[3083joe]

Try mixing the flat plates with x plates on dual adapter!

 

[mordy]

The whole thing of mixing different power tubes is a different ball game. Cannot figure out what will work well or not, so I am just trying various combinations, using what I have sitting around - trial and error. It could also be that the tube combination is specific to the amp you are using.
 
At the moment I only have dual power adapters and not triple.
 
Using EL3N as drivers: What works well for me are the 6N7 and 6N7G tubes together with the 6BL7.
 
Tried using the 6N7GT tube, which should be the same as the the 6N7 and 6N7G, but it did not pair well.
 
Tried the well regarded 6N23P (6DJ8 family) and the 6H6p - forget it; very bad hum.
 
All the above tubes are together less than 2.5A so present no problems for an amp designed for one pair of 6AS7/6080.
 
The 6BL7 and 6N7 combination  is delicious and certainly suits my frugal nature - paid less $3 each for my 1943/43 6N7 tubes. Even the ECC31 to 6SN7 adapters are available at a low price from Suzier. ($13.16 for a pair incl shipping)
 
 

 

[Badas]

  The whole thing of mixing different power tubes is a different ball game. Cannot figure out what will work well or not, so I am just trying various combinations, using what I have sitting around - trial and error. It could also be that the tube combination is specific to the amp you are using.
 
At the moment I only have dual power adapters and not triple.
 
Using EL3N as drivers: What works well for me are the 6N7 and 6N7G tubes together with the 6BL7.
 
Tried using the 6N7GT tube, which should be the same as the the 6N7 and 6N7G, but it did not pair well.
 
Tried the well regarded 6N23P (6DJ8 family) and the 6H6p - forget it; very bad hum.
 
All the above tubes are together less than 2.5A so present no problems for an amp designed for one pair of 6AS7/6080.
 
The 6BL7 and 6N7 combination  is delicious and certainly suits my frugal nature - paid less $3 each for my 1943/43 6N7 tubes. Even the ECC31 to 6SN7 adapters are available at a low price from Suzier. ($13.16 for a pair incl shipping)
 
 
 

Can just one 6N7 be used in the Woo WA22 power socket?

 

[2359glenn]

 

  The whole thing of mixing different power tubes is a different ball game. Cannot figure out what will work well or not, so I am just trying various combinations, using what I have sitting around - trial and error. It could also be that the tube combination is specific to the amp you are using.
 
At the moment I only have dual power adapters and not triple.
 
Using EL3N as drivers: What works well for me are the 6N7 and 6N7G tubes together with the 6BL7.
 
Tried using the 6N7GT tube, which should be the same as the the 6N7 and 6N7G, but it did not pair well.
 
Tried the well regarded 6N23P (6DJ8 family) and the 6H6p - forget it; very bad hum.
 
All the above tubes are together less than 2.5A so present no problems for an amp designed for one pair of 6AS7/6080.
 
The 6BL7 and 6N7 combination  is delicious and certainly suits my frugal nature - paid less $3 each for my 1943/43 6N7 tubes. Even the ECC31 to 6SN7 adapters are available at a low price from Suzier. ($13.16 for a pair incl shipping)
 
 
 

Can just one 6N7 be used in the Woo WA22 power socket?

Yes

 

[Badas]

 
Yes

Excellent. I will give it a go then. Much difference in gain? Say between a 6AS7G?
I've got plenty of scope. Highest I ever get is 11'Oclock.

 

[Badas]

Are 6N7 nice sounding tubes? Are they similar to 6BL7?

 

[gibosi]

 
Excellent. I will give it a go then. Much difference in gain? Say between a 6AS7G?
I've got plenty of scope. Highest I ever get is 11'Oclock.

 
The 6N7 (6N7 = metal can, 6N7G = glass coke bottle, 6N7GT = straight-sided glass bottle) has an amplification factor of 35. And the heater draws 0.8 amps.
 
The 6BL7GT has an amplification factor of 15.
 
And the 6AS7 has an amplification factor of 2.
 
Also, for comparison, it is 20 for a 6SN7 and 33 for a 6DJ8.

 

[mordy]

As always, YMMV - different amps and different equipment may sound different with the same tube.
 
I did not care too much about the 6N7 as a single tube, but together with the 6BL7 it makes my amp sing. Again, I am using my amp as a preamp and listening through speakers, and not headphones.

 

[Badas]

   
The 6N7 (6N7 = metal can, 6N7G = glass coke bottle, 6N7GT = straight-sided glass bottle) has an amplification factor of 35. And the heater draws 0.8 amps.
 
The 6BL7GT has an amplification factor of 15.
 
And the 6AS7 has an amplification factor of 2.
 
Also, for comparison, it is 20 for a 6SN7 and 33 for a 6DJ8.

 
Excellent info. Thanks.
 
I don't really understand amplification factor. Does that mean the 6N7 at 35 will produce roughly twice the volume of the 6BL7 at 15?

  As always, YMMV - different amps and different equipment may sound different with the same tube.
 
I did not care too much about the 6N7 as a single tube, but together with the 6BL7 it makes my amp sing. Again, I am using my amp as a preamp and listening through speakers, and not headphones.

 
Thanks for the mini review. 6N7 is cheap enough. I might as well give a set a go.

 

[gibosi]

As I understand it, an amplification factor of 35 means that the level of the signal taken off the plate is 35 times the level on the grid. However, the actual "gain" is very dependent on the circuit the tube is used in, and therefore, one cannot simply conclude that rolling these tubes into an amp will increase the output level of the amp 35 times....
 
To provide a little more background on the 6N7...
 
Electrically, the 6N7 can be considered the American equivalent of the ECC31. They have the same pinout and both were designed to operate in push-pull Class B2 circuits. And in fact, during WWII, Mullard labeled ECC31 as 6N7G to be used as replacements in American equipment.
 

 

 

[3083joe]

Yes

Glenn will the EL3N with the adapter work in the wa22?

 

[gibosi]

As a driver? Or as an output tube? I certainly don't know but I suspect that it likely depends on how similar the Elise and WA22 are...
 
The EL3N is a single pentode. So the adapter must convert the pentode into a single triode, and then redirect the pins to allow it to operate in a double triode circuit. This is very similar to how a pair of C3g is used (as drivers) in the Elise...

 

[3083joe]

As a driver? Or as an output tube? I certainly don't know but I suspect that it likely depends on how similar the Elise and WA22 are...

The EL3N is a single pentode. So the adapter must convert the pentode into a single triode, and then redirect the pins to allow it to operate in a double triode circuit. This is very similar to how a pair of C3g is used (as drivers) in the Elise...

Yeah. I feel like someone here has been using them. Or on the woo audio thread.

 

[ru4music]

  As a driver? Or as an output tube? I certainly don't know but I suspect that it likely depends on how similar the Elise and WA22 are...
 
The EL3N is a single pentode. So the adapter must convert the pentode into a single triode, and then redirect the pins to allow it to operate in a double triode circuit. This is very similar to how a pair of C3g is used (as drivers) in the Elise...

Wow!  These kind of configuration changes are scary from a low level engineering/ design stand point.  Make sure the effects of Miller and grid-to-plate (etc.) capacitance changes are considered!  The tubes may work well initially, but, due to "grid leakage" currents etc. (from the design change) tube life and other components can be affected.  Heater current capability does not guarantee an ideal scenario.  YMMV

 

[leftside]

Yeah. I feel like someone here has been using them. Or on the woo audio thread.

I use these Joe on my WA22 with the Mullard ECC31's:
http://www.ebay.ca/itm/201408123468
 
Just remember to use the adapters before using these tubes They are really nice tubes, but I still prefer the ECC32/33/35.