Framus cobra guitar amplifier
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Framus Cobra 100 Watt Tube Head Black, Near Mint, $1,279.00
Post custom amp, guitar and fx mods. Share details about your custom builds. Framus Cobra dB mod. You do not have the required permissions to view the files attached to this post. Re: Framus Cobra dB mod. Welcome to the fold brother! Can you add a volume pot to the fx loop send?
The easiest thing to do is to plug in a Carl's Custom volume box in, between the fx send and your effect I had post already to go - but got distracted at work - and must not have hit 'submit' Ebtech also makes units - here is their web page.
Yeah well, the thing is.. Also I like to tinker and learn new stuff. I understand they need to make a living, but some things are taken too far.
And yes, I could add a volume pot to fx loop send, but my concern is will there be enough level boost on the return? The DD volume level should be able to compensate for using a volume pot to reduce the fx send signal. You could build one for less so, why not give it a try? Test it externally Okay, I'll try that. And if I want a return level adjustment should I put something like a K or K volume pot where R46 is? The return level pot doesn't do much, which makes sense to me now, being that the signal doesn't go through the pot.
It can be made more effective if need be, just needs a bit more fiddling. The send level pot has a much greater effect, which was expected. But somehow it also acts as a low pass filter. A really noticeable one too, which is not what I'm hoping for. Am I missing something here? How have you wired it up? A k pot is going to be too big and at lower settings will shunt a lot of treble to ground, much in the same way your gain pot does and why bright caps are used.
This is the send from ye typical engl circuit: Try that. It's a must have. I thouhgt about k pot being too big, so I took it out and tried various resistors instead, like 47k in signal path and 4. The affect is always the same, very noticeable loss of highs, bite and attack. Higher master volume doesn't help. Maybe there is a way to make the amp sound good at lower channel volume?
Right now anything below 3 o'clock is rreeaally fizzy and dull. Dialing gain back to does take the fizz away but it's not enough brootz for me. Sloclone has lots of mods for the slo and this is pretty much the same thing so look there for inspiration about the fizz. They'll have some thoughts on the loop too.
First things I'd try are reduce the cold clipper from 39k to anywhere between 4k and 22k. People tend to like k here. That smooths the high end hash from the cold clipper. You can also try increasing the 4th stage grip stopper from k to k or k to kill some fizz.
So apparently it took me almost a year to solve this issue. I tried swapping, adding and removing a lot of parts. Some were an improvement, most were not. Changed plate resistors, added plate bypass caps, removed cathode bypass caps, increased nfb etc. Turns out cobra's fizz is largely coming from it's big coupling capacitors. Who knew cutting low end would calrify highs aswell. I removed R4, and changed C9 to 2n2 and C41 to 3n3. Most of the fizz is gone, even at lower channel- and master volumes.
Even the precence is somewhat useable now. This also solved the need for attenuating fx-send level. I feel like I'm getting even stronger bass, but it's not overloading the fx-loop anymore. There is still some fizz on low volume and higher gain levels, but it also gets a bit mushy with higher gain. So I guess I want the amp to feel a little easier to play with gain at current level.
I think it comes down to cathode resistor values..? Cool to hear you've made some progress with it I guess when you look at what the coupling caps are doing from an intermodulation distortion perspective then lowering them could remove hashiness be restricting the bandwidth contributing to IM. The first coupler in a ii is p! For modern metal tones a hell of a lot of bass is cut early on. Moodknyller wrote: So apparently it took me almost a year to solve this issue.
So it 47n. Typical rectifier slo values are 22n. All of that is relative. The framus had a fake depth but I would say my avenger had the most quality control over bass, very feeling but never in the way the rectifier seems to lose control. You can't dime the bass on the rectifier but you can on the soldano. Same preamp. Different choke properties different transformers etc. The framus you could go sub low but I still prefer the soldano over it. Thought I'd share a little update here, been lurking at sloclone for the past year or so.
Turns out I know next to nothing about tube amp technology! I had a g-major for a long time, swapped it with a DD Hated the parallel loop, it gave me weird sounds and phase issues. Too much send level distorted the delay, even though DD should have enough headroom for line level. I put a merlin style loop in my Cobra, with adjustable send and return levels at the back. Threw away the mix pot, because I had no use for it anymore, and put a soldano-style depth instead of a fixed depth in NFB.
So now I have Depth and Deep at the front panel. After that 3n3 and 4n7. Helps with different guitars and styles of music. What I noticed recently, was that the grid stopper between 3rd and 4th stage was giving me a lot of hiss and fizz. Too much grid resistance was a blanket and gave even more idle noise. So I turned it into a voltage divider. It made the amp dead quiet and fizz free with good highs and clarity, but lost distortion and felt like low notes were almost clean, if that makes sense.
So now I'm trying to find a balance having 4n7, k, k to ground, 68k grid. These are probably stupid values to use, and if someone with better understanding of the maths behind it wants to educate me, please do so.
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Post custom amp, guitar and fx mods. Share details about your custom builds. Framus Cobra dB mod. You do not have the required permissions to view the files attached to this post. Re: Framus Cobra dB mod. Welcome to the fold brother! Can you add a volume pot to the fx loop send?
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Login or Sign Up. Logging in Remember me. Log in. Forgot password or user name? Music Electronics Forum. Additional mid control - with drawing, ala Framus Cobra. Posts Latest Activity Photos. Page of 1.
Framus Cobra Tube Replacement
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Framus Cobra Head
Users browsing this forum: Google [Bot] and 2 guests. Posted: Wed Oct 03, pm. Hi everybody, I'm posting here because of a problem happening with my amp, a Framus Cobra w Head. Sincerily this problem begun not too much time after I bought it, let's say more or less one year amp is 5 years old. I first ignored it because I always blamed the genre I was playing fast deathcore and the amount of gain used. Lately during the last year I found myself needing a less extreme sound so I was quite disappointed noticing that even with small gain amounts the problem was still there.
Used Framus Cobra 100 Watt Tube Head
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Framus Cobra WANTED
The ultimate in tonal control, power and versatility. Although it's an EQ tweaker's paradise, the amp sounds fantastic right out of the box! The EQ section is extremely responsive and harmonically rich allows you to accurately tailor and personalize your tone for every channel, from a heavy, chugging mid-scooped drive, to classic, British crunch. This road-worthy amplifier is in excellent condition - fires right up and delivers a proper dose of smooth, bell-like cleans all the way up to a molten-hot drive.
I've not heard better cleans from a high gain head and it gets some seriously crushing rhythm tones. I use the Dragon heads and my other guitarist uses the Cobra The cobra I had was probably the tightest amp on the crunch channel, which isn't really "crunch" that i've ever played. It also has the best clean channel on a high gain head i've heard. Better than my old mark iv and powerball.
Order by:. Available to:. For sale is my Framus Cobra top. The head is absolutely flawless. I have jj tubes throughout. The head is the best I have ever owned period.
Discussion in ' Member Classifieds ' started by diesect , Dec 19, Log in or Sign up. Marshall Amp Forum. Here is a friendly bump for my man Pauly.
Bravo, this magnificent idea is necessary just by the way