Air Tight ATC-1 Preamplifier features:
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Highly reliable 12AX7 valves meticulously selected after ageing
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3-stage low-impedance K-K-NF configuration equalizer acclaimed for low distortion and wide frequency response
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Simple, single-stage flat amp for pure sound
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High-voltage B-power supply with quick recovery diode
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PCB-free hand wiring
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Discrete, highly rigid dia-magnetic chassis
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EL-core power transformer
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