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Old 14th Sep 2020, 7:52 am   #1
FIXITNOW
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Default Battery Eliminator Ekco C2A info please

picked this up many years ago final got round to opening it up sadly got at seems to be missing the Grid Bias potentiometer as shown in pdf ?? from what I can see anyone know its value or got a circuit please
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Old 14th Sep 2020, 7:53 am   #2
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Default Re: Battery Eliminator Ekco C2A info please

more pics
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Old 15th Sep 2020, 7:03 pm   #3
FIXITNOW
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Default Re: Battery Eliminator Ekco C2A info please

has anyone else got one off these ? that they would be happy to open and do me a picture off the pot and how its mounts plus its value please
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Old 15th Sep 2020, 8:00 pm   #4
AC/HL
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Default Re: Battery Eliminator Ekco C2A info please

I don't think there is a pot as such, it seems to be a tapped resistor. Something was glued in that space. Difficult to make out, but it could be MH (McMichael). The green wire is non-original.
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Old 15th Sep 2020, 9:29 pm   #5
Ed_Dinning
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Default Re: Battery Eliminator Ekco C2A info please

Hi, as the grid is a high impedance circuit the GB chain was often just a chain of say 100K resistors with another one in the top to set the 9 volt connection

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Old 15th Sep 2020, 11:33 pm   #6
AC/HL
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Default Re: Battery Eliminator Ekco C2A info please

It's a very early eliminator, from the early years of Ekco before they progressed to radio receivers. Later on most dispensed with the grid bias outputs as the batteries lasted indefinitely, and were housed in the radio.
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Old 16th Sep 2020, 7:57 am   #7
FIXITNOW
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Default Re: Battery Eliminator Ekco C2A info please

yes the green wire looks as if someone has done some rewiring and yes the 3 ends could be a tapped resistor will hunt and see if I have any and try about 100k .if any one could do a picture please
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Old 16th Sep 2020, 9:21 am   #8
John M0GLN
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Default Re: Battery Eliminator Ekco C2A info please

I can't help with any other info' but attached is an advert from the 'Northern Radio & Cycle Supplies' Darlington 1930-31 catalogue which may be of some interest.

John
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Old 16th Sep 2020, 12:14 pm   #9
AC/HL
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Default Re: Battery Eliminator Ekco C2A info please

It doesn't look from the photos that anything is missing. Something was added and then removed.
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Old 16th Sep 2020, 12:30 pm   #10
FIXITNOW
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Default Re: Battery Eliminator Ekco C2A info please

Quote:
Originally Posted by AC/HL View Post
It doesn't look from the photos that anything is missing. Something was added and then removed.
on the pdf I uploaded it indicates there is a grid bias potentiometer

so the fact I have 3 wires pushed me to the assumption there should be a pot to set up internally

but maybe not

but as the green wire seems to be a rewire and the wires seem to be there in the pdf

I really need to see another to sort out this confusion
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