Grundig HVS-1 Vintage Germanium Spring Reverb + Matching Mono Mixer – Serviced

Here is a very special piece of German vintage audio history: a Grundig HVS-1 spring reverb unit from the 1960s, together with a matching mono mixer, ready to be used as a standalone studio effect.

The HVS-1 was originally designed by Grundig as a Raumhall-Einrichtung — essentially a dedicated mechanical room-reverb system for their radios, tape machines and stereo/mono equipment. Unlike modern digital reverbs, this is the real thing: a mechanical spring reverb with the unmistakable character, movement and imperfections of vintage hardware.

The HVS-1 uses a multi-spring reverb assembly and discrete germanium transistor electronics. The spring system is suspended to isolate it from mechanical vibration, and the unit can produce up to approximately 2 seconds of natural spring reverb. It is a wonderfully unusual piece of early German audio engineering and, in my opinion, a fantastic studio effect.

THE SOUND

What makes the HVS-1 especially interesting is that it doesn't sound like a modern recreation of a vintage reverb — it actually is vintage.

It can produce beautiful, dense and slightly wild spring reverb, ranging from subtle ambience to very obvious psychedelic/experimental effects. And with the included mixer, you can take the reverb signal completely separately and create a 100% wet reverb output.

I made a YouTube video using this exact HVS-1, demonstrating the unit, so you can hear what this particular unit sounds like in practice.

INCLUDED: MATCHING MONO MIXER

The included mono mixer is in excellent condition and makes the HVS-1 much easier to use as a modern studio effect.

It comes with:

• Original instruction manual (german/english/french)
• Original schematic / circuit diagram
• 3 × DIN-to-¼" jack cable adapters
• Dedicated cable for connecting the HVS-1 to the mixer

One particularly nice feature of the mixer is that it does not require an external power supply for normal mixing operation. The batteries are only used for the microphone-channel amplification. This means you can use the mixer without connecting it to mains power — only the HVS-1 itself needs to be connected to the AC supply.

SERVICED & READY TO USE

Both the HVS-1 and the mixer have received fresh electrolytic capacitors.

So this isn't just a museum piece that has been sitting untouched for decades. The electronics have been serviced and the unit is ready for many more years of use.

The HVS-1 itself was designed to operate from selectable mains voltages (including 110/130/220/240 V), and its original design was intended to be integrated into vintage audio equipment.

A VERY UNUSUAL PIECE OF VINTAGE GEAR

The Grundig HVS-1 is one of those pieces of equipment that sits somewhere between vintage hi-fi, broadcast history and experimental studio gear.

And because you can access the reverb separately, it can be used in a very modern send/return setup, despite being designed more than half a century ago.

If you are looking for another generic spring reverb, there are plenty of those.

If you want a rare piece of 1960s German engineering with a genuinely unique sound, this is something much more interesting.

Included:
Grundig HVS-1 spring reverb
Matching mono mixer
Original manual with schematic
3 × DIN-to-jack adapters
HVS-1 ↔ mixer connection cable

The unit has been serviced with fresh electrolytic capacitors and is ready to make some beautiful noise again.

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