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RK3 and RK4
MUFF WIGGLER Forum Index -> Metasonix Goto page Previous  1, 2 [all]
Author RK3 and RK4
ritchiedrums
SlayerBadger! SlayerBadger! SlayerBadger! The Agonizer!
Kujo
I'll be in Murica next month and plan on grabbing one RK4 and one RK2 SlayerBadger! , I hope my SILTA PSU's are up to the task.
Kujo
fukit ordered the RK4 from escape from noise.
Kujo
I'm running my 9U system on 3x Silta (http://frap.tools/portfolio/silta/#1483890593510-9600f0d3-6947) 1 for each row of 84HP .

The RK4 was used on the same row as other modules drawing about 266mA on +12 and about 145mA @ -12vin total so the RK4 had about 950mA spare for itself @ +12 . the power up happened with no issue whatsoever everything got fired up nicely!
metasonix
Review of RK4 for Polish magazine, you tell me what it says.....

Yes Powder
Because I was bored, I ran it through Google Translate.

Quote:
With the Californian modulators of Metasonix there is no more aggressive and unreliable sound. In the end this is the lamp of the top shelf. However, the tone of the sound is not limited to the euro. Before you spend a fat hick on RK4, take note that this mastiff needs a big shack. On a good day RK4 will get 450mA of current, and at system startup, for a few seconds it requires at least double the supply of this demand. This means that you have to book for about 1A of electricity in your housing. But the game is worth the candle. This is because there is an oscillator and cone filter in one. When no signal is connected to the ln socket. RK4 behaves like an oscillator. Tuning knob is responsible for the amount of sound generated, and Resonance changes the shape of the pure sinusoid waveform to more angular waves, rich in harmonic. When we connect the signal to the socket, the module converts to a BP filter. In this case, Tuning controls the filter shedding, and Resonance decides how shaky, kicking and rampant venom will be RK4. It is unbelievable how many shades of distortion and aggression can be squeezed out of such seemingly simple construction. Especially if you use the CV socket for modulation, it freed up the frequency. Here's an important note - if you want to call RK4 as a typical oscillator, you'll have to use a Hz / V (Harvestman English Tear) module to control it. As is the case with the tube modules, the key to success is the the minimal flare movement. Even minor manipulations lead to drastic changes in the sound. And this lamp is proudly proud of all the modules.
metasonix
Quote:
Before you spend a fat hick on RK4, take note that this mastiff needs a big shack.

Thasright. No pussies.
FatRocky
metasonix wrote:
Review of RK4 for Polish magazine, you tell me what it says.....




here´s the video!

https://www.youtube.com/watch?v=Pq_2r_rKY3E
metasonix
And here's the English version:
evs
albiedamned wrote:
metasonix wrote:
It's about 2.5 times the operating current; it varies slightly from tube to tube so we can't make it a "rating". I doubt the Doepfer PSU3 will have a problem running that load.


Actually the PSU3 will have problems. I got a reply from Doepfer, from Dieter Doepfer himself. Here's what he wrote:

Quote:
as the A-100PSU3 is made of a switching supply (followed by linear
regulation) it's not possible to obtain inrush currents beyond the specs of
the power supply. We know this as there are e.g. problems with the new
digital Roland modules which consume high inrush currents during power on.
The A-100PSU3 should be more than sufficient to drive these modules based on
the current specifications. But the PSU3 does not turn on when more than 3
Roland modules are connected. These should take only about 3*450mA = 1350mA.
But they obviously consume more than these currents during power on. On has
to connect one module after the other to the PSU3. Then it does work but
that's not a practibal solution.
I'd recommend to keep the A-100PSU2.


So the PSU3 can't handle inrush draws that push it beyond it's total rating of 2000 mA +12V and 1200 mA -12V. I know you said 2.5x is not an exact thing, but let's just use it for an example. An RK3 and an RK4, at 400 mA +12V each, would combine to require all 2000 mA of +12V for their inrush current draw. You wouldn't be able to connect a single additional module to the PSU3.

Dieter says to keep the PSU2, which is linear. But it's total capacity is only 1200 mA of +12V. So it's a trade-off: higher total capacity with no ability to handle inrush (PSU3), or lower total capacity with ability to handle inrush (PSU2).

I know what the correct answer to the problem is: RKP.


anyone knows which other power can handle inrush draws?

i have a psu3, and a row power 40.. guess the latter can not do it either. or anyone tried it?

edit: just read on the page that you should not use 4ms power for tube modules.. allright, shit.
i have all the power i need until now. the 4ms is in my portable case, so i don´t want to have something big in there.
maybe i need to keep my doepfer diy power...
nearly ghost
metasonix wrote:
The RK4 circuit is identical to the D-2000 circuits. Yes it can be used as a pitched drum voice.

Two RK1s and three RK4s and a controller or sequencer and you have a D-2000. Wazoo.


So do you just hit the audio in with a trigger or gate for percussive sounds like the D machines?
Yes Powder
nearly ghost wrote:
So do you just hit the audio in with a trigger or gate for percussive sounds like the D machines?

Yep, pretty much. Shorter triggers tend to be better, otherwise you'll get a sort of double-hit effect— unless you're going for that.
defenestration
spent some focused and directed time with my new RK4 instead of just smashing it around and going crazy hyper

[bandcamp width=100% height=42 track=41591023 size=small bgcol=ffffff linkcol=0687f5]

patch notes:

mostly exponential Maths envelope with self-feedback to RK4 pitch CV, RK4 out to Optomix, Optomix out to Double Andore in. DA env out to optomix CV, DA set to exponential response
metasonix
RK3 and other processing by Ethan. "All sounds are produced from a WMD/SSF Spectrum, Qu-Bit EON, or A-196 PLL through the RK3, before entering an A-101-2v LPG and Pico DSP. The signal output was ran through a Grace M103 PreAmp/Compressor before recording. No post-production editing was done to this recording."

https://soundcloud.com/delepathy/metasonix-rk3-ringershaper-demo-1
nearly ghost
Yes Powder wrote:
nearly ghost wrote:
So do you just hit the audio in with a trigger or gate for percussive sounds like the D machines?

Yep, pretty much. Shorter triggers tend to be better, otherwise you'll get a sort of double-hit effect— unless you're going for that.


That's great to hear thanks.
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