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== Replacing the Doepfer A-199 spring tank ==
The
The two most important ones are the input and output [[impedance]]s, and any replacement should try and match these two closely in order that the circuit functions as originally intended (different input impedances have different input drive level requirements, so if one of a different impedance is used, the tank may be either under- or overdriven, most likely resulting in poor performance, either a weedy signal and/or [[distortion]] of some type).
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==References==
==External links==
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Take care with some of these: some will be designed to interface to guitar-level signals (I'm guessing tens to hundreds of ''millivolts''?), and so may need re-scaling for use with general synthesizer-level signals of ''volts'' up to ''10 volts'' or more! It is also possible some use obsolete or hard-to-source parts!
*Useful [http://www.accutronicsreverb.com/main/?skin=sub05_08.html application notes] at the Accutronics site.
*A couple of simple and more complex circuits [http://sound.westhost.com/project34.htm Spring Reverb Unit For Guitar or Keyboards]
*Scan of a [http://vintageradio.me.uk/electronics/reverb72.htm Practical Wireless article] from 1972
*[https://web.archive.org/web/20130421035909/http://homepage.ntlworld.com/henry01/spring_reverb/spring_reverb.htm Triple Spring Reverberation Unit], a more involved circuit using ''three'' tanks.
*
*The [http://www.tellun.com/motm/diy/tln156/TLN-156.html Tellun Neural Agonizer] which uses two tanks
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