If you want to build a Twin T to this spec:
https://www.youtube.com/watch?v=u4clf4PlP0A&feature=youtu.be
Schematic below. Use 2C=0.0022uf (code 222) and C=0.001uf (code 102). Resistors are 6.8kHz. Wire two together in series to make one R of 13.6kHz (you'll need to do this for each R), and use one alone for R/2. Or find something very close to 13.6kHz for the R resistors.
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Thanks mate.