[Jukebox-list] 6sj7 metal or glass difference

[Jay Hennigan]

Wesley Dean wrote:
>    Rick, these AMI amplifiers originally had copy on it stating that the 
> AC line cord should not be laid close to the tubes. Even though the 
> glass ones have internal shielding, in this case, the metal ones would 
> be better if the line cord is not rerouted. Wes

This may have been to keep the line cord from melting or falling apart 
and not for shielding purposes.  Not that it would have helped much 
judging from the condition of almost all AMI AC cords.

Pin 1 of a 6SJ7 (metal) is connected to the case, on a 6SJ7GT it is 
connected to an internal shield.  It shouldn't make any difference.

For what it's worth, metal 6SJ7s seem to be far more plentiful on the 
surplus market.

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