Erhard Audio Nina II - Tape Pre-Amp

Nina is a tube tape head preamp using the excellent 6922/E88CC family triode and is designed for use with most reel to reel tape decks, consumer or pro.

The preamp circuit is a ground up design by our partner, the renowned tube circuit guru Ray Waters. His brilliant circuit has been mated with our in-house designed regulated solid state power supply.
The result is a fantastic sounding tape head preamp that is able to work with a wide range of playback head impedances.
The VU meters areion calibrated to +3dB @ 0dB VU. This can also be calibrated to +6dB @ 0dB VU on request.
To eliminate hum and other unwanted background noise, the preamp has a gain of 38dB. We use a  pair of Lundahl LL1926 SUT at the inputs to increase the input signal level, so that Nina's gain is 55dB.
Input impedance can be varied between 30K and 92K, via a trimmer, depending on the tape head. We set it to 47K unless otherwise requested.
Another unique feature of this design is that Nina can be switched between NAB (7.5 & 15 IPS), IEC 7.5IPS and IEC 15IPS. Or, Nina can be built for IEC only, 7.5, 15 & 30IPS, NO NAB.