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Old 26th Apr 2019, 7:49 am   #1
snowman_al
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Default Heathkit MA-12 Parts. Output Transformer and Capacitor

As the title, to complete a stereo pair of amplifiers.

I'm looking for an output transformer for the MA-12 amplifier. The one I have has a high resistance on one side of the primary.

Also does anyone have a smoothing capacitor for this?
The large 60uF + 250uF one (C1 on the diagram). I only need the can as I will replace the internals so 'dead' is perfect.
I know these were used in other places TVs etc. I just want it to match the good example I have if possible.

Let me know if you have anything to help get number 2 working.
Thanks, Alan
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Old 26th Apr 2019, 8:51 am   #2
Ed_Dinning
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Hi Alan, if all else fails the transformer can easily be rewound. There may be equivalents out there, but this would preserve the look of the amp.

Ed
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Old 12th May 2019, 2:16 pm   #3
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Thanks Ed, it looks like it will come to that.

Still looking for both parts. Even a scrap amp?

Thanks, Alan
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Old 12th May 2019, 2:34 pm   #4
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Would a cap/can of a different value do? I've a few of similar size which looks like 35mm dia.

Andy.
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Old 12th May 2019, 4:07 pm   #5
snowman_al
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Hi Andy,
Any value is fine. It is just to look 'right' and match the original.
Which is 35mm diameter by 4 1/4 inches tall. (Better still if it has the transparent sleeve...) All the scrap ones I have are too short by an inch.
I have the correct caps to go inside as replacements so a dead one is best.
Cheers, Alan
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Old 13th May 2019, 5:08 pm   #6
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Hi Alan,

Regards the 250+60uF capacitor If nothing comes to light in the next few days, Iím fairly sure I may have one or even two, which were removed from a MA12 I was restoring.

Sadly, it may take a few days to have look though as they are with my workshop stuff which is stored away. Iím hoping to get to the container as I need some other bits and pieces.

Terry
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Old 14th May 2019, 6:06 pm   #7
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Terry,
Yes, please have a look when you can. I am interested if you have one. All costs covered of course.
Alan
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Old 17th May 2019, 9:18 am   #8
Valvepower
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Hi Alan,

Righty-ho located a 60+250u ĎHeathkití capacitor - there was only one in the end!

Send me a PM and we can arrange to get it over to you.

Itís FOC

Regards
Terry
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Old 17th May 2019, 9:31 am   #9
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Many thanks!
PM on its way, Alan
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Old 23rd May 2019, 7:04 am   #10
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Default Re: Heathkit MA-12 Parts. Output Transformer and Capacitor

Thanks to Terry's generosity, I now have a matching capacitor for my no. 2 chassis.

Just need an output transformer now... anyone?
Alan
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