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In Reply to: RE: Can I ground the center tap of the 5v supply? posted by Chip647 on July 17, 2014 at 05:08:31
Yes, I am listening to the phono pre breadboard through the line stage.Is there any advantage to taking the B+ off the center tap?
I will give those other things a try and see what happens.
I do have dc on the filaments already.
Edits: 07/17/14Follow Ups:
Then taking the B+ of the 5V center tap should definitely be quieter. What tube are you using?
It wil help troubleshoot if you determine whether your hum has a 60Hz or 120Hz fundamental (or 50 or 100 if you are in Europe etc.) An oscilloscope trace would be even better.
I have a scope but am new to using it. if you can tell me how to take the measurement I can give it a whirl.
I know how to hook up the probe and get a trace, just not sure what I need to do to determine what the frequency is.
The rectifier is a 5V4G.
Edits: 07/17/14
so you probably shouldn't take the B+ from the 5V center tap; just use pin 8.
Oscilloscopes vary a bit in their control layout. I suggest consulting the manual for your 'scope, or look for online tutorials about the general approach. You need to know what the time divisions on the horizontal axis represent, take the period of the waveform then calculate the reciprocal for the frequency.
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