Spectra 1964 STX 100D
- Classic Spectra Sonics 101 amplifier sound in 500 Series format
- Fully discrete topology for ultra-clean signal path
- Dual 101 amplifier modules for maximum headroom and dynamic range
- US-made input and output transformers ensure accurate harmonic reproduction
- Identical sonic performance to original Spectra Sonics consoles (1964–1971)
- 101 amplifier modules reduced in physical size by over 75% to fit the 500 Series lunchbox, without compromising performance
- Compact single-slot 500 Series design
- Hand-built and tested in Ogden, USA
- Over 95% of components sourced from the USA and Europe
Product information "Spectra 1964 STX 100D"
The Spectra 1964 STX 100D brings the legendary Spectra Sonics amplifier circuit to the modern 500 Series format. Known for powering classic recordings from artists such as ELP, Aerosmith, ZZ Top, Yes, John Lennon, and Aretha Franklin, this amplifier embodies the unmistakable Spectra sound — full harmonic detail, low noise, minimal distortion, and immense headroom.
Based on the original Spectra Sonics console designs from 1964 to 1971, the STX 100D features an all-discrete topology with two 101 amplifier modules and custom US-made input and output transformers. Its compact, single-slot 500 Series design delivers the same sonic integrity as the original Spectra consoles — without the compromises often found in modern lunchbox modules.
Proudly manufactured in the USA, with over 95% of components sourced from US or European suppliers, the STX 100D continues the Spectra legacy of precision engineering and superior audio performance.
Spectra 1964
Spectra 1964
860 W Riverdale Road, Suite D6 Riverdale, Utah 84405 United States
info@spectra1964.com
Gain: 64 dB
Total Harmonic Distortion (THD): Less than 0.03% @ 20 Hz – 20 kHz
Signal-to-Noise Ratio: Better than 120 dB (unweighted)
Maximum Output: +18 dBm, 20 Hz – 20 kHz
Power Requirement: Less than 50 mA, +18 dBm
Input/Output Control: Continuously variable / 3-position pad
Input Impedance: 600 Ohms, nominal
Output Impedance: Less than 50 Ohms
Frequency Response: 10 Hz – 50 kHz
Phantom Power: 48 Volts
Polarity: 180° / Reverse / Mic or Line Input
