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6l6 pin 1 shield connection

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Posted on May 23, 2017 at 15:05:52
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 I have been using metal body 6l6 with pin 1 of the octal socket open. According to the tube manual pin 1 should be connected to the shield. I have not found any other info about this connection and how to do it. Any help would be appreciated. cheers.

 

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RE: 6l6 pin 1 shield connection, posted on May 23, 2017 at 17:13:37
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
 Pin 1 of metal envelope Octal tubes connects to the metal envelope. Connect pin 1 of the socket to chassis. The metal envelope is the shield!

BTW, quite a few glass envelope Octals that have a metal ring on the base (for instance KT88) connect the ring to pin 1. Unless, like the 6SN7, pin 1 of an Octal is explicitly connected to an active electrode, tying pin 1 of the socket to the chassis is (IMO) a very reasonable action.


Eli D.

 

RE: 6l6 pin 1 shield connection, posted on May 23, 2017 at 19:25:32
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 Thanx Eli. That is what i believed, but, i wanted to be double check. In the case of the EL34 pin 1 is connected to pin 8 so connecting 1 to ground would require a switch or some other way around that, correct? cheers.

 

RE: 6l6 pin 1 shield connection, posted on May 23, 2017 at 19:42:30
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
 Let's look at the EL34 data sheet. Pin 1 is g3 (an active electrode) and normally connects to the cathode (pin 8). My previous remark about active electrodes applies. There is nothing to tie to the chassis in an EL34.


Eli D.

 

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