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Old 20th March 2004, 07:36 AM   #1
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Default 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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Old 20th March 2004, 02:24 PM   #2
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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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Old 21st March 2004, 08:58 PM   #3
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Thank you so much...

MB
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