Stereoping Spring reverb [duplicate]

Spring reverb amplifier

Our Spring Reverb module is the result of months of research and development to find a universal solution to get any spring reverb tank integrated into the eurorack. We tested it with more than 30 mostly completely different tanks with input impedances from 8 up to 1500 Ohm, output impedances from 500 up to 10 kOhm, input- / output jacks insulated or grounded – up to now, each tank did it.

In spite of all the promises digital technology make us, many musicians and producers still sware on the original spring reverb sound. Unfortunately there is a huge variety of reverb-tanks with different input and output impedances, insulated or grounded input or output jacks. On the other side, the web is full of schematics which are meant to work only with especially this or that sort of tank.

Increasingly uncertain and bugged, we started to build something ‘universal’. The schematics for this module is therefore not developed from ground up. We just experimented with existing schemes, tried to simplify things where possible, added a versatile 4-band equalizer and the result was this Spring Reverb module.

Spring Reverb Features

Universal spring reverb module working with any tank
connection to tank by ordinary cinch-to-cinch stereo audio cable
very small depth of just 35 mm, Width 60 mm / 12 eurorack units
cute aluminium frontpanel with dual color eloxalprint
“Send Level” for adjustable intended distortion of the tank’s input coil
adjustable trimmer on frontpanel to adjust the tanks sonic character (current limiter)
4-Band Equalizer for drastic shaping of the reverb-signals frequency range
Mix from 100% dry up to 100% wet for Send-Return mixer applications
Power-connector compatible to Eurorack-/Doepfer-system
Current draw: +12V 23mA, -12V 23mA
available with a suitable reverb-tank or without
Send Level-pot and ‘Current’-trimmer

The Send Level-pot is responsible for the amplification amount in the unite, driving the tanks input coils. Depending on it’s position, the coils will be overdriven or – if you like – your reverb will sound ‘clean’.

The ‘Current’ trimmer is positioned right in front of the input coil and responsible for limiting the current of the signal going into it. The impact is not really a change in level, it mainly alters the character of the sound. Depending on it’s position, your tank will sound either more silky or more jarring, in extreme position you’ll get heavy distortion. The calibration is in fact just a matter of personal taste.

In tandem, both parameters get the most out of your reverb tank.

4-band equalizer

The 4 band EQ entirely shapes the pure, amplified reverb signal coming out of your tanks output-coils. One might suspect, putting a tone control should be more interesting and more effective on the signal going into the tank. Our research prooved the opposite, therefore it is positioned behind the recovery amp. The EQ has an amplification of +/- 15db and enriches the sonic palette of the reverb module extremely. Most test-tanks did perfect, but some did not show significant changes in sound, when tweaking the Hi-frequency knob. These tanks simply did not transmit much in the high frequencies. Other tanks had an exaggerated bass and could be tweaked to sound more balanced, thanks to the EQ. In any way, it is a charm to explore the sonic ranges of the tank’s reverb and play with distortions on different frequencies by dialing the 4 EQ-knobs.

Connection to the reverb unit

The connection between the tank and the module is accomplished by an ordinary cinch-2-cinch stereo audio cable. Directly on the Spring Reverb modules pcb, we added 2 golden cinch jacks and nearly every tank has the matching connections: cinch-jacks. The position you will put your tank in or on the cabinet might be critical. Sometimes the power supply sends some hum or unwanted noises into your tank, cable or module. The solution is to find another place for the tank (or also the module) in wider distance to the psu.

http://www.stereoping.com/eurorack-spring-reverb/?lang=en