filament wiring of dual rectifiers

dobias · 26th April 2011, 06:58 PM

Gentlemen,
I've seen both grounded & ungrounded methods of wiring rectifiers & I need guidance for the best way for the PS I'm building.
I have two 5R4GYA direct heated cathode rectifiers with two 5V 5A filament transformers without center taps.
I plan on tying the filaments & transformers together in series & using the center connection to feed the choke input filter(s).
Is there a need for "transformer phasing", should I wire terminal #1 to #1 or terminal #2 to #1 ?
Is there any need to use the alternate grounded "CT" wiring method?
I hope my question makes sense.
Frank

infinia · 26th April 2011, 07:25 PM

yes phase matters, wrong phase and they buck each other. for positive HV choke connection the cathodes are connected. so that makes sense if you want to combine filaments there. probably connect 2 to 1 to stack voltages, if they are wound identical. Easy to check your own work with a test 12V bulb before connection to HV.

dobias · 27th April 2011, 01:16 AM

Infinia,
Thank you for responding.
I must be having a senior moment, I know that there would be 10vac on the outside connections when #2 is tied to the other's #1, but what would there be if I (incorrectly) tied #1 to the other's #1 ?
Just to confirm: I would not series wire the filaments to use the 10vac. Each filament would have it's own 5vac transformer, and there is no connection to ground.

infinia · 02:35 AM

I have a feeling you are not asking the question you want to know. what are you trying to achieve?,
when they are in phase they are bucking from # 2 to #2 since there is a common connection at center the #1s, each filament is free to run its own separate current. ie 2 circuits with one common connection at the #1s. The cathodes are common at #1 which in turn becomes the source of HV +dc which is then feed to a DC smoothing choke,.
BTW I suppose you could reverse everything and feed the DC choke to ground too. I suggest you draw what Im saying to help us/you comprehend.

dobias · 28th April 2011, 02:15 PM

Infinia,
I'm finding I'm in way over my head with this discussion.
I'll have to be satisfied with your directions as to the correct wiring of the filaments to individual trafos & the center tap to the choke input filter.
"The devil is in the details" is very true.
Thanks,
Frank

27th April 2011, 02:31 AM	#4
infinia diyAudio Member Join Date: May 2005 Location: Californication	I have a feeling you are not asking the question you want to know. what are you trying to achieve?, when they are in phase they are bucking from # 2 to #2 since there is a common connection at center the #1s, each filament is free to run its own separate current. ie 2 circuits with one common connection at the #1s. The cathodes are common at #1 which in turn becomes the source of HV +dc which is then feed to a DC smoothing choke,. BTW I suppose you could reverse everything and feed the DC choke to ground too. I suggest you draw what Im saying to help us/you comprehend. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust Last edited by infinia; 27th April 2011 at 02:35 AM.

28th April 2011, 02:15 PM	#5
dobias diyAudio Member Join Date: Jun 2007	Directions Infinia, I'm finding I'm in way over my head with this discussion. I'll have to be satisfied with your directions as to the correct wiring of the filaments to individual trafos & the center tap to the choke input filter. "The devil is in the details" is very true. Thanks, Frank

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26th April 2011, 06:58 PM	#1
dobias diyAudio Member Join Date: Jun 2007	filament wiring of dual rectifiers Gentlemen, I've seen both grounded & ungrounded methods of wiring rectifiers & I need guidance for the best way for the PS I'm building. I have two 5R4GYA direct heated cathode rectifiers with two 5V 5A filament transformers without center taps. I plan on tying the filaments & transformers together in series & using the center connection to feed the choke input filter(s). Is there a need for "transformer phasing", should I wire terminal #1 to #1 or terminal #2 to #1 ? Is there any need to use the alternate grounded "CT" wiring method? I hope my question makes sense. Frank

26th April 2011, 07:25 PM	#2
infinia diyAudio Member Join Date: May 2005 Location: Californication	yes phase matters, wrong phase and they buck each other. for positive HV choke connection the cathodes are connected. so that makes sense if you want to combine filaments there. probably connect 2 to 1 to stack voltages, if they are wound identical. Easy to check your own work with a test 12V bulb before connection to HV. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

27th April 2011, 01:16 AM	#3
dobias diyAudio Member Join Date: Jun 2007	Infinia, Thank you for responding. I must be having a senior moment, I know that there would be 10vac on the outside connections when #2 is tied to the other's #1, but what would there be if I (incorrectly) tied #1 to the other's #1 ? Just to confirm: I would not series wire the filaments to use the 10vac. Each filament would have it's own 5vac transformer, and there is no connection to ground.

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