Is there something along the lines of a "map" that shows how the signal from the guitar goes from the input to the output?
I realize the short answer is,, "look at the schematic doofus!" or words to that effect, but my schem reading skills are still very much at the novice level.
I am planning to make a #183/bluesmaster clone.
I have the layouts and schem's from the document section to start writing my BOM and it occurred to me that this would be a great opportunity to try and improve my schem reading skills and maybe get a better understanding of what is going on with the various AC and DC currents flowing around up in side the joint.
My level of understanding is growing.
I've been trawling around on here, and also over on the Metro forum, for a while now and i'm loving this journey of discovery.
Right now i feel i have all of these pieces of knowledge that keep bumping into each other and i just need a little glue to help stick them all together more permanently in my skull pan.
Cheers..
topography of a Dumble.
Moderators: pompeiisneaks, Colossal
Re: topography of a Dumble.
Hi Homebelly, here is a chart that will show you how the different currents, voltages and signal pathes flows on an amp:
http://www.el34world.com/charts/currentflow.htm
Hope it helps.
http://www.el34world.com/charts/currentflow.htm
Hope it helps.
Horacio
Play in tune and B#!
Play in tune and B#!
Re: topography of a Dumble.
cheers.
i have that...
i'm hoping there my be an explanation or visual break down of how it all works in a dumble. i have a schem with a block diagram on it that goes some of the way. Ultimately i'll probably be able to write my own, i'm just looking for a simple break down to get me on my way. I can kinda sorta follow the audio path on a layout, but start getting lost once it gets to the tone stack and stuff starts getting grounded and so on..
any ways..
Baby steps, and always forward..
i have that...
i'm hoping there my be an explanation or visual break down of how it all works in a dumble. i have a schem with a block diagram on it that goes some of the way. Ultimately i'll probably be able to write my own, i'm just looking for a simple break down to get me on my way. I can kinda sorta follow the audio path on a layout, but start getting lost once it gets to the tone stack and stuff starts getting grounded and so on..
any ways..
Baby steps, and always forward..
Re: topography of a Dumble.
Here's a sort of simple way to look at the tone stack in say the case with the Skyliner: The signal hits the input of it, at the very output of the preceding 12AX7 stage (V1A in Dumble's case). From there, there are two options:
1. Travel through a small coupling cap to the treble pot, which will feed the volume control and the next stage, V1B. It is intuitive at this point that the bigger this coupling cap, which is the treble cap, the more lower-frequency content will be able to pass to the next stage at high treble settings.
2. Travel through the slope resistor to the junction of the bass and middle caps. Right off the bat, this is telling you that the higher the slope resistor, the more isolation there will be with respect to the middle and bass controls, or in other words, the stronger the effect of the treble control.
2A. After the signal has passed through the slope resistor, one possible solution is that it travel to ground through the middle cap and pot. The pot is a variable resistor to ground, so the lower the setting of the middle pot, the more signal will go straight to ground. Also note that the smaller the value of the middle cap,(RC Circuit) the less amount of lower-frequency content will be dumped to ground. Or in other words, the smaller the middle cap, the thicker the amp will sound.
2B. Also after the slope resistor, whatever doesn't go to ground via the middle cap + pot, will try to go through the bass cap. At the output of that cap, the signal has two choices: either choose to travel to the bottom of the treble pot -- in which case it will make its way to the preamp volume control and therefore to V1B (next stage) -- or go to ground through the bass pot, if this path offers less resistance (i.e., depending on the setting of the bass pot).
In short..If you analyze the treble circuit separate from the middle and bass filters and slope (although they do work together) and think of the treble pot as a kind of panning circuit or mixer,dial that up pretty high, and the treble cap will have a lot to say about what the sound will be like; dial that lower, and then it will be up to the bass and middle controls to determine what other frequencies pass to the next stage, V1B.
it may make better sense to you..
In PAB mode the connection between the bass control and treble pot (mixer) is broken, this prevents the lower frequency's from being passed to the treble pot relieves some of the load while boosting the mid and treble frequency's on the way to V1B..
This is why the taper of the treble pot is pretty important..IMO
Fender CTS 2-35
Hope this helps!!
Tony
1. Travel through a small coupling cap to the treble pot, which will feed the volume control and the next stage, V1B. It is intuitive at this point that the bigger this coupling cap, which is the treble cap, the more lower-frequency content will be able to pass to the next stage at high treble settings.
2. Travel through the slope resistor to the junction of the bass and middle caps. Right off the bat, this is telling you that the higher the slope resistor, the more isolation there will be with respect to the middle and bass controls, or in other words, the stronger the effect of the treble control.
2A. After the signal has passed through the slope resistor, one possible solution is that it travel to ground through the middle cap and pot. The pot is a variable resistor to ground, so the lower the setting of the middle pot, the more signal will go straight to ground. Also note that the smaller the value of the middle cap,(RC Circuit) the less amount of lower-frequency content will be dumped to ground. Or in other words, the smaller the middle cap, the thicker the amp will sound.
2B. Also after the slope resistor, whatever doesn't go to ground via the middle cap + pot, will try to go through the bass cap. At the output of that cap, the signal has two choices: either choose to travel to the bottom of the treble pot -- in which case it will make its way to the preamp volume control and therefore to V1B (next stage) -- or go to ground through the bass pot, if this path offers less resistance (i.e., depending on the setting of the bass pot).
In short..If you analyze the treble circuit separate from the middle and bass filters and slope (although they do work together) and think of the treble pot as a kind of panning circuit or mixer,dial that up pretty high, and the treble cap will have a lot to say about what the sound will be like; dial that lower, and then it will be up to the bass and middle controls to determine what other frequencies pass to the next stage, V1B.
it may make better sense to you..
In PAB mode the connection between the bass control and treble pot (mixer) is broken, this prevents the lower frequency's from being passed to the treble pot relieves some of the load while boosting the mid and treble frequency's on the way to V1B..
This is why the taper of the treble pot is pretty important..IMO
Fender CTS 2-35
Hope this helps!!
Tony
" The psychics on my bench is the same as Dumble'"
Re: topography of a Dumble.
Tony, I have read dozens of your theory posts and I find them so very informative, I have learnt tons from them.
Can't thank you enough!
All the best.
Can't thank you enough!
All the best.
Horacio
Play in tune and B#!
Play in tune and B#!
Re: topography of a Dumble.
cheers tony..
i'm going to get the schem's and layouts printed out on big big paper and go through them. this is a great start.
happy holidays..
i'm going to get the schem's and layouts printed out on big big paper and go through them. this is a great start.
happy holidays..
Re: topography of a Dumble.
Cool!!..You can PM me if you get stuck..Homebelly wrote:cheers tony..
i'm going to get the schem's and layouts printed out on big big paper and go through them. this is a great start.
happy holidays..
Happy Holidays Back..
Tony
" The psychics on my bench is the same as Dumble'"