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In Reply to: RE: 5R4G and 5U4G condenser output value posted by Uncle Mike on January 21, 2017 at 14:00:07
as the value of their first cap. For example, Heathkit did not bother with that cap limit and used a pair of 40uf x 400v (if memory serves) in series.
That net 20 μF. is in line with what some 5R4 data sheets show. Your 12 μF. should be just fine at the voltages found in most tubed audio circuitry.
You can make quite certain of safety by installing a CL-130 inrush current limiting thermistor between the rectifier and the PSU filter.
"You can make quite certain of safety by installing a CL-130 inrush current limiting thermistor between the rectifier and the PSU filter."
The max input cap value stated in the datasheets has to do with peak repetitive charging current rating.
The turn on surge current rating is much larger.
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