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Old 14th October 2013, 05:02 PM   #1
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Default Current rating for power transformer.

Hello folks, does anybody know or have the spec for the power transformer for the Jolida 302/502b . Many thanks all
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Old 14th October 2013, 06:16 PM   #2
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here?
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Old 15th October 2013, 06:16 AM   #3
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Location: Broomfield, CO
Here's what's shown on my 502a and my 502b transformers:

302/502a
2 – 110V Primary windings
2 – 6.3V, 4A Secondary windings with taps at 5V
1 – 6.3V, 3.5A Secondary winding
1 – 70V, 100mA Secondary winding
1 – 370V, 500mA Secondary winding with taps at 10V and 350V

302/502b
2 – 115V Primary windings
2 – 6.3V, 4A Secondary windings
1 – 6.3V, 3.5A Secondary winding
1 – 70V, 100mA Secondary winding
1 – 370V, 500mA Secondary winding with taps at 10V and 350V
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Old 15th October 2013, 01:29 PM   #4
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Many thanks Ronald, that was a great help thanks .
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Old 16th October 2013, 01:55 AM   #5
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Default Jolida 502a Power Transformer

You're welcome. On the 302 and 502's the rating are printed on the bottom of the transformer.
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File Type: jpg Jolida 502a power trans.jpg (58.5 KB, 254 views)
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Old 16th October 2013, 10:21 AM   #6
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Ronald, many thanks, great help to get my own transformer winding made. Which of your two amps would you say sounds better to you . I'm undecided which to go for .
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Old 17th October 2013, 04:54 PM   #7
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Hi Ronald , thank you for all your help with the transformer details, but can I ask one small favour of you, is it possible to measure the distance between the bolts that hold it to the chassis. The distance horizontal, vertical and diagonal . Many many thanks Regards Ian
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Old 18th October 2013, 05:37 AM   #8
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Ian,

It may be a few days before I can get to it. Feel free to remind me if I don't answer by Monday.

Ron
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Old 22nd October 2013, 06:28 AM   #9
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Location: Broomfield, CO
Ian,

The power transformer appears to be made with EI-150 Laminations with a stack height of about 2.75".
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File Type: gif EI-150_25.gif (29.0 KB, 136 views)
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Old 28th October 2013, 09:40 PM   #10
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Hi Ronald, thank you for your last email, sorry for the late reply, but with one thing and another it's been quite busy here. Thanks for the measurements. Well once I can get a transformer made up I can start a build of my own. Again many thanks for your help. Regards Ian .
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