We’re pretty FULL on stereo gear, HOWEVER, MAY ALSO BE TAKING IN ON TRADE VINTAGE / OLDER TRADE-IN Trade-in / Gear Swap page for older / vintage stereo gear / equipment, musical instruments such as guitars and guitar related items, metal detectors, utility trailers. TRADING / TRADE-IN YOUR OLD STEREO GEAR / AUDIO EQUIPMENT / GUITARS / MUSICAL INSTRUMENTS / TEST EQUIPMENT / ELECTRONIC GEAR.The KBPF3A option extends receive coverage down to 100 kHz, covers all SWL bands, and allows 0.5 mW transmit output on the 472 kHz (630 m) band for use with external amplifiers. DSP, low-noise synthesizer, and up to five crystal roofing filters. Each receiver has its own bus-switching mixer, narrow ham-band front-end filters, 32-bit I.F.Schematics (without the 12 volt regulator on the secondary side, labelled 'OUT'). The small PCB on the right side contains a rectifier, and (added later) a 12 Volt regulator IC for the output voltage, feeding the VLF receiver.This process can take up to 60 minutes.If you're using the software installed by the factory (v1.2) you may not hear audio due to recent browser changes preventing the autoplay of audio and video. Be sure to initially give your Kiwi a connection to the Internet and let it update to the latest software release.I would appreciate any leads to a schematic / manual.

I have searched for a manual, but have been unsuccessful. Scan function is intermittent, and it sometimes locks up on a frequency. Although partially working, it could use a tune up.

A long while back, I picked up this VLF receiver.

Simple vlf receiver circuit