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December 05, 2019, 04:51:10 AM

Author Topic: a cautious voltage question for stereomour II  (Read 819 times)

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Offline Jay

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a cautious voltage question for stereomour II
« on: October 29, 2016, 12:24:06 PM »
My power line voltage read 122.5V.  My power transformer secondary tests were all well within 10% except the voltage across 19-20 was 170.4V, barely outside the 5% tolerance around the 161V ideal.  Is this close enough for jazz?
Thanks, Jay
Jay L.

Offline Doc B.

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Re: a cautious voltage question for stereomour II
« Reply #1 on: October 29, 2016, 01:09:54 PM »
Yup, that's OK.
Dan "Doc B." Schmalle
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Offline BJK

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Re: a cautious voltage question for stereomour II
« Reply #2 on: September 19, 2017, 02:01:57 AM »
I'm having almost the same issue. Voltage from the mains is just a scant shy of 125. All the smaller voltages are very close, well within the 10% tolerance.

But for the 19-20, it was 171 -- just outside the +/-5%. I assume it's okay?  Curious why the tolerance is 5% here? I'm assuming it's a variation in the transformer, that it's a little high here?

Online Paul Birkeland

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Re: a cautious voltage question for stereomour II
« Reply #3 on: September 19, 2017, 03:56:49 AM »
But for the 19-20, it was 171 -- just outside the +/-5%. I assume it's okay?  Curious why the tolerance is 5% here? I'm assuming it's a variation in the transformer, that it's a little high here?
As stated above yes, it's OK.  When we wrote the manual I just swept the variac across the range of voltages indicated to determine what the transformer secondary windings would show.  Being off by 6% instead of 5% isn't cause for alarm.

Paul "PB" Birkeland

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