Thanks for your help!
Jean-Francois
Since you have two windings could this be an output transformer? You can buy replacement output transformers. Neither the field choke or output transformer are critical. Plus or minus 10% in turns won't make a difference.
Norm
:I would like to rewind the choke of a Marconi 156 speaker. There was a short-circuit in the radio, which burned the power transformer as well as the choke. I started to unroll it. The first winding was easy to remove. 26 turns upwards (speaker cone on table, choke module on top). But by unrolling the second winding (very thin wire), I broke the wire! The tolerances are very large for capacitors and resistances (+-10 or +-20%). Is this the same thing for a choke? If I rewind the choke with of the same wire size, but without having the exact number of turns, I will have a similar choke? Is the direction of the choke winding is important? If so, where connects the first turn (nearest of the shaft)? On the rectifying tube or on the circuit?
:
:Thanks for your help!
:Jean-Francois
No, it's a choke not a power transformer. The choke is on the speaker... 2 wires for rectifying and 2 others with larger gage (inside) in series with output transformer, like all old radio... maybe this could help understanding.
J-F
:Hi J-F
:
: Since you have two windings could this be an output transformer? You can buy replacement output transformers. Neither the field choke or output transformer are critical. Plus or minus 10% in turns won't make a difference.
:
:Norm
:
::I would like to rewind the choke of a Marconi 156 speaker. There was a short-circuit in the radio, which burned the power transformer as well as the choke. I started to unroll it. The first winding was easy to remove. 26 turns upwards (speaker cone on table, choke module on top). But by unrolling the second winding (very thin wire), I broke the wire! The tolerances are very large for capacitors and resistances (+-10 or +-20%). Is this the same thing for a choke? If I rewind the choke with of the same wire size, but without having the exact number of turns, I will have a similar choke? Is the direction of the choke winding is important? If so, where connects the first turn (nearest of the shaft)? On the rectifying tube or on the circuit?
::
::Thanks for your help!
::Jean-Francois
I understand what you have. It's a field choke coil and hum bucking coil. Choke resistance isn't critical but there are a lot of turns. Resistance of a choke like this may be 1000 ohms which will work.
Norm
:Hi,
:
:No, it's a choke not a power transformer. The choke is on the speaker... 2 wires for rectifying and 2 others with larger gage (inside) in series with output transformer, like all old radio... maybe this could help understanding.
:
:J-F
:
::Hi J-F
::
:: Since you have two windings could this be an output transformer? You can buy replacement output transformers. Neither the field choke or output transformer are critical. Plus or minus 10% in turns won't make a difference.
::
::Norm
::
:::I would like to rewind the choke of a Marconi 156 speaker. There was a short-circuit in the radio, which burned the power transformer as well as the choke. I started to unroll it. The first winding was easy to remove. 26 turns upwards (speaker cone on table, choke module on top). But by unrolling the second winding (very thin wire), I broke the wire! The tolerances are very large for capacitors and resistances (+-10 or +-20%). Is this the same thing for a choke? If I rewind the choke with of the same wire size, but without having the exact number of turns, I will have a similar choke? Is the direction of the choke winding is important? If so, where connects the first turn (nearest of the shaft)? On the rectifying tube or on the circuit?
:::
:::Thanks for your help!
:::Jean-Francois
One other thing - direction of the winding isn't important but may require reversing the hum bucking coil leads. You will find out once the radio is operating. Connect the bucking coil to give least hum.
Norm
:Hi
:
: I understand what you have. It's a field choke coil and hum bucking coil. Choke resistance isn't critical but there are a lot of turns. Resistance of a choke like this may be 1000 ohms which will work.
:
:Norm
:
:
:
::Hi,
::
::No, it's a choke not a power transformer. The choke is on the speaker... 2 wires for rectifying and 2 others with larger gage (inside) in series with output transformer, like all old radio... maybe this could help understanding.
::
::J-F
::
:::Hi J-F
:::
::: Since you have two windings could this be an output transformer? You can buy replacement output transformers. Neither the field choke or output transformer are critical. Plus or minus 10% in turns won't make a difference.
:::
:::Norm
:::
::::I would like to rewind the choke of a Marconi 156 speaker. There was a short-circuit in the radio, which burned the power transformer as well as the choke. I started to unroll it. The first winding was easy to remove. 26 turns upwards (speaker cone on table, choke module on top). But by unrolling the second winding (very thin wire), I broke the wire! The tolerances are very large for capacitors and resistances (+-10 or +-20%). Is this the same thing for a choke? If I rewind the choke with of the same wire size, but without having the exact number of turns, I will have a similar choke? Is the direction of the choke winding is important? If so, where connects the first turn (nearest of the shaft)? On the rectifying tube or on the circuit?
::::
::::Thanks for your help!
::::Jean-Francois