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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 26th Jul 2020, 11:34 am   #1
gingpeakin
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Default All-Power Transformers Regulated power supply

Has anyone any details about this beast? I inherited some years ago.
0 to 500V at 250mA with a seperate 0 to -250V bias and heater supplies. And it works perfectly!
I may be sufficiently bored soon to draw up the circuit.

Ging
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Old 26th Jul 2020, 1:23 pm   #2
merlinmaxwell
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Default Re: All-Power Transformers Regulated power supply

Any chance of a picture? I just wonder what would need -250V bias!
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Old 26th Jul 2020, 1:39 pm   #3
factory
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Default Re: All-Power Transformers Regulated power supply

I don't have any info, but did recognise the PSU as one sold locally very recently, a Model 504;

David
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Old 26th Jul 2020, 4:16 pm   #4
gingpeakin
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Default Re: All-Power Transformers Regulated power supply

Apologies - I forgot to press the upload button. It does indeed look like the one pictured - this is a model 505 with 4 807s in parallel for the positive supply and another for the negative.
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Old 27th Jul 2020, 6:57 am   #5
Diabolical Artificer
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Default Re: All-Power Transformers Regulated power supply

Nice useful PSU, I'd have a look at those caps though, they'll look well old and tired. What's that pink wire bodge from the tfmr with the wires hanging loose, a LT tap?

Andy.
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Old 27th Jul 2020, 8:30 am   #6
M0FYA Andy
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Default Re: All-Power Transformers Regulated power supply

From memory those block capacitors are electrolytics and not paper, so be doubly cautious, I imagine they could fail quite dramatically!

Andy
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Old 27th Jul 2020, 9:08 am   #7
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Default Re: All-Power Transformers Regulated power supply

Those large metal rectifiers look like they could release a good deal of unpleasantness if they should fail too. I have one of these supplies waiting for the ever-absent round tuit. I might well disconnect the rectifiers and hide silicon ones with suitable resistors somewhere nearby.

Cheers,

GJ
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Old 27th Jul 2020, 11:05 pm   #8
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Default Re: All-Power Transformers Regulated power supply

The under-chassis layout and wiring is simply a work of art.

Al.
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