New project stuff maybe?

vigilante398 said:
Yeah I'm a little nervous. Like on the one hand I'm confident in Jeff's abilities, but on the other hand I've had intense battles making high-gain tube circuits play nicely in pedal formats. Boards have been ordered, so we'll see what happens when they come in a couple weeks.
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When I'm designing a layout for an amp I always keep the preamp tubes at least 2" away from each other. Of course this is hundreds of volts, but the "coronal effect" is real. Run away oscillation is a b***h......
 
what if you mounted two of the tubes perpendicular and two horizontal in the enlosure. Like two popping out the top and two as is. would that minimize the coronal effect? alternate horizontal then perpendicular so their fields dont overlap as much
 
I sincerely doubt this is corona effect. At the frequencies this circuit operates at we're way below the corona inception voltage. I assume it's simple parasitic capacitance and crosstalk of sensitive high gain lines. Care was taken to reduce it, but this is an extremely high gain circuit, and maybe the distance between the traces just isn't enough.
 
vigilante398 said:
I sincerely doubt this is corona effect. At the frequencies this circuit operates at we're way below the corona inception voltage. I assume it's simple parasitic capacitance and crosstalk of sensitive high gain lines. Care was taken to reduce it, but this is an extremely high gain circuit, and maybe the distance between the traces just isn't enough.
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Miniaturizing a fusion reactor is not an easy task.
 
iamjackslackof said:
I don't know if you guys are just fucking with the rest of us non-EEs now lol
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It's basically where high voltage lines (most commonly AC transmission lines) are running so high that they start to reach the dielectric breakdown voltage of the air (the same inherent thing that causes static shocks and voltage arcs), causing what looks like a glowing (corona) around the line. It's typically in the kV range, but the higher the frequency of the signal, the lower the voltage needed for it to happen. So with 350V being the max voltage found anywhere in the circuit and all of our signals at that voltage being low frequency, it's unlikely to happen in something like this.

Hopefully there are enough non-EE-specific words in there to make sense of it :confused:
 
vigilante398 said:
I sincerely doubt this is corona effect. At the frequencies this circuit operates at we're way below the corona inception voltage. I assume it's simple parasitic capacitance and crosstalk of sensitive high gain lines. Care was taken to reduce it, but this is an extremely high gain circuit, and maybe the distance between the traces just isn't enough.
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On the 5e3 I had that exhibited this, it would kick in at around 60% volume. The wire leading to v2 was the culprit presumably feeding back into the more sensitive first stage. In one position there would be a perfect signal on the scope, then you could move the wire (chopsticks) and watch it go into a box full of squiggly lines. I found that by moving this wire, you could actually change the breakup of the amp.

Leading credence to the saying that no two tweed deluxe sound the same...

I settled for this configuration for the rest I made, note the odd positioning of the blue wire. This gave the most headroom before breakup, which is a great thing for 5e3's since they have loads of juicy distortion at anything over 3. With this I can actually get up to about 5 before it begins to roar.

blue wire 5e3.jpeg
 
Mentaltossflycoon said:
I'm a Jeffrey and I have never met a Jeffery. I've decided that it's just how a quarter of all people THINK it's spelled. I have absolutely nothing to back this claim. Do Jefferies pronounce it with 3 syllables?
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My brother’s name is spelled Jeffry. My mom swears that it’s because she and dad liked the sound of the name but didnt know how to spell it.
 
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