[gibosi]

Have begun to roll 6A6 today. First up is a tube labeled as a Tung-Sol, but as I have seen RCA's with the same construction, specifically those cross-shaped mica spacers, it could be a rebrand. The 6A6 uses a medium 7-pin U7B base, also referred to as a UX7 base, instead of the more common octal base, so an adapter is necessary. This tube preceded the 6N7 and they are electrically identical. In fact, early 6N7G's appear to be nothing more than 6A6 bottles shoved into an octal base.
 
The 6A6 and 6N7G are very similar to the ECC31, with powerful heaters, a common cathode, and designed to operate as a push-pull Class B2 audio amplifier in radios of the late 1930's, hence my interest in rolling these.
 
It sounds pretty good, but it has been up and running for less than an hour, plus I have my "burn-kit" installed (a pair of mismatched RCA 6AS7's with different construction and a Sylvania 3DG4 regulator) so I can't say anymore at this time.
 

 

[gibosi]

Also, this tube has a foil getter and I notice that the tube type, 6A6, is enclosed in a circle, rather than a hexagon. I assume that it is fairly old. Does anyone know roughly when the circle was replaced by the hexagon?
 

 

[Badas]

^
 
Can this type of tube be used in a 6SN7 circuit?

 

[gibosi]

  ^
Can this type of tube be used in a 6SN7 circuit?

 
It needs an adapter, as the base is different and it is necessary to properly connect the common cathode into the 6SN7 socket. (And I know... this adapter is butt-ugly! lol)
 
The heaters draw only 0.8 amps, so a bit more than the 6SN7, but less than an ECC32.
 
Here is a Sylvania 6A6 in my Glenn OTL.
 

 

[parbaked]

This is for Glenn:

Our Trader Joes has a new item - Greek Cheese Pies!!
I know they're not the real thing but they might help ease the pain until you get the good stuff...

 

[Neogeo333]

  This is for Glenn:

Our Trader Joes has a new item - Greek Cheese Pies!!
I know they're not the real thing but they might help ease the pain until you get the good stuff...

Send a couple to the old grampa he'll bump you up from the queue line.

 

[jc9394]

  Send a couple to the old grampa he'll bump you up from the queue line.

 
 
I may have to do that when I'm ready for the 300b

 

[2359glenn]

  This is for Glenn:

Our Trader Joes has a new item - Greek Cheese Pies!!
I know they're not the real thing but they might help ease the pain until you get the good stuff...

I love Greek cheese pies but Trader Joes is a hour away.
Stavros always has them when I come to visit.

 

[2359glenn]

  ^
 
Can this type of tube be used in a 6SN7 circuit?

Not in the WA22 the tube has a common cathode.
Hum it might work though.
Now that I am thinking about it it will work with a 7pin to 8pin adapter.
Also the 6N7 is the same tube in a 8 pin base but will still need a adapter

 

[MIKELAP]

 

  ^
 
Can this type of tube be used in a 6SN7 circuit?

Not in the WA22 the tube has a common cathode.
Hum it might work though.
Now that I am thinking about it it will work with a 7pin to 8pin adapter.
Also the 6N7 is the same tube in a 8 pin base but will still need a adapter

Using 6N7 ,1635 and ECC 31 in WA22 with adapters                                                                                                                                                                                                                                                                   

 

[Badas]

^
 
Your amp is looking nice.
 
How did you do that paint the logo trick again? I tried with a felt tip pen. Epic fail.

 

[MIKELAP]

  ^
 
Your amp is looking nice.
 
How did you do that paint the logo trick again? I tried with a felt tip pen. Epic fail.

Just fill the letters with paint and wipe off excess 

 

[MIKELAP]

 

  ^
 
Your amp is looking nice.
 
How did you do that paint the logo trick again? I tried with a felt tip pen. Epic fail.

Just fill the letters with paint i used water based paint and wipe off excess 

 

[Badas]

Cool. I will go and find a silver paint.
 
Will model paint be water based?

 

[MIKELAP]

  Cool. I will go and find a silver paint.
 
Will model paint be water based?

You can use oil base paint  if you want ,the trick is wiping across the letters without removing the paint in the letters i used a humid not wet ,paper towel and patience .