Tascam PE-20
Four channels of parametric EQ built as a patchable building block. No switches, no frills, just sweepable tone control you wire up yourself.
Overview
The PE-20 is one quarter of Tascam's System 20, a modular mixing concept covered in contemporary Modern Recording advertising (April 1982, p.81) as a professional-quality four-track recording system built around the MM-20 mixer. Most consoles bury their equalisation inside a fixed signal path. Tascam broke the mixer into separate boxes - a master module, an input expander, a meter bridge, and this parametric EQ unit - and let the user patch them together in whatever arrangement the session demanded. The PE-20's job is straightforward: four identical channels of three-band parametric equalisation, designed to be inserted between the send and receive sockets fitted to each input channel on the MM-20 master module and EX-20 expander.
The architecture is the interesting part. Each of the four channels offers up to 12dB of cut or boost at each centre frequency. The low band sweeps continuously from 60Hz to 1.5kHz, the midrange covers 1.5kHz to 8kHz, and the high-frequency section is fixed at 10kHz. That fixed top band is the one compromise in an otherwise flexible design. There is no shelving control and no sweep up top. For the home recordist working with a four-track machine, the sweepable low and mid bands cover the ground that matters most: taming boom on acoustic guitars, carving mud out of drum overheads, finding the sweet spot on a vocal. Contemporary Modern Recording coverage of the System 20 (April 1982, p.81) described the modular approach, with the MM-20 forming the heart of a professional-quality four-track recording system and additional Series 20 components patched in as needed, including a meter bridge with VU-type meters.
The PE-20 was never meant to sit in a rack on its own. It slots into the System 20's patch-bay logic, where the user decides what gets equalised and where. Tascam's US marketing manager Dave Oren, quoted in the contemporary press, framed the whole system's appeal around "the uniqueness of the system is in its absence of switches". That trades convenience for patching flexibility. The PE-20 has no bypass buttons and no routing switches, just four channels of EQ to be wired between whatever send and return points the user chooses.
Cosmetically, the System 20 modules look a lot like the Model 144 Portastudio, with similar dimensions and weight and the same style of knobs and faders. The PE-20 shares that utilitarian look. A 1984 Mix classified listing for a full Teac package - MM-20, two EX-20s, a PE-20, and an MU-20 with patchbay and cabling - priced the whole lot at $6,000, which gives some sense of what a complete system commanded on the used market even a few years after its introduction.
The PE-20's place in recording history is modest but specific. It was part of Tascam's push to make modular, patch-based recording accessible to the semiprofessional and home enthusiast — the same market the Portastudio served, but with a more flexible, build-your-own-console approach. The fixed 10kHz high band limits its usefulness on brighter sources, and the lack of bypass switching means the unit is always in the path when patched — but for the price and the format, it delivered exactly what the System 20 concept promised: parametric control that went where you needed it.
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