help with power transformer...overheating?, crackling noise
11/13/2002 8:55:24 PMsean nelson(18865:0)
hello everyone
I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
11/13/2002 10:15:18 PMLarry Steeno(18866:18865)
:hello everyone
:I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
This is timeconsuming but it is a step by step elimination process. Good luck
11/13/2002 10:15:32 PMLarry Steeno(18867:18865)
:hello everyone
:I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
This is timeconsuming but it is a step by step elimination process. Good luck
11/13/2002 11:00:44 PMsean nelson(18870:18867)
:I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
:
::hello everyone
::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
:
:The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
:This is timeconsuming but it is a step by step elimination process. Good luck
11/13/2002 11:37:31 PMsean nelson(18871:18870)
:If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
:
::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
::
:::hello everyone
:::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
::
::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 8:22:04 AMNorm Leal(18872:18871)
Hi Sean
Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
Norm
::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
::
:::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
:::
::::hello everyone
::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
:::
:::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
:::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 9:17:40 AMPoston Drake(18873:18872)
Hi Sean,
From the symptoms you describe and your voltage reading, your transformer is probably shorted. If you want to make sure, remove all the tubes from your radio and plug it into a series light bulb tester with about a 25 watt bulb. With a good transformer and no problems in the radio, the bulb should just barely glow. If a short is present the bulb will light much brighter. If the bulb lights up bright, then disconnect the secondary windings of your transformer one by one from the radio and check again. If at any point the bulb drops back to a very dim glow, you have found a short in a radio circuit, and not the transformer. But if the bulb continues to light brightly after all secondary leads are disconnected, then you can assume the short is in the transformer itself and it must be replaced.
Size a replacement transformer using the procedure Norm has described. The replacement should be of similar physical size and mounting.
Poston
:Hi Sean
:
: Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
:
: Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
:
: For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
:
:Norm
:
:::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
:::
::::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
::::
:::::hello everyone
:::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
::::
::::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
::::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 9:18:01 AMPoston Drake(18874:18872)
Hi Sean,
From the symptoms you describe and your voltage reading, your transformer is probably shorted. If you want to make sure, remove all the tubes from your radio and plug it into a series light bulb tester with about a 25 watt bulb. With a good transformer and no problems in the radio, the bulb should just barely glow. If a short is present the bulb will light much brighter. If the bulb lights up bright, then disconnect the secondary windings of your transformer one by one from the radio and check again. If at any point the bulb drops back to a very dim glow, you have found a short in a radio circuit, and not the transformer. But if the bulb continues to light brightly after all secondary leads are disconnected, then you can assume the short is in the transformer itself and it must be replaced.
Size a replacement transformer using the procedure Norm has described. The replacement should be of similar physical size and mounting.
Poston
:Hi Sean
:
: Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
:
: Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
:
: For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
:
:Norm
:
:::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
:::
::::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
::::
:::::hello everyone
:::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
::::
::::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
::::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 4:13:58 PMsean nelson(18878:18874)
::The tube manual shows 325v for the 1v tube, 315v for the 41 tube , 250v for the 6d6, 250v for the 6a7. So do you go by the max volts....325 and get one around that?
::
:Hi Sean,
:From the symptoms you describe and your voltage reading, your transformer is probably shorted. If you want to make sure, remove all the tubes from your radio and plug it into a series light bulb tester with about a 25 watt bulb. With a good transformer and no problems in the radio, the bulb should just barely glow. If a short is present the bulb will light much brighter. If the bulb lights up bright, then disconnect the secondary windings of your transformer one by one from the radio and check again. If at any point the bulb drops back to a very dim glow, you have found a short in a radio circuit, and not the transformer. But if the bulb continues to light brightly after all secondary leads are disconnected, then you can assume the short is in the transformer itself and it must be replaced.
:
:Size a replacement transformer using the procedure Norm has described. The replacement should be of similar physical size and mounting.
:
:Poston
:
:
::Hi Sean
::
:: Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
::
:: Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
::
:: For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
::
::Norm
::
::::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
::::
:::::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
:::::
::::::hello everyone
::::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
:::::
:::::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
:::::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 9:18:11 AMPoston Drake(18875:18872)
Hi Sean,
From the symptoms you describe and your voltage reading, your transformer is probably shorted. If you want to make sure, remove all the tubes from your radio and plug it into a series light bulb tester with about a 25 watt bulb. With a good transformer and no problems in the radio, the bulb should just barely glow. If a short is present the bulb will light much brighter. If the bulb lights up bright, then disconnect the secondary windings of your transformer one by one from the radio and check again. If at any point the bulb drops back to a very dim glow, you have found a short in a radio circuit, and not the transformer. But if the bulb continues to light brightly after all secondary leads are disconnected, then you can assume the short is in the transformer itself and it must be replaced.
Size a replacement transformer using the procedure Norm has described. The replacement should be of similar physical size and mounting.
Poston
:Hi Sean
:
: Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
:
: Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
:
: For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
:
:Norm
:
:::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
:::
::::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
::::
:::::hello everyone
:::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
::::
::::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
::::This is timeconsuming but it is a step by step elimination process. Good luck
11/14/2002 4:22:41 PMSean Nelson(18879:18875)
:The transformer has no center tap, tube is a 1v. It has a 6.3 volt for the paralell filaments...1.6 amps required for the filament amperage in tube manual total
:
:Hi Sean,
:From the symptoms you describe and your voltage reading, your transformer is probably shorted. If you want to make sure, remove all the tubes from your radio and plug it into a series light bulb tester with about a 25 watt bulb. With a good transformer and no problems in the radio, the bulb should just barely glow. If a short is present the bulb will light much brighter. If the bulb lights up bright, then disconnect the secondary windings of your transformer one by one from the radio and check again. If at any point the bulb drops back to a very dim glow, you have found a short in a radio circuit, and not the transformer. But if the bulb continues to light brightly after all secondary leads are disconnected, then you can assume the short is in the transformer itself and it must be replaced.
:
:Size a replacement transformer using the procedure Norm has described. The replacement should be of similar physical size and mounting.
:
:Poston
:
:
::Hi Sean
::
:: Once a transformer crackles it's usually too late to save. Determine voltages by a schematic. If not shown a tube manual gives an idea what's needed.
::
:: Usually turns of the high voltage secondary short. Can't always go by voltage read on a meter as the short causes loading. I would expect your secondary to be closer to 300 volts each side of center. Exact voltage isn't critical.
::
:: For filaments add up current drawn by tubes and lamps. Use a tube manual to find this information.
::
::Norm
::
::::If this transformer is shorting out internally on the primary side then the 215 volts I am measuring on the secondary side probably is low? How would you pick a power transformer if it was totally open?
::::
:::::I have removed all the tubes and the transformer still crackles and heats up. So I guess its replacement time? Never done that. I measured the voltage. It seems to be 6.3 for the filaments and about 215 for the B+. These filaments are parallel so I would guess a 2 amp filament trans would work? Not sure what to look for as far as B+ winding
:::::
::::::hello everyone
::::::I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem
:::::
:::::The first thing to do is remove all tubes and see if this stopps the heating of the transformer. Then if it is not hot or crackling replace all tubes one at a time with the rectifier last and power up after each tube is replaced. If you have a tube problem this will let you know that. If the transformer still heats up with all tubes out then disconnect the wires fromthe transformer to components (make notes to be sure you can re-connect). With all transformer wires removed and it still heats up then the transformer has an internal short and must be replaced or rewound.
:::::This is timeconsuming but it is a step by step elimination process. Good luck
11/25/2002 2:21:57 AMGary(19074:18865)
Hi: I can rewind the transformer for you. $95.00 plus shipping.
Regards, Gary
:I am working on my detrola 106, and the power transformer is or seems to be hot and making a crackling noise that you can hear when you turn the volume down enough to hear the noise. At least I think its the power trans. Thought about checking amperage set is drawing, but not sure about how to do that. Do these transformers make this noise when they are failing themselves or is something else causing this? I have replaced the filter caps, because I thought that was what was making the noise(I put my ear on one of the caps and the noise seemed to be coming from there...I guess not now), noise still there. I cannot keep my finger on the side of the trans for very long..too hot. So I guess I need ideas on how to solve my baking transformer problem