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Old 25th October 2006, 06:44 PM   #1
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Default DH rectifier hookup.

Easy question for you all and I just want to make sure this is how it's done.

When using a DH rectifier like a 5Y3GT, the power trannies secondary leads go to pins 4 and 6 with the PT's center tap grounded? Then the 5V filament leads go to pins 2 and 8, with the B+ connection to the first filter cap coming off of pin 8 or the B+ connection coming from the center tap of the 5V winding if it has a center tap (with the two main heater leads still at pin 2 and 8)?
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Old 25th October 2006, 06:51 PM   #2
dhaen is offline dhaen  Europe
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Hi,

The +B can come off either pin 8, pin 2 but if the heater winding has a centre tap then use that.
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Old 25th October 2006, 06:58 PM   #3
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Yep. That's the way I was understanding it.

Thanks!
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Old 25th October 2006, 08:12 PM   #4
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If there is no CT (and even if there is) I use pin 8 as the B+ connection. That allows me to plug in a 5AR4 if I so desire.
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Old 25th October 2006, 08:19 PM   #5
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Quote:
Originally posted by tubelab.com
If there is no CT (and even if there is) I use pin 8 as the B+ connection. That allows me to plug in a 5AR4 if I so desire.
If there is a CT and you use pin 8 for B+, what do you do with the CT?
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Old 25th October 2006, 08:52 PM   #6
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Tape or sleeve it and forget about it.
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Old 25th October 2006, 08:54 PM   #7
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I don't connect the CT to anything.

Using the CT on a DH rectifier will give you 2.5 volts less ripple (hum). Using the CT on a 5AR4 will give you 2.5 volts MORE ripple, and the DC output current will flow through half of the filament winding on the power transformer. So it really comes down to which tube you want to use more often. Either way will work.

Using pin 2 as the DC output on a 5AR4 will give you 5 volts more ripple and is not recommended (all of the DC output current flows through the filament winding on the transformer).
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Old 26th October 2006, 05:05 AM   #8
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Thanks everyone.

Every little bit adds to my germ-sized collective knowledge.
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