[toddc2]

Thanks to the generosity of a local tube dealer, I was able to listen to about 10 different pairs of 6SN7's in my house today. Of the 10 pairs, three pairs were quiet enough to live with and I purchased all 3:

1) RCA black plates with D side getters
2) Sylvania GTB's labeled Rogers
3) Newer production Japanese tubes labeled RTT

I really liked the RCA's so I left them installed for now.

I was also able to briefly test a Mullard fat base rectifier in place of my 66 Blackburn GZ34. I honestly couldn't hear a difference so I stuck with my tube.

All in all, a very good day!

[jhrlrd]

Did you tap on the tube or chassis to check microphonics in each? In what way was the RCA black plates your favorite?
thanks

[paul79]

Thanks to the generosity of a local tube dealer, I was able to listen to about 10 different pairs of 6SN7's in my house today. Of the 10 pairs, three pairs were quiet enough to live with and I purchased all 3:

1) RCA black plates with D side getters
2) Sylvania GTB's labeled Rogers
3) Newer production Japanese tubes labeled RTT

I really liked the RCA's so I left them installed for now.

I was also able to briefly test a Mullard fat base rectifier in place of my 66 Blackburn GZ34. I honestly couldn't hear a difference so I stuck with my tube.

All in all, a very good day!

ALL of the old Mullard GZ34's are great. I wouldn't get hung up on the Metal, fat, this or that.... They are all equally excellent to my ears.

[toddc2]

Did you tap on the tube or chassis to check microphonics in each? In what way was the RCA black plates your favorite?
thanks

I tapped on the chassis, something about tapping on tubes with the top off scares me. I'm an electrical engineer, fear (or respect) of electricity never factored into my educational choices for some reason. 

I liked the warmth of the RCA mid-range. The bass is a little weak and the top end doesn't sparkle, but overall the sound is close to what I am looking for. After living with these for a week or so, I am picking up on some upper-mid range distortion that I didn't notice before. It's not bad, but knowing it's there makes it stand out more when it does pop up.

I am not done yet but I can live with these tubes for now.

Todd

[jimbones]

Ok so I got some Brimar 6SN7's Man do they sound good. They offer the best balance of warmth with good hi end extension. A little light on the bass though

[Meechy]

Hi guys. I purchased a pair of Northern Electric 6sn7 tubes and a Sovtek 5ar4 rectifier combination for the LS 100 and I'll just say what a great sound I'm hearing. Wonderful soundstage good spread not very bright top end almost a lush mid and a very strong bottom end. These tubes are very quite no noise at all. The Northern Tubes are good looking with a gold base and pins. If your looking for strong bass these might be the ones for you. Just thought I would add to this topic. Thanks.

[Ictwoody]

Hi guys. I purchased a pair of Northern Electric 6sn7 tubes and a Sovtek 5ar4 rectifier combination for the LS 100 and I'll just say what a great sound I'm hearing. Wonderful soundstage good spread not very bright top end almost a lush mid and a very strong bottom end. These tubes are very quite no noise at all. The Northern Tubes are good looking with a gold base and pins. If your looking for strong bass these might be the ones for you. Just thought I would add to this topic. Thanks.

I'm kinda confused. Which doesn't take much. Are the Northeren Electric from TTS and Sofia Electric 6SN7's the same tubes? Or they actually different tubes?

- Woody

[Meechy]

Hey Woody. The Northerns are a Shugang tube I was told. Chinese tube. The guy from the Tubestore. com told me. They are a bit expensive but I got a nice sound from them. Still using them in my Modwright pre amp.                     Not sure about the Sophia tubes. Thanks. Meechy

[Ictwoody]

So what can be expected when going from the Sovtek rectifier to an NOS Mullard Blackburn GZ34? I have a Mullard BB en route to me soon and I was wondering what to expect?

- Woody

[Meechy]

I have not listened to a Mullard tube so I can't give you an answer. Some people think that rectifier tubes don't make much of a difference in sound quality. I think there is but I have not heard a Mullard sorry.

[Ictwoody]

I have not listened to a Mullard tube so I can't give you an answer. Some people think that rectifier tubes don't make much of a difference in sound quality. I think there is but I have not heard a Mullard sorry.

Thanks. I guess I'll find out soon enough.

ALL of the old Mullard GZ34's are great. I wouldn't get hung up on the Metal, fat, this or that.... They are all equally excellent to my ears.

Curious if @Paul79 would want to expound on this.

- Woody