A small file is what I use to square up round holes in metal. I was wondering if you might answer a question for me bud, do you stay exactly true to the circuit of those tube preamps as they come, meaning just off the board, or do you make modifications in the actual circuit as well? I understand you have done alot of monkeying with the tone and power circuits, well I dont mean to offend- thats just what I do-monkey with circuits. Anyway, I could feel capable of copying your work in my own way if the preamp circuits themselves have not been changed too awfully much from how they come and Im kinda familiar with tone and would go for it if I only knew a bit more about how the tubes are doing their thing. Also, plus and minus power is a bit confusing to me right now but Im constantly learning. Thanks for sharing this with the world buddy, its well-appreciated!
Up to this point I haven't modified the power supply part of the circuit, but I play around with everything from that point onward. Each component after the power supply has a big effect on tone, volume and distortion, so you could think of that whole part as creation of my own because I experiment with each part, one by one. It's kinda funny, earlier today I was coming up the stairs with a cup of coffee, and I almost spilled all over the place. That part wasn't funny. But, when I steadied the chaos in the cup, I suddenly realized that I should make an amp that has an untouched circuit. And now you're kinda asking about that. Funny. I could build it using the "6J1 Fever" schematic, and change nothing. See, the original schematic actually works pretty well, and sounds good. Plus it's safer, in general. They're running a little less plate voltage, so the tubes will last longer and distort less - which you might want, especially if you're planning on running a bunch of tubes together. Plus if I build it on the board and only move the tubes off, or go point to point, the whole thing should be quick and easy to build, easy to understand and follow along, and make a fool proof no-messing-around-solid-meat&potatoes kind of amp. And fun too.
The plus and minus power.... Grab a drink and get comfortable.... Ok so first of all, this circuit and power supply was designed to run off 12V AC. On account of that... well that's not a suitable amount of voltage to get current flowing across the plate of a 6J1 tube, actually. These tubes need about a 55v spread between the cathode and anode, or no current will flow. But the Chinese have hundreds of millions of these tubes in stockpile... So, a somewhat common and mostly compatible 12v AC power supply was selected, and a transistor to amplify the voltage on each end of the sign wave was worked into the schematic, which achieves the required voltage bias. After the 12v AC gets rectified into DC, each side of the frequency wave - separated by the polarity of the diodes and capacitors, goes through its own voltage amplifier. When the frequency wave reaches top dead center - like an engine - it jumps through the D667 transistors, which are designed to amplify a positive voltage. So here we'll have +28v AC (give or take a couple of volts depending on various factors). When the frequency wave reaches bottom dead center, it then jumps through the B647 transistors which are designed to amplify a negative voltage, and there we have -28v DC. It is a little confusing, but you can think of the middle of the energy wave as zero, so anything above that is "positive", and anything below that "negative". I used quotes there, because really it makes no difference what we call it, because it's all about how an energy wave propagates. An energy wave of any kind has to go up and down to move forward, so the middle line between movements is the thing to grasp. I hope that helps.
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Now that is well explain and very clear, i think better than a schematic diagram for us layman. Thank you
6:23 get a cheap chisel. It's much easier to make square or rectangular holes in a tin can. Cut it against a piece of wood.
Thanks. That's the answer.
A small file is what I use to square up round holes in metal. I was wondering if you might answer a question for me bud, do you stay exactly true to the circuit of those tube preamps as they come, meaning just off the board, or do you make modifications in the actual circuit as well? I understand you have done alot of monkeying with the tone and power circuits, well I dont mean to offend- thats just what I do-monkey with circuits. Anyway, I could feel capable of copying your work in my own way if the preamp circuits themselves have not been changed too awfully much from how they come and Im kinda familiar with tone and would go for it if I only knew a bit more about how the tubes are doing their thing. Also, plus and minus power is a bit confusing to me right now but Im constantly learning. Thanks for sharing this with the world buddy, its well-appreciated!
Up to this point I haven't modified the power supply part of the circuit, but I play around with everything from that point onward. Each component after the power supply has a big effect on tone, volume and distortion, so you could think of that whole part as creation of my own because I experiment with each part, one by one.
It's kinda funny, earlier today I was coming up the stairs with a cup of coffee, and I almost spilled all over the place. That part wasn't funny. But, when I steadied the chaos in the cup, I suddenly realized that I should make an amp that has an untouched circuit. And now you're kinda asking about that. Funny.
I could build it using the "6J1 Fever" schematic, and change nothing. See, the original schematic actually works pretty well, and sounds good. Plus it's safer, in general. They're running a little less plate voltage, so the tubes will last longer and distort less - which you might want, especially if you're planning on running a bunch of tubes together. Plus if I build it on the board and only move the tubes off, or go point to point, the whole thing should be quick and easy to build, easy to understand and follow along, and make a fool proof no-messing-around-solid-meat&potatoes kind of amp. And fun too.
The plus and minus power.... Grab a drink and get comfortable....
Ok so first of all, this circuit and power supply was designed to run off 12V AC. On account of that... well that's not a suitable amount of voltage to get current flowing across the plate of a 6J1 tube, actually. These tubes need about a 55v spread between the cathode and anode, or no current will flow. But the Chinese have hundreds of millions of these tubes in stockpile... So, a somewhat common and mostly compatible 12v AC power supply was selected, and a transistor to amplify the voltage on each end of the sign wave was worked into the schematic, which achieves the required voltage bias.
After the 12v AC gets rectified into DC, each side of the frequency wave - separated by the polarity of the diodes and capacitors, goes through its own voltage amplifier.
When the frequency wave reaches top dead center - like an engine - it jumps through the D667 transistors, which are designed to amplify a positive voltage. So here we'll have +28v AC (give or take a couple of volts depending on various factors).
When the frequency wave reaches bottom dead center, it then jumps through the B647 transistors which are designed to amplify a negative voltage, and there we have -28v DC.
It is a little confusing, but you can think of the middle of the energy wave as zero, so anything above that is "positive", and anything below that "negative".
I used quotes there, because really it makes no difference what we call it, because it's all about how an energy wave propagates. An energy wave of any kind has to go up and down to move forward, so the middle line between movements is the thing to grasp.
I hope that helps.
@@TheFlippy1 wow, that was really good, thank you!