[Silent One]

12AX7 perhaps?

 

[Oskari]

Quote:

I always leave a clue!
 
Oskari, I removed the clue for now until I have the adapters and try it for myself first.

 
Ooh, mysterious!  

 

[grokit]

 

[liamstrain]

Looks taller ... 6CG7 or ECL82?

 

[dminches]

Quote:

Looks taller ... 6CG7 or ECL82?

 
I think you got it with the 6CG7.  If so, it is funny since I went the other way in my AVA Hybrid DAC which takes 6CG7.  With adapters I am using 6SN7s.

 

[Skylab]

I know, but I am not allowed to say

 

[rosgr63]

Thanks Rob, we are not ready yet.
 
Oskari please don't say anything yet, I am sure you know.
 
SO Liam and David they are not 12AX7 or 6CG7 type tubes, we have covered those a few months ago in this thread.

 

[Neogeo333]

12bh7 perhaps?

 

[rosgr63]

Quote:

12bh7 perhaps?

 
Good guess.
One more clue they are directly equivalent, they have a 6.3 heater voltage.

 

[Xcalibur255]

I found a couple of families of tubes that looked close in my search for datasheets, but if you say it is an exact replacement then the amplification factor and plate voltage would have to be the same and these were slightly different.  So I'll have to wait for the reveal to be in the know.

 

[Neogeo333]

The only tube close enough in my stash that look like a 12bh7 is a e80cc by Siemens.

 

[cacatalysis]

My question is simple, could anybody educate me about the mullard ECC33 in the picture, what is the significance for the military code with arrow.

 

[kchew]

"CV" stands for "Common Valve", while the arrow is a government mark. http://www.tubecollector.org/cv-valves.htm
 
Those ECC33s look sweet. I have a pair with black base, and in my WA22 they sound very similar to the ECC32 in a smaller package.

 

[rosgr63]

Quote:

I found a couple of families of tubes that looked close in my search for datasheets, but if you say it is an exact replacement then the amplification factor and plate voltage would have to be the same and these were slightly different.  So I'll have to wait for the reveal to be in the know.

 
In the loose sense of the word, I mean they don't need any diodes or resistors in the base.
Sorry if I've been misleading you.

 

[Blackmore]

I love my, but make sure your amp can take them, cos they are not direct 6SN7 replacements. They are smooth ( not dull ), midrange focused with great extention, very good tubes.
 

 
 
 
 
 
Quote:

My question is simple, could anybody educate me about the mullard ECC33 in the picture, what is the significance for the military code with arrow.