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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Transformer DC resistance value estimate needed
Can anyone give me a ballpark on the DCR of this particular
small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ http://www.duncanamps.com/psud2/ |
#2
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Transformer DC resistance value estimate needed
On 3/31/19 4:13 PM, bitrex wrote:
Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ http://www.duncanamps.com/psud2/ You can ask Hammond directly. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
#3
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Transformer DC resistance value estimate needed
bitrex wrote:
Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ ** Assuming the tranny has a regulation factor of 10%, that equates to 6 volts copper loss on the primary under full load. Rated load is 36 VA plus a little for Imag gives 40VA. So the primary current with resistive load is 0.33amps rms. Makes the primary R = 18ohms. A similar, 240V tranny would have four times the primary R. ...... Phil |
#4
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Transformer DC resistance value estimate needed
On 2019/03/31 4:14 p.m., Fox's Mercantile wrote:
On 3/31/19 4:13 PM, bitrex wrote: Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ http://www.duncanamps.com/psud2/ You can ask Hammond directly. Mouser has an ECAD model info on that transformer - but no stock: https://www.mouser.ca/ProductDetail/...mozu4alfnsEA== Here is the Hammond classic xformer page: https://www.hammfg.com/electronics/t...rs/classic/200 Looks like 269JX is close to the 6K88VG. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#5
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Transformer DC resistance value estimate needed
On 3/31/19 8:22 PM, Phil Allison wrote:
bitrex wrote: Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ ** Assuming the tranny has a regulation factor of 10%, that equates to 6 volts copper loss on the primary under full load. Rated load is 36 VA plus a little for Imag gives 40VA. So the primary current with resistive load is 0.33amps rms. Makes the primary R = 18ohms. A similar, 240V tranny would have four times the primary R. ..... Phil Great, thank you, seems to be in congruence with the similar Hammond-branded specs on the 269JX JD referred above, rated for 60mA output with around 11 ohms primary DCR and 350 ohms on the secondary. https://www.hammfg.com/files/parts/pdf/269JX.pdf A pretty nice piece for the price I think particularly given that I should be able pick up several in person at the warehouse and avoid shipping. Only question I'm unsure of now is what format the program expects the transformer "source resistance" parameter in; whether it's the end-to-end secondary DCR plus the primary DCR referred to the secondary directly, or whether that needs to take into account in a full-wave center-tapped configuration that the load is only "seeing" half the secondary impedance at a time, unfortunately the included Help manual is not helpful here. |
#6
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Transformer DC resistance value estimate needed
On 4/1/19 11:42 PM, bitrex wrote:
On 3/31/19 8:22 PM, Phil Allison wrote: Â* bitrex wrote: Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ ** Assuming the tranny has a regulation factor of 10%, that equates to 6 volts copper loss on the primary under full load. Rated load is 36 VA plus a little for Imag gives 40VA. So the primary current with resistive load is 0.33amps rms. Makes the primary R = 18ohms. A similar, 240V tranny would have four times the primary R. .....Â* Phil Great, thank you, seems to be in congruence with the similar Hammond-branded specs on the 269JX JD referred above, rated for 60mA output with around 11 ohms primary DCR and 350 ohms on the secondary. https://www.hammfg.com/files/parts/pdf/269JX.pdf A pretty nice piece for the price I think particularly given that I should be able pick up several in person at the warehouse and avoid shipping. Only question I'm unsure of now is what format the program expects the transformer "source resistance" parameter in; whether it's the end-to-end secondary DCR plus the primary DCR referred to the secondary directly, or whether that needs to take into account in a full-wave center-tapped configuration that the load is only "seeing" half the secondary impedance at a time, unfortunately the included Help manual is not helpful here. I suppose this is technically a design issue but sci.electronics.design makes fun of tubes. they think they're too GOOD for tubes. |
#7
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Transformer DC resistance value estimate needed
Me, I would measure it with an ohmmeter (= copper resistance) and then
shrtocut the secondary and apply the adequate voltage at the primary so that the secondary current is OK and measure the primary current (= the iron resistance). This give copper loss and iron loss. bitrex a écrit le 31/03/2019 Ã* 23:13Â*: Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ http://www.duncanamps.com/psud2/ |
#8
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Transformer DC resistance value estimate needed
On Monday, April 1, 2019 at 2:57:18 AM UTC-4, John Robertson wrote:
On 2019/03/31 4:14 p.m., Fox's Mercantile wrote: On 3/31/19 4:13 PM, bitrex wrote: Can anyone give me a ballpark on the DCR of this particular small tube-PSU-type transformer to plug into PSU Designer II? https://www.alliedelec.com/product/hammond-manufacturing/6k88vg/70009014/ http://www.duncanamps.com/psud2/ You can ask Hammond directly. Mouser has an ECAD model info on that transformer - but no stock: https://www.mouser.ca/ProductDetail/...mozu4alfnsEA== Mouser Sponsors Formula E All-Electric Racing for 5th Year -- https://finance.yahoo.com/news/mouse...202000399.html Feb 5, 2019 - Mouser Electronics, T |
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