Heureum (흐름)
Pronounced (HOO-ruhm)
“Flux, or Flow”
J.K’s “Perfected” 100w Late 60’s Jose Modified JMP Super Lead
(4x EL-34 / 4× 12AX7)
The Heureum is a 100w, Point-to-point hand-wired late 60’s Super Lead inspired amplifier with a few tricks up it’s sleeve.
This amplifier was born out of J,K’s want and need for the ultimate no-frills tone machine. His obsession for tones from VHI→5150, Nuno Bettencourt, & the 80’s hard rock modded Marshall tones drove this design.
“Honestly, the Heureum is what I wanted so many manufacturers to have created, the design was born out of a frustration that the amp I wanted didn’t exist”
No expenses spared, no corners cut, all premium components from incredible manufacturers.
Quality > Lower cost for this amplifier is what J,K. went for.
”J.K.1984” Input: (3 Gain Stage Custom Voiced Jose)
“J.K. 1969” Input: (“Stock” 2 gain stage Plexi)
Vol 1 & 2 both active when in high gain input.
Low Gain Input fully bypasses Jose gain stage & Removes it from signal path
-Internally-Jumped, Custom voiced “J.K. ‘69” Plexi Channel
-3 Band Tone Stack + presence
-Jose Pre-Phase inverter Master Volume (PPIMV Available upon request)
-Slave output for wet/dry operation
Custom Mercury Magnetics Transformers are the heart & soul of the amplifier.
With a 460v B+ Power TX, and a custom wound, custom impedance Output Transformer, & 3H Choke, the Heureum has an authority & honesty to the tone.
It can easily nail early VHI→ VHII tones, all the way through to 1984, Diver Down & 5150, with no boosts or EQ shaping in post.
The custom Output TX contributes to a percussive & tighter/more articulate low end response than a stock SLP. (influence from Nuno Bettencourt)
Deposit for NOS Version of the Heureum 100w Head. 50% down, 50% upon ship
(흐름)- “Flow"/Flux”
This is J.K.’s “perfect” Late 60’s Modded Marshall. No Frills, no un-necessary circuitry, no fx loop (GASP!)- voiced using years of experience working on Joe Satriani’s Best of All Worlds amp, and voicing/R&D-ing amps for pro players around the world. The circuit has been refined and honed in to what J.K. likes and needs as a player, with refinements using many years of touring, recording, and more.
-100w PTP Hand-Wired turret board, Single Channel, two voices: High-Gain Jose (3 Gain Stage) + Low Gain (Custom Voicing Stock 2 gain stage late 60’s plexi)
-CUSTOM Faceplate art by NaRae Kim (@naraeink)
-Certificate of Authenticity & Numbered / hand signed chassis + placard (only 5 custom shop variants will be made)
-4x Mullard Reissue EL-34 + 4× 12AX7 (NOS available upon request)
-Can Bypass Jose Stage completely out of circuit using low gain input
-Slave Out circuit for wet/dry
-Plexi channel internally jumpered, and still active in Jose Mode.
-Jose Pre-Phase Master (can wire a PPIMV along side it, for an extra 100$)
-Mercury Magnetics Power TX, Custom Impedance Output TX, Choke
-Takman Audio, Dale Mil-Spec, Ohmite, as standard
-Allen Bradley NOS CC, Riken NOS in NOS Custom Shop variant only
-Jupiter, Sprague Atom New production, Solen, Vishay Bypass & electrolytics as Standard
-1000v Sozo Silver Mica treble & tone stack caps as standard
-NOS Mullard Mustard, NOS Sozo, NOS Sprague bypass in NOS Custom Shop variant
-F&T Filter capacitors as standard, ARS Re-formed NOS in NOS Custom Shop variant
-Tocos Sealed Mil-Spec Potentiometers As standard
-Cliffs Old-Style Jacks
-1969 Clone Steel Chassis by Valvestorm
-Sourmash Head Cabinet in British Green Standard, or Dark Red Taurus as standard
(흐름)- “Flow"/Flux”
This is J.K.’s “perfect” Late 60’s Modded Marshall. No Frills, no un-necessary circuitry, no fx loop (GASP!)- voiced using years of experience working on Joe Satriani’s Best of All Worlds amp, and voicing/R&D-ing amps for pro players around the world. The circuit has been refined and honed in to what J.K. likes and needs as a player, with refinements using many years of touring, recording, and more.
-100w PTP Hand-Wired turret board, Single Channel, two voices: High-Gain Jose (3 Gain Stage) + Low Gain (Custom Voicing Stock 2 gain stage late 60’s plexi)
-CUSTOM Faceplate art by NaRae Kim (@naraeink)
-4x Mullard Reissue EL-34 + 4× 12AX7 (NOS available upon request)
-Can Bypass Jose Stage completely out of circuit using low gain input
-Slave Out circuit for wet/dry
-Plexi channel internally jumpered, and still active in Jose Mode.
-Jose Pre-Phase Master (can wire a PPIMV along side it, for an extra 100$)
-Mercury Magnetics Power TX, Custom Impedance Output TX, Choke
-Takman Audio, Dale Mil-Spec, Ohmite, as standard
-Jupiter, Sprague Atom New production, Solen, Vishay Bypass & electrolytics as Standard
-1000v Sozo Silver Mica treble & tone stack caps as standard
-F&T Filter capacitors as standard
-Tocos Sealed Mil-Spec Potentiometers As standard
-Cliffs Old-Style Jacks
-1969 Clone Steel Chassis by Valvestorm
J.K. Brings his experience voicing & building amplifiers for, as well as touring, and collaborating with many industry greats in the Hard Rock scene.
J.K’s experience building, and voicing Joe Satriani’s DRGN 100 Rig for the “Best of All Worlds” tour designed to nail Van Halen’s 1986’s Live without a net tone, inspired him to create his “perfect” brown sound amplifier to his specs and ear.
User Selectable Option: Presence Capacitor
Jupiter Condenser Yellow Tone .1uf / 600v
Upper Mid Bite, less is more, cuts through the mix- colors tone more.. Leans more into the more aggressive styles of music & lead guitar
Great for players that want to SLICE & CUT- ESP. WITH DARKER PICKUPS OR SPEAKERS
NoS Ero Roderstein MKT1813 .1uf / 630v:
Creamy, more in focus than the Jupiter. No upper mid accentuation, flatter response & can crank without harshness
Great for players who want an all around balanced tone, less nasal upper mid, and have speakers and pickups that lean bright
Reference Specs & material-
Transformers: Mercury Magnetics 460V B+, Custom Wound OPT, 3H Choke
Capacitors: Jupiter Condenser, Sprague Atom, Solen, Vishay, Sozo Mica, Capacitors StandardNOS Mullard Mustard, NOS Vintage Sozo, NOS Sprague Electrolytics in Custom Shop Variant
Resistors- Takman, Dale, Xicon, Vishay as standard
NOS Allen Bradley, NOS RIKEN, in NOS Custom Shop Variant
Potentiometers: Tokyo Cosmos (Tocos) Sealed Mil-Spec, CTS (Slave out)
Jacks: Cliffs Old-Style Jacks
Chassis: 1969 Clone Steel Chassis by Valvestorm
Head cab: Sourmash British Racing Green Large Headbox
Faceplates: Custom Art by NaRae Kim (@naraeink)
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PTP Handwired, Turret Board construction
Class A/B, Fixed Bias, Quad EL34, Solid State Rectification
Mercury Magnetics Power TX, Output TX, Choke
460v B+ for brown response, Custom Output TX Impedance with increased Low End articulation & clarity
4/8/16 Ohm Outputs
Line Level Slave out for Wet/Dry
Custom Grounding scheme & Noise reduction techniques
Recommended Bias: 68-72% (38ma)
Recommended Wall Voltage: 116-120V, can Variac down to 90v & re-bias
Recommended Tube Set: 4x Mullard Reissue EL-34 Apex Matched, 1x Sovtek LPS V4, Mullard 12AX7 for V2-V3, Mullard CV4004 V1
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Once we recieve your deposit, we order all parts necessary, these are built to order & take between 1-3 weeks to build, and burn in before shipping. This excludes any lead times on parts sourcing etc.