1959 Klemt Echolette NG51 Preamp and Tape Delay into vintage and rare M40 Tube Amp - Germany - Fender Bassman depth and Dumble-style Overdrive (SRV, Jimi Hendrix, John Mayer, etc.)

This NAM capture documents a complete German tube signal chain built around a 1959 Klemt Echolette NG51 tube preamp and tape delay feeding directly into a Klemt Echolette M40 tube power amplifier. Both units were designed in Germany at the end of the 1950s for professional PA, broadcast, and studio applications, with a strong emphasis on headroom, clarity, and dynamic response rather than guitar-specific distortion. The Echolette NG51 is a combined tube preamp and tape delay unit. For this capture, the delay is disengaged, but the tape circuitry remains part of the signal topology and contributes to the overall behavior of the preamp. The unit is fitted with two ECC82 tubes in the preamp stages and three ECC83 tubes handling gain and EQ duties. A Telefunken EM84 magic eye is present as a visual level indicator only. The tape delay normally runs on 1/4 inch Scotch Superlife magnetic tape. The NG51 is inherently bright, extremely sensitive to input level, and highly reactive to EQ interaction, which is where much of its character resides. The Echolette M40 is used strictly as a tube power amplifier. It is equipped with five Reflektor 6N2P-EV preamp tubes, four EL84 power tubes, and EZ81 rectification. In this role, the M40 provides strong headroom, fast transient response, and a wide low end while faithfully translating the harmonic content generated by the NG51. The capture path is simple and direct, preamp into power amp, with no additional processing. All gain and volume controls on both units are set to five. The initial intention was to provide three captures, clean, overdriven, and fully cranked. Due to acceptable ESR ratios and the inherently wild and noisy nature of both the NG51 and M40, only one capture could be retained. The final result sits in a controlled, slightly overdriven zone that best represents the pairing while remaining stable and usable. Tonally, this capture sits between familiar reference points. It combines the deep, wide, piano-like low end and openness associated with a classic Fender Bassman with the compressed, harmonically rich midrange and sustain often associated with Dumble-style overdrive circuits. Think SRV on Texas Flood and Hendrix on the extended studio version of Voodoo Chile. Because the pairing produces a strong and authoritative low end, it is recommended to pair this NAM with a bass-shy IR to prevent low-frequency buildup and preserve clarity. This capture is provided for non commercial use only.