Audio Electrolytic Capacitor 400V 100UF-1000UF Low ESR for HiFi Amplifier

Audio Electrolytic Capacitor — 400V, 100µF–1000µF, Low ESR, HIFI Amplifier

High-performance audio-grade electrolytic capacitors rated at 400V with low ESR (Equivalent Series Resistance) construction, available in capacitance values from 100µF to 1000µF. Designed for use in HIFI amplifier power supply filter stages, where low ESR reduces power supply ripple and improves transient current delivery to the amplifier output stage. The 400V rating provides adequate voltage margin for amplifier power supplies operating from 200–300V DC rails (typical for valve/tube amplifiers and high-voltage solid-state amplifiers). Audio-grade construction minimises dielectric absorption and self-inductance for improved audio performance.

Technical Specifications

Parameter	Value
Rated Voltage	400V DC
Capacitance Range	100µF / 220µF / 470µF / 1000µF
Tolerance	−10% / +20% (M grade, standard for electrolytic)
ESR	Low (audio grade)
Ripple Current	High (audio grade, see datasheet per value)
Operating Temperature	−40°C to +85°C (or +105°C, check variant)
Lifetime	2000–5000 hours at rated temperature
Mounting	Radial leads (through-hole)
Certification	RoHS

Capacitance Selection Guide for Amplifier PSU

Amplifier Power	Recommended Capacitance (per rail)	Notes
Up to 50W	100–220µF	Small valve amplifier, low-power solid-state
50–150W	220–470µF	Medium-power valve or solid-state amplifier
150–300W	470–1000µF	High-power amplifier, parallel capacitor banks

Typical Applications

• Valve / Tube Amplifier PSU: High-voltage filter capacitor in valve amplifier power supply (200–350V DC rail) for ripple reduction and energy storage
• High-Voltage Solid-State Amplifier: Power supply filter capacitor for high-voltage solid-state amplifiers (Quad 405, Naim, etc.) operating from 200–300V DC rails
• Amplifier Restoration: Replace aged or failed electrolytic capacitors in vintage HIFI amplifier power supplies during restoration and recapping
• DIY HIFI: Power supply filter capacitor for DIY HIFI amplifier projects requiring 400V-rated capacitors

FAQ

Q: Why use audio-grade capacitors instead of standard electrolytic capacitors?
A: Audio-grade capacitors are manufactured with tighter tolerances, lower ESR, higher ripple current ratings, and reduced dielectric absorption compared to standard electrolytic capacitors. In amplifier power supplies, lower ESR reduces power supply impedance at audio frequencies, improving bass response and transient performance.

Q: Should I use 400V or 450V capacitors in my amplifier?
A: Use capacitors rated at least 20% above the maximum DC rail voltage. For a 300V DC rail, use 400V capacitors (300 × 1.33 = 400V). For a 350V DC rail, use 450V or 500V capacitors.

Package Contents

• Audio electrolytic capacitor 400V (capacitance as selected)

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