by Stefan Wyeth | 3,4 / 5,0 | Approximate reading time: 4 Minutes
What makes the Pultec EQ so special?

What makes the Pultec EQ so special?  ·  Source: Maksym Kaharlytskyi / Unsplash

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It’s fair to say the Pultec EQ is a piece of gear that has reached legendary status among engineers, producers, and studio aficionados. There’s no doubt we’ve all heard it on countless recordings in the past 60 years, but what sets it apart from other EQs? We’re here to find out.

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The magic in the design of the Pultec EQ

The original Pultec EQP-1 was designed in the early 1950s by two guys from New Jersey. Eugene Shenk and Ollie Summerlin used a passive EQ circuit with a tube gain stage to compensate for the loss in gain(around 16 dB) common with passive circuitry.

The design of the EQP-1 includes a low-frequency shelving filter with three selectable bands and a high-frequency peaking filter with five bands and variable Q. Each of these two filters has individual parameters for applying gain boosts and cuts, and this is what sets it apart from every other EQ.

Although the manual advised users never to boost and attenuate the same band simultaneously, this ended up being the very feature that made Pultec famous. The uniquely musical frequency contours created from this technique, particularly when dealing with low end, is the reason it is still widely used in music today.

Pultec EQP-1

The original Pultec EQP-1.

How do I get hold of a Pultec EQ?

Luckily, Pultec EQs are one of the most celebrated and widely used studio tools available. As a result, there is a multitude of hardware clones, reissues, 500-series versions, plug-ins, and even guitar pedals that aim to emulate the original sound.

Pultec-style Plug-ins

Plug-ins like the popular Waves PuigTec EQs provide the look and feel of the Pultec EQP-1A and MEQ-5 in software form. Each aspect has been meticulously modeled to give you the closest sound possible to the original vintage hardware.

The obvious advantage of plug-ins is that you have presets and the flexibility of using multiple instances on different channels. Also, the PuigTec EQs have a novel feature that can mimic the way the circuit behaves on 50 or 60 Hz mains.

Overall, taking the plug-in route might give you the original Pultec sound, but it’s a convenient option that comes at a fraction of the cost of hardware.

Waves PuigTec EQs

Waves PuigTec EQs

Waves JJP Analog Legends Download

Waves JJP Analog Legends Download

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(9)

Pultec-style Guitar Pedals

A Pultec guitar pedal you say? Well, not exactly. The ZIO Analog Front End + Boost from Source Audio might not be a completely Pultec-styled processor, but it does have an EQ preset modeled on the famous Pultec low-end EQ technique we mentioned earlier.

It’s a simple pedal with a three-way tone switch and you get four EQ circuits to choose from. The “Studio” circuit will give you some of that Pultec magic on your guitar or bass. In addition, you have control over high-frequencies with the tone selector.

Pedal interfaces generally favour speedy operation. So you get a few switches rather than spending hours dialing in the right setting on rack-mounted hardware. This makes the ZIO a useful choice both for recording and live performance.

Source Audio ZIO Analog Front End + Boost

Source Audio ZIO Analog Front End + Boost

Source Audio SA 271 ZIO Boost

Source Audio SA 271 ZIO Boost

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(3)

Lindell Audio PEQ-501A

500-series modules like the PEQ-501A don’t allow for the same level of high-voltage circuitry as 19-inch rack gear, but you can save plenty of space and money taking this route.

Lindell Audio has reproduced the Pultec program EQ in this compact format. This design is centered around their version of the Melcor 1731 op-amp from many well-known preamps in the 1960s. The PEQ-501A also has stepped rotary controls and additional selectable frequency bands, making it even more versatile in studio.

Remember that this format of modules requires a 500-series chassis for operation, which is an additional expense.

Lindell Audio PEQ-501A

Lindell Audio PEQ-501A

Lindell Audio PEQ-501A

Lindell Audio PEQ-501A

Tube-Tech PE 1C

If you have the budget, nothing beats the dynamic range of high-end analogue gear. The Tube-Tech PE 1C is a European reproduction designed in the 1980s to be every bit as good as the famous Pultec EQP-1.

Apparently, it was first tested for fidelity alongside the original Pultec. While mixing with a unit on each side of the stereo they could analyze the stereo image.

This was the first Tube-Tech product ever released, paving the way for a highly sought-after range of tube-based gear.

Tube-Tech PE 1C

Tube-Tech PE 1C

Tube-Tech PE 1C

Tube-Tech PE 1C

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More about Pultec EQs:

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Image Sources:
  • The original Pultec EQP-1.: Pulse Techniques
  • Waves PuigTec EQs: Waves
  • Source Audio ZIO Analog Front End + Boost: Source Audio
  • Lindell Audio PEQ-501A: Lindell Audio
  • Tube-Tech PE 1C: Tube-Tech
What makes the Pultec EQ so special?

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