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Old 25th Aug 2009, 5:06 pm   #1
Paul LS
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Default Ekco AC86 help please... part 1

Hi, I am trying to rebuild a sad AC86 and need to replace the output transformer as the primary is open circuit. Eventually I would like to get a period replacement part or have it rewound. Meanwhile I am after a replacement so I can get it up an running for "eventual" testing.

The output valve specified is the AC/PEN which has an optimum load of 7500 to 8000 ohms. Could I use a later part say an output transformer with a primary impedance of 7000 ohms, secondary 3/4 ohms, the sort that would be used with an EL41 output valve?

Thanks for your help,
Paul.
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Old 25th Aug 2009, 5:12 pm   #2
Steve_P
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Default Re: Ekco AC86 help please... part 1

Yes. The only problem would be a slight loss of volume. Go ahead.

Cheers,

Steve P.
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Old 25th Aug 2009, 5:17 pm   #3
Paul LS
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Default Re: Ekco AC86 help please... part 1

Thanks for your help Steve.

Paul.
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Old 29th Aug 2009, 12:11 am   #4
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Default Re: Ekco AC86 help please... part 1

Also check the plate current isn't excessive, which could be caused by a fault in the OP Valve's biasing arrangements. Excessive plate (Anode) current will cause the primary winding to fail.
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Old 29th Aug 2009, 12:21 pm   #5
Paul LS
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Default Re: Ekco AC86 help please... part 1

Thanks "mister valve"... but no need to worry about that!!! My avatar is the set I am working on. As you can see it has no valves at all at the moment... I need to acquire them all. Firstly I am trying to determine which parts are still good, note the rust on the chassis surface.

PS Welcome to the forum.
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Old 29th Aug 2009, 12:36 pm   #6
Phil G4SPZ
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Default Re: Ekco AC86 help please... part 1

Paul, I have an AC/PEN which you can have for the cost of postage. What other valves do you need?
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Old 29th Aug 2009, 5:50 pm   #7
Paul LS
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Default Re: Ekco AC86 help please... part 1

Wow thanks Phil. I have been slowly gathering the valves... infact the AC/PEN is the one I have been having trouble finding. I will send you a PM.

Paul.
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