[Jukebox-list] 6sj7 metal or glass difference

[The Jukebox Junkyard]

    The glass pentodes have an internal shield so it makes no difference. 
Wes
----- Original Message ----- 
From: "Ron Rich" <ronnnrich at yahoo.com>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Friday, August 11, 2006 7:06 PM
Subject: Re: [Jukebox-list] 6sj7 metal or glass difference


Rick,
  It is my understanding that it makes no difference in most cases--Someone 
who knows more, please correct this if it's wrong. The metal tube, in most 
cases has the metal connected to ground, thus shielding it from outside 
interference, and also shielding anything on the outside from being inter 
feared with--
  I  usually attempt to go with the markings on the amp, or schematic. If it 
has the number marked 6SJ7/6SJ7G ( or GB) either is usable. If it just says 
6SJ7, I prefer to use a meal tube. Ron Rich



  Rick Force <flashbk13 at hotmail.com> wrote:
  Hi all,
Is there a reason for using a metal vs glass envelope tube? In this case, a 
6sj7 in the ami b amp. I need to replace it (this one is metal) and want to 
buy the correct one. Thank you, Rick.
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