JSA Effects
@jsaeffects.bsky.social
One man and his cat building guitar pedals by hand in the heart of the UK
New tin build; this cheeky two-in-one combines a Bluesbreaker style circuit with a SSS Dumble style preamp for ultimate John Mayer toanz
October 22, 2025 at 10:11 PM
New tin build; this cheeky two-in-one combines a Bluesbreaker style circuit with a SSS Dumble style preamp for ultimate John Mayer toanz
This was a mega fun build. My "Sustainrrr" - a reworked Elk Superfuzz Sustainer - built with vintage accurate components, and with a 90's Grunge aesthetic
October 17, 2025 at 8:48 PM
This was a mega fun build. My "Sustainrrr" - a reworked Elk Superfuzz Sustainer - built with vintage accurate components, and with a 90's Grunge aesthetic
Get Muff; Play Muff; Win!
October 15, 2025 at 10:46 AM
Get Muff; Play Muff; Win!
Big fuzz pedal = even bigger riffs. A very special one off germanium fuzz, built around a pair of 'spam can' NKT transistors and a slew of other vintage components (mostly harvested from some incredibly old Pye radios)
September 30, 2025 at 6:18 PM
Big fuzz pedal = even bigger riffs. A very special one off germanium fuzz, built around a pair of 'spam can' NKT transistors and a slew of other vintage components (mostly harvested from some incredibly old Pye radios)
"Hen's Teeth TS" overdrive pedal doing some sweet higher gain tones. This thing is packed to the brim with magic unicorn hair and unobtainium mojo
September 23, 2025 at 7:48 PM
"Hen's Teeth TS" overdrive pedal doing some sweet higher gain tones. This thing is packed to the brim with magic unicorn hair and unobtainium mojo
Here's another clip of this extra special "Hot Toddy" discrete op amp overdrive pedal, this time set for higher gain
September 20, 2025 at 8:20 PM
Here's another clip of this extra special "Hot Toddy" discrete op amp overdrive pedal, this time set for higher gain
The "Hot Toddy" is my flagship discrete op amp transparent overdrive pedal. This particular version is an extra special one made for the Leeds Pedal Show 2026 raffle
September 18, 2025 at 10:17 PM
The "Hot Toddy" is my flagship discrete op amp transparent overdrive pedal. This particular version is an extra special one made for the Leeds Pedal Show 2026 raffle
As part of the continued celebrations for the 10th anniversary of JSA Effects, I've built an extra special "Horse Whisperer" - my infamous discrete op amp Klon - in an Ernie Ball/John Mayer "Silver Slinky" tin. It's available right now on my Reverb store for less than you'd think 😉
September 10, 2025 at 9:45 PM
As part of the continued celebrations for the 10th anniversary of JSA Effects, I've built an extra special "Horse Whisperer" - my infamous discrete op amp Klon - in an Ernie Ball/John Mayer "Silver Slinky" tin. It's available right now on my Reverb store for less than you'd think 😉
I built a tube screamer pedal with the rarest of the rarest parts, including a vintage TL4558P, MA150 diodes, and blue 'orange drop' capacitors (that's right; orange drops, but they're blue in colour! 😮) and a whole heap of other cool things. It sounds like this - "Hen's Teeth TS"
September 6, 2025 at 10:30 PM
I built a tube screamer pedal with the rarest of the rarest parts, including a vintage TL4558P, MA150 diodes, and blue 'orange drop' capacitors (that's right; orange drops, but they're blue in colour! 😮) and a whole heap of other cool things. It sounds like this - "Hen's Teeth TS"
I was lucky enough to grab an original Boss OD-1 last year and almost instantly fell in love with it. However, true to form, I had some ideas to mod it, and rather than modify a collectors pedal, I built one from scratch with vintage parts. It sounds awesome 👌
August 29, 2025 at 9:36 PM
I was lucky enough to grab an original Boss OD-1 last year and almost instantly fell in love with it. However, true to form, I had some ideas to mod it, and rather than modify a collectors pedal, I built one from scratch with vintage parts. It sounds awesome 👌
How do you make one of the rarest production pedals even more fancy? By building it with a rare of era accurate and vintage components
August 27, 2025 at 10:01 PM
How do you make one of the rarest production pedals even more fancy? By building it with a rare of era accurate and vintage components
Is it green? Is it purple? Is it gruple!?! Who knows! All you need to know is that it sounds incredible and is part of a very special batch for early next year (also the makers on the knobs glow in the dark)
August 25, 2025 at 11:29 PM
Is it green? Is it purple? Is it gruple!?! Who knows! All you need to know is that it sounds incredible and is part of a very special batch for early next year (also the makers on the knobs glow in the dark)
This cheeky little fly rig did its job perfectly last week. The "Secret Sauce" is a super secret custom two-in-one that does exactly what it says on the tin
August 24, 2025 at 7:51 PM
This cheeky little fly rig did its job perfectly last week. The "Secret Sauce" is a super secret custom two-in-one that does exactly what it says on the tin
Given the upcoming tariffs and whatnot, rather than wait until the end of the year, I'm gonna drop my "Shelf of Forgotten Pedals Sale" this week so that Americans can also get in on the action before everything basically doubles in price for them
August 18, 2025 at 8:16 PM
Given the upcoming tariffs and whatnot, rather than wait until the end of the year, I'm gonna drop my "Shelf of Forgotten Pedals Sale" this week so that Americans can also get in on the action before everything basically doubles in price for them
Test build for a small batch of extra fancy drives coming early next year
August 17, 2025 at 9:09 PM
Test build for a small batch of extra fancy drives coming early next year
Long evening organising parts for a special batch of pedals
August 16, 2025 at 8:00 PM
Long evening organising parts for a special batch of pedals
Porta-studio-in-a-box pedal? I've been building them for over a year, and they sound like this
August 11, 2025 at 8:30 PM
Porta-studio-in-a-box pedal? I've been building them for over a year, and they sound like this
Something extra cheeky; this is my "Little Treble Maker" with a twist - a buffered bypass. "But Simon, buffered bypass guitar pedals suck!?" I assure you this one not only doesn't suck, it makes everything sound fuller and clearer. This is now the perfect tone maximiser
August 7, 2025 at 12:55 AM
Something extra cheeky; this is my "Little Treble Maker" with a twist - a buffered bypass. "But Simon, buffered bypass guitar pedals suck!?" I assure you this one not only doesn't suck, it makes everything sound fuller and clearer. This is now the perfect tone maximiser
Cheeky two-in-one; germanium fuzz face with external bias control and vintage spec Tube Screamer with SRV mods. This is an absolute beast and nails Eric Johnson tones
August 5, 2025 at 11:07 AM
Cheeky two-in-one; germanium fuzz face with external bias control and vintage spec Tube Screamer with SRV mods. This is an absolute beast and nails Eric Johnson tones
A custom "Horse Whisperer" - my discrete op amp reimagining of the legendary Klon "Centaur". This particular version also has a switchable buffered bypass and battery snap
August 3, 2025 at 10:15 PM
A custom "Horse Whisperer" - my discrete op amp reimagining of the legendary Klon "Centaur". This particular version also has a switchable buffered bypass and battery snap
It's been a long time since I built one of these; the "Horse Whisperer" is a discrete op amp reimagining of the legendary Klon Centaur
July 30, 2025 at 8:59 PM
It's been a long time since I built one of these; the "Horse Whisperer" is a discrete op amp reimagining of the legendary Klon Centaur
RF Potts is an electronics shop in sunny ol' Derby, and is nearly 100 years old! Because it's so close to Rolls Royce, over the years, they have acquired huge amounts of spare parts from them. This means when you go diving through their old stock, you find genuine treasure
July 27, 2025 at 9:11 PM
RF Potts is an electronics shop in sunny ol' Derby, and is nearly 100 years old! Because it's so close to Rolls Royce, over the years, they have acquired huge amounts of spare parts from them. This means when you go diving through their old stock, you find genuine treasure
Semi-vintage nonsense today. A Mk 1.5 Zendrive, by which I mean a 1:1 original Zendrive, but with the 'correct' tapers for the voice and gain pots, updated op amp, and the input stage from the Nobels ODR-1 added
July 21, 2025 at 11:45 PM
Semi-vintage nonsense today. A Mk 1.5 Zendrive, by which I mean a 1:1 original Zendrive, but with the 'correct' tapers for the voice and gain pots, updated op amp, and the input stage from the Nobels ODR-1 added
"Lady Garden" - a modern fuzz built around delightful vintage nonsense. What would happen if you slammed a MOSFET style boost in to a vintage Muff Fuzz? In a word; awesomeness! The bias control takes you from sweet drive to earth shattering fuzz to gated velcro
July 20, 2025 at 9:20 PM
"Lady Garden" - a modern fuzz built around delightful vintage nonsense. What would happen if you slammed a MOSFET style boost in to a vintage Muff Fuzz? In a word; awesomeness! The bias control takes you from sweet drive to earth shattering fuzz to gated velcro