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In Reply to: RE: traces at last.... posted by vinnie2 on October 24, 2016 at 11:54:07
Vinnie, the 120 Hz energy is visible in the form of smaller peaks that fall in-between the 60 Hz energy. They're also occurring "underneath" the 60 Hz peaks, but being masked. This could all be caused by a number of things, and maybe more than one. Generally speaking, 60 Hz can be picked up from the PS magnetics or from the surrounding environment. 120 Hz might be from the PS filter or filament doubling (my 211s did that). If you want to probe the B+, you'll need a high-voltage probe. However, a simpler method is to model the PS in either PSUD or SPICE. If you know all the characteristics of the components in the power supply, the simulators will be very close to real world. 2.5V is quite a lot of ripple, so I suspect this is occurring in an early stage and being amplified.
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Buy Chinese. Bury freedom.
Edits: 10/24/16Follow Ups:
If it isn't in the psu, it might be coming from the rats nest huh? I may have to wait until I clean things up with the final build before I can get rid of it.
I did model the ps in psud2 before I put it together and I just did it again after double checking the schematic against what is out there. I have a 1500 vct trans with 3 1N4007 diodes in series off each leg going to the first 8H choke. There is an 87 uf cap between that and the next 8H choke and then another 87 uf cap with a 20 ohm/50w resistor across it. When I run this in psud2 I get what looks to me like only about .003 volts (3mV right?). That should be ok shouldn't it?
Edits: 10/24/16
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