UREI 175B
A tube limiter that turns up in studio inventories for decades — usually two at a time.
Overview
The UREI 175B is one of those pieces you learn to recognize from the back of a rack photo before you ever see one in person. It shows up in the outboard lists of working rooms across the 1980s and 1990s, always in the same company: Pultec EQs, Lang tube equalizers, Collins and RCA tube compressors, the 1176 and LA-2A that UREI built its reputation on. In a 1997 EQ studio inventory, the 175B appears twice alongside a pair of Pultec EQP-10S units and a stack of Lang PEQ1s — which tells you what kind of engineer kept them around. This was tube limiting in the classic sense, and it was still earning rack space long after solid-state had taken over the rest of the signal chain.
Owners and collectors describe the 175B as a valve limiter in the old sense — the kind of gain-reduction stage that colors as much as it controls. It's the sort of piece that gets kept for what it does to a signal, not for transparency, and the fact that it stayed in commercial inventories from the late 1970s through the late 1990s suggests the character was worth the maintenance. Tube limiters of this vintage need attention — capacitors, tubes, and the usual age-related service — and the 175B is no exception. Buyers should expect to budget for a tech visit, and should look for units that have been in regular service rather than sitting dormant.
EQ (June 1997, p.29) listed two 175Bs in a studio outboard inventory that also included Pultec EQP-1A and EQP-1AS tube equalizers and Lang PEQ1s — a signal chain built around tube gain stages.
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