The forgotten effect that defined classic rock

I’ve been playing guitar for almost three decades now. And writing about pedals for years.

So, you probably won’t believe this…

Until last week, I couldn’t have told you what a treble booster actually does.

I was about to run away and hide myself with shame. When I realised I wasn’t alone.

In fact…

It turns out, neither can most guitarists.

And that’s a shame.

Because this tiny circuit shaped the sound of half the records I grew up on.

Here’s what got me thinking about it.

Vox just released a pedal called the VTB-1. A treble booster.

Not a fuzz, not an overdrive, not a modelling unit with 400 presets.

A treble booster. One knob. One switch.

I hadn’t seen a major brand release a treble booster in years. So I did what I always do when something catches me off guard.

I started to research.

The story starts in 1965. Or it might be 1966, depending on who you ask.

A company called Dallas Musical in London built a little box called the Rangemaster.

It wasn’t a pedal. It was meant to sit on top of your amp.

Inside? A single germanium transistor and a handful of components. Nine, to be exact, including the potentiometer.

That’s it. The whole circuit fits on a scrap of paper.

But here’s what surprised me.

Despite the name, a treble booster doesn’t just boost treble.

It cuts low-end mud, pushes the mids and upper mids, and drives your amp’s preamp stage harder.

It changes how your amp distorts. Not how much. How.

That’s a completely different thing from an overdrive pedal or a clean boost.

The Rangemaster was built to solve a specific problem.

British amps in the 1960s. Vox AC30s, Marshall JTM45s. Beautiful amps, but when you cranked them, they got dark and muddy.

The Rangemaster cut through that mud and pushed the amp into this focused, singing overdrive that nothing else could quite replicate.

And the guitarists who figured this out?

Tony Iommi used one to record “Iron Man” and “Paranoid.” The riffs that basically invented heavy metal came through a treble booster into a cranked amp.

In 1979, a guy he’d hired to rebuild his amps found the Rangemaster and threw it away. (I’d be fuming.) Nobody had ever checked what modifications had been made to it. Iommi’s never been able to reproduce it.

Brian May used one with Queen from the very beginning. His was lost when a roadie left it behind at a gig, sometime around 1973. (I’m starting to sense a pattern here.) When May asked where it was, the roadie apparently said he “didn’t think it did very much.”

Rory Gallagher ran his Rangemaster into the normal channel of his AC30. Not the bright channel. The normal one. He let the booster do the work, and got that raw, cutting tone without any fizz.

These aren’t obscure players.

This is the Mount Rushmore of British guitar tone.

And they all relied on the same simple, forgotten tool.

So why did treble boosters disappear?

It seems they got replaced.

Once overdrive pedals and high-gain amps became common in the 1980s, guitarists didn’t need a box to push their amp into breakup anymore.

The amp did it on its own. And the treble booster quietly faded out.

But a treble booster doesn’t work like any pedal on my board.

It’s designed to be left on.

Always on.

You don’t stomp it for a solo and stomp it off for the verse. You leave it running and use your guitar’s volume knob to control everything.

Volume at 3 or 4? Clean.

Volume at 6 or 7? Rhythm crunch.

Full up? Lead.

Three “channels” from one pedal. No tap dancing. No switching. Just your hands.

That’s the opposite of how most of us use our pedalboards.

We stomp on, stomp off, add this, remove that.

The treble booster guys had a different philosophy entirely. One box. One knob. And then they played.

If you’ve been reading Pedal Talk a while, you’ll know that I’m really into this idea.

We’ve spent years adding pedals for different sounds.

Maybe the guitarists who shaped the sound of classic rock had a simpler idea. One box that makes your amp respond to your touch.

Not more gear. More dynamics.

If you want to try a treble booster, here’s how it works in practice.

1. Put the booster first in your chain. Straight after the guitar. No buffered pedals in front of it. That’s important. A BOSS tuner or similar buffer in front of a treble booster will make it sound thin and harsh.
2. Set your amp just at the edge of breakup. Use the normal or bass channel, not the bright one. Let the booster handle the top end.
3. Leave the booster on. Use your guitar volume to move between clean, crunch, and drive. Give it ten minutes. It feels weird at first. Then it clicks.

There’s lots of options out there, and I’m not trying to sell you anything. But the Vox VTB-1 is probably the easiest way to try this right now.

At $149, it’s hard to argue with.

It uses a hand-selected silicon BC108 transistor, engineered to capture the feel and response of the old germanium circuits, without the temperature problems and noise that made originals unreliable.

One boost knob, plus a “Fat” switch that broadens the frequency range for humbuckers.

Simple. Affordable. And the first treble booster from a major brand in a long time.

If you want more options (for the sake of fairness):

1. The Catalinbread Naga Viper MKII (around $115–$150) gives you more knobs to play with.
2. The Analogman Beano Boost is the boutique gold standard.
3. And if you’re handy with a soldering iron, the Rangemaster circuit is one of the simplest pedal builds there is.

So, the Rangemaster came out in 1965.

Sixty-one years later, Vox just reminded us it was there all along.

Some things don’t need improving…

They just need rediscovering.

Cheers,