Vinyl's continuing demise means sustained interest in passive pre-amps, as more and more of you move over to line-level-only systems. I've got nothing against passives, other than that I tire of reminding people that they are not substitutes for 'active' pre-amps unless you're using a system with short cable runs between pre-amp and power amp.

Only then can you consider this hi-fi oddity which does away with power supplies (bye-bye, noise) and whole metres of wiring and circuitry (hello, transparency). It cannot amplify; it can only attenuate what's fed into it. Passive pre-amps, therefore, are as restrictive as a learner's permit on the M25. But if you fit the bill -- line-level sources and short cable runs -- passives can transform your system.

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The best passive pre-amps appear to have nothing inside, with even an electronics dolt like myself being able to follow the signal's path. What distinguishes the good from the bad is -- almost entirely -- the quality of the parts.

It explains why such stellar passives as the First Sound and the Mod Quad Line Drive cost as much as high-end active pre-amps despite the cost savings which occurs when you chuck out all the other bits. Cost-no-object sockets, source selectors and volume controls, exotic materials, expensive shielding techniques -- these combine to make a shell filled with passive components something of a bargain even when the prices exceed #1000.

The biggest expenditure, the money needed to turn what is basically a stand-alone volume control into the key to the highway, is the volume control itself. This is the junction which can butcher or bless that fragile signal, and there's a world of difference between a #5 potentiometer and a stepped attenuator of the Ben Duncan variety with its #200 sticker price.

What Rothwell Electronics is attempting to do with the Rothwell Passive Pre-Amp is to offer not just a British-made passive at a sensible price, but one which does the impossible: it contains a true stepped attenuator despite a price of #199. Suspicious? So was I, because -- unlike the retail prices of petrol or CDs in the USA or Japanese goods around the world -- UK-made specialist hi-fi is not subsidized.

The Rothwell is tiny, a 65x220x130mm (HWD) box, nicely finished, sporting four rotary controls. It takes up little space, sits on a wooden plinth, weighs only 850g and would go unnoticed in a shop filled with Levinsons, Krells and the like. The back sports pukka gold-plated sockets for all inputs and outputs, so nothing here suggests 'cheap'. The controls deal with choosing between six inputs (one labelled phono to accept an outboard RIAA pre-amp) and choosing tape or source, with two rotaries controlling volume.

Why two? Because one stepped attenuator capable of dealing with volume control in fine enough steps would be too expensive (and probably too large) to fit in under the price ceiling. So Rothwell used a bit of lateral thinking by fitting two stepped attenuators, one dealing with coarse adjustment and the other for fine adjustment. The former offers 12 steps, the latter six, and the company's maths say that this is equivalent to a 67-way switch-plus-full-mute.

Read more about the Rothwell preamp on Page 2.