[Silent One]

Thanks. This neatly fits in with my earlier comment - post 2128. 

 

[rosgr63]

Research and development never stopped.

 

[Silent One]

Looking forward to returning my attention to the FIVRE's later this week. Finally got around to WAR this past weekend. 

 Better late than never.

 

[rosgr63]

Cisco Kid, Me and Baby Brother, Galaxy, Cinco De Mayo, The World is a Ghetto, Low Rider, Tobacco Road, Outlaw, Spill the Wine, Hey Señorita, Southern Part of Texas, Get Down to name a few.
 
Actually I am listening to these tracks as we speak.
 
Driver is a FIVRE 6CG7 driving a pair of NU 6F8G's.
Sounds good.

 

[Skylab]

Some of my oval mica TS BGRP have steel rods, and some have copper rods. Not sure I have ever really thought much about if there is any sonic difference that can be attributed to that either.

 

[Xcalibur255]

The difference jumped out at me.  I wasn't even looking for one, I just observed mismatched tone in a pair of tubes I had and began to examine the tube more closely to see if there were any physical differences and the posts was the only one.  Given it will have different heating and conducting properties from steel it stands to reason it will affect some things.  In every comparison I've made steel posts have a leaner sound that is a bit hotter in the upper mids and copper posts have a slightly richer warmer sound with a bit more mid bloom.  I universally prefer the copper in tubes where I have both, the harmonics just seem more real and fleshed out in those tubes.

 

[john57]

Xcalibur255
You may be right I have the 12SN7 TS BGRP and it uses steel posts and I judge them to be just a bit on the lean side.

 

[dminches]

Quote:

The difference jumped out at me.  I wasn't even looking for one, I just observed mismatched tone in a pair of tubes I had and began to examine the tube more closely to see if there were any physical differences and the posts was the only one. 

 
What were you listening to when you made this discovery?  I don't think I would notice that especially with a stereo recording.

 

[Silent One]

My pair is sitting on Copper. 

 Well, you know what I mean...

 

[Silent One]

Quote:

 
What were you listening to when you made this discovery?  I don't think I would notice that especially with a stereo recording.

 I'd like to know as well.

 

[Silent One]

Quote:

The difference jumped out at me.  I wasn't even looking for one, I just observed mismatched tone in a pair of tubes I had and began to examine the tube more closely to see if there were any physical differences and the posts was the only one.  Given it will have different heating and conducting properties from steel it stands to reason it will affect some things.  In every comparison I've made steel posts have a leaner sound that is a bit hotter in the upper mids and copper posts have a slightly richer warmer sound with a bit more mid bloom.  I universally prefer the copper in tubes where I have both, the harmonics just seem more real and fleshed out in those tubes.

 
 

 You're good!

 

[CEE TEE]

I've got a bad Oval Mica.  I could send it to you to open up.
Quote:

I was told by one of my tube suppliers.
One might have to destroy one of each different mica tubes to find out.
I could never do that, so I cannot confirm whether it's true or not.
 
However if somebody has two dead tubes with the different micas then we can find out, I'll let them know what to look for!

 

[Xcalibur255]

Quote:

 
What were you listening to when you made this discovery?  I don't think I would notice that especially with a stereo recording.

You mean what music?  I don't recall exactly.  It was just a feeling that creeped up on me over time while listening.  I could not shake the feeling that tonal balance was different on the right channel vs. the left so I swapped the tubes and differences in tone followed.  I initially thought it to be electrical mismatching or something with that particular pair of tubes, but after some investigating I discovered several other pairs of tubes I owned that had mismatched grid posts in the same way and all of them exhibited the same tonal imbalance.  On pairs with matching posts the tone always felt the same on each channel, or in other words it sounded right and nothing was amiss.
 
This was one of the first things I learned to check for when buying tubes in pairs, but by that time I had already bought quite a bit of my collection anyway.

 

[Skylab]

I wouldn't go opening tubes. Unless you enjoy Mercury poisoning.

 

[Xcalibur255]

Well, now my other BGRP Tung Sol, the one that was good, is howling in the amp.  *sigh*
 
I would wonder if it was the amp, but I've had somewhere around 15 other 6SN7 tubes in this socket and all of them were dead quiet.  But both of my absurdly expensive Tung Sols have noise problems up the wazoo.
 
Maybe this is part of the reason why I like Sylvania tubes so much.