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Ceriatone / Overtone / Re: Dumbleator in Parallel mode
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on: December 24, 2009, 01:06:41 AM
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Hi Blues, Great thinking!
I have one question; why is the direct signal, in parallel mode, fed directly to the grid?
I think the NFB is part of the smooth factor. In parallel mode only the fx signal is affected with NFB.
What are your thoughts about this?
Happy X-mas,
Erwin
You're right - have updated the Schemo....comments please |
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242
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Ceriatone / Overtone / Re: Dumbleator in Parallel mode
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on: December 23, 2009, 01:20:12 PM
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Hi I have thought about this. My reverb has an internal mixer so the dry signal stays analog. Nonetheless series operation would be even better I think. But what happens when you use a chorus? For an optimal chorus sound the whole signal should pass through it right? besides some people think the fx loop makes the sound of the amp nicer. What are your views? Greets Srteven Chorus wise I have an old TC chorus, which works fin in parallel mode in my loop. Regarding the sound of the loop. The sound is intact, it's only a matter of where you do the mixing ...in the effect like you and RobbenFor d do (  ) or in the Dumbleator in parallel mode. However, my opinion is that you should choose the operation mode and setup, that gives you the sounds you like - let your ears be the judge. |
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244
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Ceriatone / Overtone / Dumbleator in Parallel mode
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on: December 23, 2009, 10:54:49 AM
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I'd like to share my version of the Dumbleator, which has a switch for parallel operation. It's not rocket science, but a simple design.
The difference between serail mode versus parallel mode has been debated often, and my purpose is to share info and ideas, not to argue for one over the other.
Serial mode: An 'ordinary' dumbleator run the effect in serail mode and mix the relationship between direct signal an effected signal in the effects unit. This is the classic operation as used by Robben Ford, and since the TC2290 has an analog signal patch for the direct signal, you dont' degrade your signal.
Parallel mode If you don't have a fine apperatus like the 2290 and like me use simple delay pedals, you might consider parallel operation, in which case you mix the direct/effects ratio in the dumbleator instead of in the effects unit.
Difference between this design and the 'original' dumbleator:
- all I did was adding a 220k serial resistor and 'moving' the return volume from after V1b to before V1b. Hereto adding a small capacitor compensating for the lack of high end loss, from not having the direct signal travelling through feets of cable. You can off course leave that out if you want to preserve high end.
- The cathode resistor combo on V1a can be either 27K/1.8K or 10K/1.5K as per the 'official' schematic.
- I left out the bright switches - never use them.
The return pot is 'master volume', when used in serail operation and 'mix control' when used in parallel mode.
If the direct signal is too hot in parallel mode, put a trimpot or ordinary pot in instead of the 220K output resister.
Hope this schemo might be usefull to DIY'ers with who want to try parallel operation. All it takes is adding a DPDT switch (or converting one of the bright switches) plus a resistor and a pot change place in the circuit.
It's a simple modification to a fine design. Enjoy
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246
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Ceriatone / Overtone / Re: The mystery of the 'pedal' and 'manual' switches
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on: December 13, 2009, 11:21:07 PM
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Okay, I just tried and without pedal attached, putting the PAB switch to manual engages the PAB  and putting it to pedal disengages. However, the switch for the OD works the other way around and I am not sure I understand? Switching to manual without pedal disengages the OD channel and switching to pedal engages. Did I miswire anything or is this the way it should be? Just trying to understand what's going on with those 2 switches You are absolutely right. The OD relay is wired 'wrong' in the Ceriatone. It's not a big deal...but the relay should be on when its off, in order to get the switch on the back to function like the PAB ditto. However, it abviously has no impact on sound. So just forget about it. |
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248
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Ceriatone / Overtone / Re: The mystery of the 'pedal' and 'manual' switches
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on: December 13, 2009, 06:02:11 PM
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For starters the 2 switches on the back.
From a user's point of view: what's the use of these switches? Why would anyone ever set them to manual as there's no way to manually switch the channels or the boost? What's the point?
If the pedal is not connected, you can turn on the od by switching to 'manual' same with PAB. However, I don't use the switches at all. Guess they are on the back because thats what Dumble did.. Technically: I see a difference between the pics on Ceriatone's website (pics of completed amp) and the layout there. I am not sure if it is important as I don't know the reason for the caps that are mounted (differently) to the switches. What do they do?
Que? |
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249
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Ceriatone / Overtone / Re: Kleinulator mods = Dumblator??
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on: December 08, 2009, 03:15:58 PM
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To be honest, I've been using T.C. Nova Delay with my OTS for a long time, because it fits into the loop without any add-on boxes. The sound is OK, but it's not very user friendly. The SDE-3000 has a solid button for every function and despite it's age, it sounds terrific. Not to mention, it's also "period correct" with the early 80's -style OTS I also have a Nova Delay, which I cant get to work in the OTS' loop without a kleinulator/Dumbleator. I sounds 'hollow' for lack of a better word direct in the loop. I have followed the input adjustment procedure as per the manual, but without much success. However, with the Klein, it sounds nice an 2290'esh |
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250
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Ceriatone / Overtone / Re: Kleinulator mods = Dumblator??
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on: December 08, 2009, 01:09:36 PM
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Many thanks for the schematics bluesfendermanblues! Looking back, it shoud have been perfectly clear - LNF = Local Negative Feedback. I'm planning to build a Kleinulator during the Christmas break (your mods included). All this trouble only because of Roland SDE-3000 rack delay  Great, that you can use the mods - all l really did was to make to Klein-ulator more like the original dumblator only in FET version. I don't know why Klein left out the LNF and the extra caps that the real one have, but I find the with the mods the sound compresses nicely like the real one. Nice that you are loyal to your old SDE, why change if it sounds good. I recommend running the Klien in parallel mode as opposed to serial mode like the original dumblator, in order not to degrade your signal through the SDE3000's old converters. Use it 100% wet and in parallelmode |
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251
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Ceriatone / Overtone / Re: Kleinulator mods = Dumblator??
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on: December 08, 2009, 08:56:02 AM
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where and how these components (10M, 220n, 10M) are supposed to be 1) laid out 2) in relation to the FET2?
Ok, got you I have done it as per the attached schemo |
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254
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Ceriatone / Overtone / Re: Ethos overdrive
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on: December 01, 2009, 09:06:39 AM
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I haven't heard the Ethos, but I've got a Zendrive pedal, which sounds great at the rehersal room through a Hughes & Kettner Reverb Road 100 on a neutral setting. Its a neat substitute, when I can't bring my OTS. Highly recommended.
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