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In Reply to: RE: center tap posted by kylealers@gmail.com on August 15, 2015 at 01:44:30
There are ways to improve the PSU, without re-designing the unit from scratch. Is this mod going into the bass pre-amp or the main bass DIY amp you wish to construct?
Better diodes, better filter caps, stable rail resistors are all good starting points.
Follow Ups:
So I decided to run my heaters in ac just for now I will hear how much the noise is. When my heater transformer doesn't have a centre tap is it important to make a artificial centre tap? Like in the pic?
Yes, artificial center tap is the way to go... if no actual CT.
Wrap the two heater lines together and with the two resistors making an artificial CT --- you'd be surprised how quiet the line is. Keep the heat lines above the socket surface and away from signal lines.
Like this:
This is the diagram exactly like I have it now any tips or hints before I test?
You sure you want to run the 12AX7 after the 5670? I thought you wanted one line with no TS and the other one with a TS. I think the gain stage with one 12AX7 as input tube is sufficient for your needs.
Just run another input into the 68k-ohm resistor before the first half of the 12AX7. OUT #1 from the 5670 to the bass amp input --- not connected to the 12AX7. OUTPUT #2, into a separate input of the bass amp.
Have each input jack ground out, when not in use. Then, plug the bass guitar into whichever gain stage that you want (no stack or tone stack).
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