states do not allow limitations on how long an implied warranty lasts, so the above limitations may not apply to you. IN NO EVENT
SHALL WE BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER
WARRANTY EXPRESS OR IMPLIED, WHATSOEVER. Some states do not allow the exclusion or limitation of special, incidental or
consequential damages, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
METASONIX shall not be held liable for any incidental, consequential, or direct damages or expenses associated with the use or
misuse of its products. The audio output of this product is capable of damaging some types of solid-state audio equipment; such
use is entirely at the risk of the user. METASONIX does not guarantee that any of its products are designed for any particular use
or purpose. The entire risk of suitability and performance of this product lies with the user. Products manufactured and/or sold by
METASONIX are not authorized for use as critical components in devices used in life support and other systems whose failure or
performance could result in compromised safety or danger to life or property.
NOTE: All sales are FINAL, especially custom designs. Only a Metasonix authorized dealer is permitted to return products to
Metasonix for a refund or exchange.
What it does:
The RK1 is intended to serve as a “cymbal” sound for synthesis of electronic drums. It uses a special selected noise diode to generate white
noise, and a vacuum-tube pentode to gate the noise on and off. A built-in envelope generator allows adjustment of the attack and decay time.
Long attack times will require triggering with a long positive pulse, while “typical” cymbal sounds can be made with a short trigger pulse. A
trigger of at least +5 volts is recommended for best performance.
Trigger and CV inputs have 100k ohm impedance. The audio output is able to drive a 600-ohm load. The CV input affects the DECAY time,
and may be anywhere in the -10v to +10v range – the effective range is +1.5v to +5v.
USAGE
Connect the RK1 to an adequate Euro cabinet power supply. Connect a positive trigger/gate pulse to the INPUT, and connect the OUTPUT
to a monitor amplifier or mixer. (Watch the volume level! The RK1 is designed to put out a very hot audio signal.) Trigger sequencers such as
the ALM Pamela's Workout, Delptronics Trigger Man, Tiptop Trigger Riot, or the trigger outputs of the Doepfer A-155 sequencer may be used
to trigger the RK1. Most of these devices produce short pulses, so the ATTACK control's range will be limited. (If a wider attack range is
desired, you must use a “pulse stretcher” such as the Doepfer A-162 trigger delay before the RK1. This function is built into the Tiptop Trigger
Riot. See the user manual for whichever sequencer is desired. )
Turn ATTACK, DECAY and TONE fully counterclockwise. Allow the RK1 tube to warm up, then start triggering it. Adjusting DECAY will allow
a full range of ordinary cymbal effects (short decay for ride, medium for hi-hat, long for crash), while ATTACK can offer a slow-attack cymbal
which is normally impossible in real-world drumkits. The TONE control is a simple low-pass filter; fully CCW is “white” noise, and fully
clockwise is “red” noise. Various shades of “Pink” are available, mostly at the clockwise side of the control's rotation (no, it's not linear).
By gating the RK1 on at all times with a DC voltage, it can be used as a conventional white/pink noise source for other modules. It is also
possible to process audio through the RK1; feed a VERY hot audio signal to the Trigger input, turn ATTACK and DECAY fully CCW, and you
should be able to hear the noise signal being gated by the audio signal. Because the signal is very strong and tube “squash” distortion
occurs, the RK1 will NOT sound like a conventional solid-state noise source.
MAINTENANCE
The RK1 requires a power supply producing +12v DC at 800 mA cold, and 300 mA after warmup, plus -12v at 10 mA. When first powered
on, the RK1 briefly draws greater current, so be aware of this when using a power supply to run it plus other modules. You MUST assure the
power supply is able to handle the RK1 load plus the load of other modules. We do not recommend the use of Tiptop microZeus or “Happy
Ending” power supplies, due to their limited peak current capacity. We DO recommend use of the Metasonix RKP power system, which has
ample power capacity to run Metasonix modules.
The tube in the RK1 is being run VERY conservatively. It should last for tens of thousands of hours of normal use. Still, the RK1 produces a
lot of waste heat,
so we recommend shutting it off when not in use.
UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING, DO NOT REPLACE OR SUBSTITUTE THE TUBE YOURSELF!
Please note: not all tubes have easily visible heaters.
They were not designed to offer pretty cosmetics.
If you can't see a heater glowing, DO
NOT assume that tube is bad.
If you hear an output signal, the RK1 tube is working.
We get many foolish complaints of this type!
TUBE REPLACEMENT: despite their expected long lifetime, the tube might be damaged or develop faulty internal wiring connections,
requiring replacement. This particular RK1 was shipped, and wired for, a 6CB6 pentode. Other pentodes with the same pinout, such as the
6AU6 or 6AK5, will also work. Do NOT attempt to substitute other tube types. 6CB6s are still quite easy to find and are available from
distributors such as Radio Electric Supply (vacuumtubes.net) or Antique Electronic Supply
(tubesandmore.com).
If you are confused or have ANY technical questions, feel free to contact us. Please DO NOT ASSUME and
if you are not an
experienced technician,
DO NOT TRY RANDOM TUBES OR MODIFY THE CIRCUIT IN ANY WAY!
495 N. Main #109, LAKEPORT CA 95453 USA
707-263-5343, [email protected], www.metasonix.com
