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In Reply to: RE: 5R4G and 5U4G condenser output value posted by DAK on January 21, 2017 at 11:55:04
" This is the Heath W5M and right off the rectifier they use a pair of 40uf in series,giving you an effective 20uf at 900 volts.Just get a 12uf to 15uf film cap and you will be fine.I have seen one 5R4g coke bottle fail out of all the W5Ms and that was because the cap was shorted and they jumped out the fuse.The W5Ms also had a thermal resistor with contact tabs but I just put in a CL90 and it does the job.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
It is likely true that he will be fine with a 12uf to 15uf input cap but neither you or I can know that for sure without first knowing the total current draw, the voltage ratio and DCR of the power transformer windings and the voltage.
The 5r4 has a peak repetitive current rating of .65 amps.
Here's an example where a 4uf cap is too large and the peak repetitive current rating is being exceeded 120 times a second (60 times per second, each diode).
Tre'
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