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20th March 2004, 07:36 AM
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#1 |
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diyAudio Member
Join Date: Feb 2004
Location: Istanbul/TURKEY
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cathode connection in directly heated triodes
Hi,
Cathode circuit is connected to the point half in between the heater pins of directly heated triodes (such as 300B). I think this is to eliminate hum by connecting +Vh/2 to one and -Vh/2 to the other pin. Is it right ? Is such a connection necessary if triode is heated with a DC supply ? will simply connecting the Vh (+) supply to one and cathode circuit to other pin of triode work ? Thanks in advance. MB |
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20th March 2004, 02:24 PM
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#2 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
 
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Right on both counts. In fact tube data is traced with DC heaters and ground connected to a specific pin. I forget which though.
Tim
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