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In Reply to: RE: Sure... posted by FenderLover on August 11, 2015 at 09:44:08
What's the difference between a inline rectifier bridge and a normal one? Juts noticed something
Follow Ups:
Just two different ways to draw the schematic for the same thing.
Is it important if my heater transformer doesn't have a centre tap to make a artificial centre tap?
If you are going to wrap the two leads to lower hum (only works if current is AC) --- then it is important to "center" the wave form. That is what using 100-ohm or 220-ohm resistors does.
However, if you convert the heater taps to DC, you do should not do this.
Awesome thanx for the advice man my heater tranny is 6.3VAC 1,42amps it would be better using 220ohm than 100ohm? Here is some pics of the pre amp so far.
I like 100-ohm resistors. 1/2 watt, 5 or 10% is fine.
Hey! What kinda beer? I like Dos Equiis, while soldering.
8^)
That's carling black label its a local beer here in south africa everybody drinks it here very cheap but also one of the best
Beer always makes my fingers "looser" and the ears "better."
8^)
Where will be best to earth this artificial centre tap?
Tie one end of the two resistors together. Solder this pigtail to a lug which is bolted to the chassis. You can do this at the power lamp (which is the first to get the heater line tap from the PT, in most Fender amps). Or anywhere close to the tap point off the PT.
See the two 100-ohm resistors tied to ground, after the power lamp in this Super Reverb? The clipped, heavy green lines come from the PT.
I've downloaded PSU designer and I want tweak this power supply a bit how do I calculate the load resistance? and how do I know what resistance a capacitor holds?
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.
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).
I pushed the thread up to the top, with new thread. If that helps you.
that 85-100 --- reliable, road-worthy --- watts are about the limit of most tube designs. Esp in the bass range.
Consider the Ampeg B15N design. One of the most used bass amps, in recording studio history. Miking it to the house system is a viable solution. You get reliable mega 100's of watt of power, with the silky smooth output tube OD of the 6L6GC tubes.
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