Electronic components including HC‑5.1 microphone capsule, transformer with wires, foam pad, and capacitor arranged on a light background.
Electronic components including HC‑5.1 microphone capsule, transformer with wires, foam pad, and capacitor arranged on a light background.
Heil Sound 5.1 Retro Fit Kit with HC‑5.1 microphone element, transformer, capacitor, and earpad for upgrading vintage microphones like D‑104 and 444.
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Electronic components including HC‑5.1 microphone capsule, transformer with wires, foam pad, and capacitor arranged on a light background.
Heil Sound 5.1 Retro Fit Kit with HC‑5.1 microphone element, transformer, capacitor, and earpad for upgrading vintage microphones like D‑104 and 444.

Heil Sound – High-Quality Headsets & Microphones

Heil Sound 5.1 Retro Fit Kit with Transformer – Upgrade for Vintage Microphones

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£69.95
(£58.29 exc. VAT)
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Product code: HC-5-1
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Item CostFinance OptionDepositMonthly PaymentsTotal Cost
£69.95
12 Months 14.9% APR
£6.99
£6.03
£79.33
£69.95
18 Months 14.9% APR
£6.99
£4.02
£79.33
£69.95
24 Months 14.9% APR
£6.99
£3.01
£79.33
£69.95
36 Months 14.9% APR
£6.99
£2.01
£79.33
£69.95
48 Months 14.9% APR
£6.99
£1.51
£79.33
£69.95
12 Months 19.5% APR
£6.99
£6.27
£82.22
£69.95
18 Months 19.5% APR
£6.99
£4.18
£82.22
£69.95
24 Months 19.5% APR
£6.99
£3.13
£82.22
£69.95
36 Months 19.5% APR
£6.99
£2.09
£82.22
£69.95
48 Months 19.5% APR
£6.99
£1.57
£82.22

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Electronic components including HC‑5.1 microphone capsule, transformer with wires, foam pad, and capacitor arranged on a light background.

Heil Sound 5.1 Retro Fit Kit with Transformer – Upgrade for Vintage Microphones


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The Heil Sound 5.1 Retro Fit Kit is a versatile solution for upgrading classic microphones such as the D‑104, 444, and other vintage models. This comprehensive kit includes the Heil HC‑5.1 Microphone Element Conversion Kit, featuring:

  • HC‑5.1 microphone element

  • Transformer for easy integration

  • Capacitor for optimal performance

  • Earpad for precise centring of the element

Explicitly designed for retrofitting older microphones, the HC‑5.1 Conversion Kit delivers improved sound quality, enhanced clarity, and compatibility with modern audio setups. The included transformer and capacitor ensure seamless operation across a range of vintage mic designs, while the centring earpad supports accurate element placement for consistent audio capture.

Whether you're restoring a D‑104, 444, or similar legacy microphone, the Heil Sound 5.1 Retro Fit Kit offers a reliable upgrade path—revitalising your equipment with modern components and performance that meets today’s amateur radio standards.

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