THD Quintet Tone Curve Board 6-Position Rotary Switch


THD Quintet Tone Curve Board – 6-Position Switch Model
For sale is a THD Electronics Quintet Tone-shaping onboard 6-Position rotary switch and PCB circuit – these are Brand New, and in their original packaging as shipped direct to us as THD’s Australian Distributor.


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4 in stock


THD Electronics Quintet Tone-shaping onboard 6-Position rotary switch and PCB circuit

Each one has included FREE, a Treble Bypass Circuit for your guitar’s volume control. The circuit consists of a resistor and capacitor wired in parallel – see photos…

The THD Quintet™ Tone Curve Module is a new and unique type of tone control designed to install into any electric guitar or bass with passive magnetic pickups. The Quintet uses no batteries, is 100% passive, and gives Five New Sounds from each of your existing pickup combinations. As with all THD products, they were handmade in the USA using the finest components available, and 100% tested before shipping.

Unlike other stepped tone con­trols on the market (which just roll off the treble in steps rather than continuously like a stock tone control), the Quintet changes the entire tonal re­sponse of your pickups, altering their bass, mid and treble reso­nances in dramatic and highly musical ways.

The Quintet passively couples to and interacts with the coils of your pickups, giving you tonal options you’ve never had before. You can make a Strat® pickup sound beefier, or a humbucker sound more focused. It can make a bridge posi­tion pickup sound like a neck pickup or like a pair of pickups in the in-between setting.

The 1st position on the Rotary Switch reduces the bass, gives a slight boost at about 700Hz, and a cut at about 2000Hz. This setting is useful for making a pickup sound a bit brighter and clearer, like taking a pickup from series to parallel coil wiring. It also makes a neck pickup more useful for leads.

The 2nd position gives a boost at about 500Hz, a cut at about 1800Hz and a slight drop in treble above about 4000Hz. It will make a Strat® pickup sound more like a Filter’Tron™.

The 3rd position gives a substan­tial boost at about 400Hz, and a cut around 1200Hz, with a slight rise at about 2100Hz and some treble reduction above about 3900Hz. This setting has a huge effect on the midrange character. It will make a Strat® pickup sound more like a Telecaster® in-between setting.

The 4th position gives a boost at roughly 300Hz, a substan­tial cut at about 800Hz, a slight rise at about 2200Hz and a drop in treble above about 4500Hz. This setting will make a humbucker pickup sound more like the middle setting on a guitar with two P-90 pickups.

The 5th position gives a boost around 320Hz, a cut near 1200Hz, a small rise at 2200Hz, and a drop off as the frequencies go up from there. This setting makes most bridge pickups sound like they are in the neck position.

There were three versions of the Quintet available for building into guitars:

The 3rd Quintet version as listed here, has a built-in 6-position rotary switch, giving instant access to all 5 settings and a hard-wired bypass. This can still be used with an intensity pot mounted to the guitar.

All models come with complete instructions and installation diagrams. As a gift, all versions come with a custom treble-bypass network to add to your volume control so that you don’t loose highs as you turn down your guitar.

Full fitting instructions are available/included, also tech backup from myself at Gilroy Guitars

Please address all enquiries, requests for spec sheets, install instructions, MP3’s etc to myself via ‘CONTACT’

The ‘on-board’ Quintet tone curve boards as listed, are identical in circuitry/effects to the Pedal model, as reviewed by Guitar Player Magazine.

Guitar Player Magazine, May 2008
THD Quintet Pedal
Sporting a five-position Curve switch and an Intensity control, the Quintet (Pedal)
(USA -$170 retail/$129 street – 2008) is designed to work in conjunction with your guitar’s pickups to deliver varying timbres. The Quintet is as passive as passive gets. There is no battery, and even though the pedal has labelled input and output jacks, it doesn’t matter which one you plug into. Just make sure the Quintet is the first pedal in your signal chain because its mojo lies in its interaction with your guitar’s pickups. The Quintet will not work properly, if at all, if it is placed after another pedal. Nor will it work with active pickups, piezos, or wireless units. (The Quintet is also available as a tone pot replacement that drops directly, and discretely into your guitar.)
With my Telecaster running through a Reverend Goblin 5-15, I began clicking through the Quintet’s tones. Setting One is the darkest, as it takes a rear position single-coil and fattens it up to an almost humbucker-like butteryness. For Strat players who are scared of honking on their rear-pickup this is a godsend, as it’s almost like changing pickups. With humbuckers, I found this position to be useable, but a tad wooly. Setting Four gives you a boost around 300Hz, a substantial cut around 800Hz, and a slight treble reduction above 4.5kHz. THD likens this tone to the in-between setting on a dual P-90 equipped guitar, and that’s a very fair description. I found it usable with all of my guitars, as it fattened up single-coils without sacrificing any of their inherent airiness, as well as giving humbuckers some added beef—albeit lean beef. Pretty neat. As you keep clicking, the tones get progressively skinnier, adding some Filter’Tron-like characteristics, as well as some good old-fashioned brightening. The Intensity control simply mixes your guitar’s straight signal with the Quintet’s, affording even more tonal flexibility.
The Quintet is subtle, and as simple as it seems, you can actually find yourself dicking with it for hours – at least I did. The shades it imparts make it a studio tool par excellence, as you can change the character of your guitar in a very natural and organic way. In fact, I would dial-up a setting on the Quintet, and adjust my amp’s EQ accordingly to get just the right fit. That, my friends, is tone shaping in the truest sense of the word.
THD Quintet
Kudos: An unassuming, yet powerful-as-hell tone tweaker.
Concerns: None
Contact: Aus Distributor –

Weight .35 kg