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Old 18th December 2012, 05:57 PM   #1
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Question AC heaters question

I would like to know which pin have I to connect the 0V and wich one for the 6.3V, I ask because I need to know for tube rectifiers AZ1, 6AX4GT, etc.? or isn't necessary specific pin?
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Old 18th December 2012, 06:07 PM   #2
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Hi Felipe,

With rectifiers, connect between heater-winding and heater in either way (there is no polarity).

If the rectifier is directly-heated (5U4, 5R4GY etc) the rectifier filament-winding (transformer secondary) must not be shared with other heaters. And this winding must have strong insulation from other secondary windings on the same transformer.
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Old 18th December 2012, 06:10 PM   #3
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Thanks Rod, I supposed VAC can't need polarity, but as good newbie I wanna be sure, at this moment only want to use AZ1 & 6AX4GT, both aren't directly-heated right?
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Old 18th December 2012, 06:21 PM   #4
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Keep in mind that even a significant number of indirectly heated rectifiers have an internal connection between the heater and the cathode, as in the GZ34/5AR4.

In this case, Rod's answer also applies to indirectly heated rectifiers.

Greetings,
Andreas
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Old 18th December 2012, 06:54 PM   #5
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Many thanks for advices.
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Old 18th December 2012, 06:55 PM   #6
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Felipe, AZ1 is directly heated. Please use separate winding!
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Old 18th December 2012, 06:58 PM   #7
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Thanks to clarify Rod, I will use separate transformer for AZ1 & 6AX4GT.
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Old 19th December 2012, 09:45 AM   #8
mvd is offline mvd  Germany
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Hello Felipe

Please have a look at the following Link to the Radiomuseum, because of the AZ1 is not only direct heated, but needs also the old filament-voltage of 4V.

AZ 1, Tube AZ1; Röhre AZ 1 ID198, Full-Wave Vacuum Rectifier

Best regards
Michael
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Old 19th December 2012, 10:00 AM   #9
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Hello Michael

Thanks, I know because I downloaded the datasheet from Duncan Amps also Rod told me.

Have a nice day.
Felipe
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