VTSP-1A/166 (Extended Range)
Vacuum Tube Stereo Preamplifier
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 front panel  rear panel |
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Design Considerations
- Perfect tracking volume 166-step control system with unprecedented precision and dynamic range
- Infinite resolution indirect signal path balance control
- All-tube design operated conservatively for long life
- Relay input switching eliminates switching distortion
- Star grounding for low interference susceptibility and clean signal path
- Zero feedback - no feedback loops in the audio circuitry
- Super-low noise
- High input signal capacity without overload; see technical specifications
- Gold plated TIFF RCA and ground connectors
- Hand-picked components for accurate response and consistent unit-to-unit quality
- Automatic muting at startup and shutdown
- 72,000 µF of power supply energy storage capacitance
- 4 levels of high voltage regulation
- Regulated soft-start DC filament supply
- Regulated tube bias supply
- Toroidal power transformer
- Rugged 0.10" thick aluminum chassis with 0.25" thick heavily anodized faceplate
- Reversing power line (AC) polarity switch for minimizing line-to-chassis reactive currents and noise pickup
- Controlled warm-up of tube filaments and high voltage for extended tube life
- Low plate operating currents for extended tube life and cool operation
- Front panel indicators for power, filament voltage, and output/mute/monaural
- Each unit is given an extensive burn-in, including rigorous bench and listening tests
| Specifications | |
|---|---|
| Tube complement | 4 x 6922 |
| Frequency response | 1 Hz to beyond 100 kHz, 20 Hz to 20 kHz ±0.1 dB (volume control at 9 o'clock) |
| Volume Control | 166-position electronic stepped attenuator |
| Volume Tracking | Maximum differential: ±0.1 dB channel to channel |
| Output impedance | 100 Ohms nominal at 1 kHz |
| Input impedance | 100,000 ohms |
| Power supply | 72,000 µF of energy storage 4 levels of high voltage regulation Regulated soft start DC filament supply Regulated tube bias supply Toroidal power transformer |
| Power requirements | U.S.: 120 VAC 60 Hz, 30 VA, Fuse 1/2 amp 250 volt slow blow Export: 230 VAC 50/60 Hz, 30 VA, Fuse 1/4 amp 250 volt slow blow |
| Input capacity | 18 Volts RMS |
| Overall dimensions | 19" wide x 3.5" high x 10" deep |
| Warranty | 3 years, parts and labor Tubes: 90 days |
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Herron Audio, div. of Herron Engineering, Inc.
