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Original Message
Can someone please do a check run on psud2 for me?
Posted by vinnie2 on January 3, 2017 at 15:37:58:
I am getting what looks like a weird ripple for the power supply the way it is loaded with the 813's. Wondering if I am doing something wrong. Data is
full wave tube 5ar4 rectifier
power transformer has a half no load output of 432.8 vac per Hammond (278x)
first cap is 2.2uf
first choke is 10 H/65 ohms (Hammond 193M)
second cap is 94 uf
second choke is 5H/55 ohms
third cap is 94 uf
load is 160 mA based on measuring an average of 40 mA plate current across the cathode resistor (355vdc/750 ohm cath resistor)
When I run this I get a low value for the ripple of about 2 or 3 mV, but a very high frequency that make the band quite thick looking. Never have seen this before. Am I doing something incorrectly?