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Old 2nd September 2015, 09:19 PM   #1
pioux is offline pioux  France
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Default GZ32 vs ss rectifier

Is there a way to replace a gz32 by a ss with start delay
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Old 2nd September 2015, 11:11 PM   #2
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Consider the voltage drop on a valve rectifier.
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Old 3rd September 2015, 12:22 AM   #3
Bigun is offline Bigun  Canada
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Originally Posted by pioux View Post
Is there a way to replace a gz32 by a ss with start delay
Just put a resistor in series with the SS rectifier to get a) voltage drop equivalent to tube rectifier b) lower peak charge current into the filter capacitors, c) less stress on the power transformer

I don't see any need for a start delay unless you have a circuit topology that is sensitive to the power-on.
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Old 3rd September 2015, 01:21 AM   #4
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While a delay in B+ rise may not be essential, it's easy enough to obtain. Use a CL-90 inrush current limiting thermistor. The negative temperature coefficient (NTC) device will not delay rise as much as a vacuum rectifier with a cathode sleeve, like the GZ32/5V4, but the delay it provides is usually adequate.

Please post your unit's schematic so the members can make reasonable suggestions as to how the PSU filter should be tweaked.
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Old 3rd September 2015, 04:53 AM   #5
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