Schematics are available online but I think I have a paper copy that I may be able to find. The item "RFZ V781 German Dual Mic Pre And Tails. Neve API Telefunken Siemens TAB" is in sale since Thursday, October 05, 2017. This item is in the category "Musical Instruments\Pro Audio Equipment\Preamps".
The seller is "drommen" and is located in Virginia Water. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Russian federation, Canada, Brazil, Japan, New Zealand, China, Israel, Hong Kong, Norway, Malaysia, Mexico, Singapore, South Korea, Switzerland, Thailand.