Heil Sound HM88 Mixer 1972 - Purple / Blue

🎛️ For sale: a Heil Sound HM-88, a rare early-1970s fully discrete analog mixer from Heil’s first generation of professional audio equipment. This is an unpowered mixer (line-level outputs only), designed for use with external amplification or recording gear.

🔧 The HM-88 features a fully discrete transistor signal path throughout — no ICs or op-amps — reflecting early professional analog design priorities: simplicity, serviceability, and character.

⭐ Highlights

• 🔌 Fully discrete analog mixer — no integrated circuits
• 🧩 8 modular plug-in channels
• 🎙️ Balanced XLR mic inputs + unbalanced 1/4″ inputs
• 🎚️ 3-position input pad per channel
• 🎛️ Two-band shelving EQ per channel
• 🔁 Monitor & aux sends with pre/post switching and concentric controls
• 📊 Master section with line drivers and electronic crossover
• 👀 Large VU meter for output level monitoring
• ⚡ Internal linear power supply
• 🔌 Standard IEC power inlet (requires a standard IEC power cord)

🧪 Condition

• ✅ Fully functional and tested
• 🔄 Pots and switches operate properly
• 🧬 Original, unmodified circuitry
• 🕰️ Cosmetic condition consistent with age

🧠 Why This Mixer Is Different

The HM-88 predates the later HM-1000 and represents Heil’s earliest fully discrete mixer architecture. It’s increasingly hard to find and appeals to users who value simple analog topology, modular construction, and vintage character over modern feature density.

🎚️ Well Suited For

• 🎼 Analog summing
• 🎚️ Submixing
• 🔀 Alternative routing
• 🛠️ Mod-friendly applications (direct outputs, alternate interfacing, etc.)
• 🏛️ Vintage-correct studio setups
• 📦 Collectors of early professional audio gear

📦 Included

• ✔️ Heil Sound HM-88 mixer
• ✔️ Original case cover

🚚 Ships insured through Reverb.

🧰 Optional Service (added at purchase): Power supply recap, channel recap, or full recap (power supply + all channels). Service performed only upon buyer request; pricing varies by scope.