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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 24th Sep 2019, 10:46 pm   #1
ribbonmicsrus
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Default Hro-5m psu

I am restoring an HRO-5M, that is in excellent condition. However the 697 Rack PSU was not. I started rebuilding it aabout 5 years after it had cooked itself but not finished it.
Can anyone tell me the correct values of filter components C112, 113 and 114, also the inductance of L102.

I have copious amounts of paperwork, but cannot find PSU details.

Andy G3UEQ
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Old 25th Sep 2019, 12:09 am   #2
Dave757
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Default Re: Hro-5m psu

Hi Andy,

C12/13/14 are 8 +8 +8 MicroFarads at 475 VDC working
L2 is 17H

Manual with all details is at BAMA Archive go to National,
and then to item hrops.

Kind regards
Dave G0ELJ
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Old 25th Sep 2019, 8:26 am   #3
ribbonmicsrus
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Default Re: Hro-5m psu

Thanks Dave.

I have luckily a suitable choke near that value rated at 125mA, so that will work nicely.

Cheers
Andy
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