll!
 
I still use the D7000s too. That's such a great headphone.

 
 
C, if you can wait till april, I'll bring you a pair of these
 

 

 

 
 
 

   
punit....those 6336 tubes do not have the graphite plates, correct ?

 
They certainly do, check above.

 

[Ultrainferno]

BTW, If there's enough interest in these tubes, I'm willing to do another group buy. But not under 10 tubes.

 

[punit]

 
punit....those 6336 tubes do not have the graphite plates, correct ?

 
 

 
 
They certainly do, check above.

Mine  have diff construction
 

 

 

[Ultrainferno]

Glenn and others to the rescue!
Which of these tubes do we want?

 

[punit]

Think both should work just fine. These must be like 6080 tubes - slotted vs solid plates. Please correct me if wrong.

 

[dminches]

I have an NOS pair of Tung-Sol 6336Bs if someone is interested.  $100 shipped to CONUS.
 

 
And an NOS pair of Centron 6336As if someone is interested.  $125 shipped to CONUS.
 

 

[Groundzero]

Which setting for the switch on the back to use 6336? 6AS7 or 5998?

 

[Clayton SF]

C, if you can wait till april, I'll bring you a pair of these
They certainly do, check above.

 
YES! I can wait till April. Your tubes look solid. Nice. And Thanks!

 

[Xcalibur255]

  Which setting for the switch on the back to use 6336? 6AS7 or 5998?

 
I would run the 5998 setting.  The 6336 can take a lot more plate current than either a 6AS7 or 5998 can. 
 
The ideal biasing might be even higher than what the 5998 switch mode is providing.
 
Come to think I wonder why we haven't explored that yet?  It stands to reason neither bias setting puts the 6336 on the ideal part of its curve.......... there might be hidden SQ potential in this tube just like we unlocked from the 5998 a few years ago.

 

[dminches]

Hi Tyrell. Good to "see" you!