IK Multimedia Brown Sound ’78-’79 Signature Collection

Every decision behind the Brown Sound 78/79 was made to capture not just the gear, but also the attitude, the feel, and the raw sonic blueprint of a genre-defining moment in rock history. With a mix of confirmed and speculated setups, including alternate speakers such as the 4×12 combo cab loaded with two vintage JBL® D120s and two 25W Greenbacks®, these Tone Models deliver stunning accuracy and creative flexibility. Complete the experience with Sunset Sound Studio Reverb and recreate the tone that changed guitar forever.

Collection Overview
58 exceptional Tone Models for use across the entire TONEX ecosystem
Based on a ′68 Marshall® Super Lead modified to serial number #12301 specs
Models feature multiple 1960 Marshall® cabs with different speakers
Details include running the signal through specific pedals and a Vega wireless
Captured using period spec studio gear, just like the original recordings
Created using AI Machine Modeling™ technology with advanced training
Compatible with all TONEX software versions, including the free TONEX CS
Tone Models can easily be loaded to TONEX pedals for live performance

The amp: “The ONE”
At the heart of the Brown Sound 78/79 collection is “The ONE” – a meticulously crafted Marshall-style amp built from the ground up with the exact same spec as the infamous 1968 Super Lead serial number #12301, including crucial mods that capture the DNA of the early brown sound like no other amp model.

A big part of that sound comes from the Fat Cap mod, a custom tweak to the preamp’s second gain stage that increases low-frequency gain and creates that signature chewy midrange and hair on every note. Combined with a 50K mid pot (which shifts the EQ balance toward a more vocal, aggressive midrange), as found on the legendary #12301 Plexi, the amp punches with the exact presence and attitude heard on the earliest Brown Sound recordings.

A 100K NFB (Negative Feedback Resistor) from a 4Ω tap was added to the amplifier to further refine the distortion characteristics, making the tone a little bigger and bolder, just like those early recordings.

Under the hood, Heyboer transformers (faithful recreations of the original Dagnall® iron) deliver the correct dynamics and feel that only properly wound vintage-style transformers can. These aren’t just clones; they’re the backbone of the amp’s response and harmonic complexity.

Voltage controlled
TONEX’s advanced AI technology captures the true character of any amp as well as its organic feel and response to changes in voltage and bias. TONEX perfectly captures the saggier response and thicker gain produced when the voltage drops and tubes are starved for voltage.

The internal amp bias was maxed out and captured using several different Variac™ settings: 68, 89, and 78 volts. For the ′78 Tone Models, we used 78V and 89V and ran through all cab configurations, allowing you to hear and feel the various combinations of voltages and speakers.

We removed output tubes 4 and 5 to push things even further, breaking the traditional push/pull topology and producing an asymmetrical “pull-only” distortion, giving ′78 captures their signature bite, bloom, and angry edge. At 89 V, the amp tightens up with a little less gain, while 78 V makes the amp more spongy with a tad more gain, perfect for tapping and fiery leads.

For the ′79 captures, we used all 4 output tubes and set the Variac to 68 V amp, which gives you a meaner but slightly clearer sound heard throughout the album. You will notice the amp starts to breathe, but still delivers a natural amp compression that glues together legato notes.

Cabs: Built to shape the sound
Speaker choice was everything. We captured several classic and hybrid cab setups, each chosen for its unique role in crafting the tones of the era. Some combinations replicate known rigs, while others explore options players and experts speculate were used in-studio. Each cabinet was captured using a variety of voltages to provide a spectrum of feel (from tight and punchy to spongy and loose), tailoring the sag and compression like on the records.

Captured Cabinets:
Marshall® 1960A loaded with Celestion® G12M 25W Blackbacks (75 Hz)
Marshall® 1960A with Celestion® G12M 25W Greenbacks® (75 Hz)
Marshall® 1960A with Celestion® G12EVH / Heritage 20W Greenbacks® (75 Hz)
Marshall® 1960B “Peeled” combo cab loaded with two 25W Greenbacks® (75 Hz) and two JBL® D120 speakers

Studio Magic: Captured like an album
Every cab was miked with classic SM57s and run through a vintage-style analog console to capture the recorded vibe as authentically as possible. Each tone was sculpted like a real studio mix, and the results come frighteningly close to the album sound. Plug in a guitar with PAF-style pickups and you’ll feel like you’ve stepped into Sunset Sound Studios circa ′78/′79. A few captures were created using a U67 placed further back to increase resonance and soften the top end, making them perfect for double tracking with brighter, more articulate tones.

For players who want a bit more edge, we’ve included alternate “Hot” Tone Models, created by driving the analog mic preamp harder to add extra gain and saturation, just like what you hear on many early recordings.

Signal chain: Secret sauce included
Beyond the amp and cab, the front-end signal was run through the exact vintage pedals used in the original recordings, even when bypassed, to retain their subtle but crucial tonal imprint.

Signal chain:
Vega Wireless system (used on several ′79 captures)
1977 MXR® MX117 Flanger
Mid-′70s MXR® MX101 Script Logo Phase 90
1970s Maestro® Echoplex EP-3
70 feet of Belden 8410 & 8412 guitar cable (for realistic high-end rolloff and cable capacitance)

The Vega wireless touch
Several captures using the Vega Wireless system are included. Many players famously used it, even in the studio, for its slight compression and subtle tone thickening. This collection contains Tone Models with and without the Vega, allowing you to dial in either approach. The transmitter was captured with 3 gain levels, providing standard and 2 lower gain settings. This cleans up hotter pickups and adds more articulation to your sound.

Behind the collection
Jim Gaustad’s obsession with guitar sound began in the late ′70s, sparked by hearing Van Halen’s debut album. From gigging professionally at age 12 to touring nationally with original bands in the ′80s, Jim was always chasing the perfect sound, rebuilding amps on the road, modifying vintage Marshalls, and crafting custom pickups from spare parts. His relentless pursuit of authentic tone led to the formation of The G Men, a no-gimmick Van Halen tribute band known for replicating the original gear and sound. After Ed’s passing, Jim launched the Brown Sound Quest on YouTube, diving deep into vintage circuits, studio techniques, and signal chains to honor the sonic legacy that inspired it all.

Key amp specs include:
Heyboer Transformers (Dagnall clones)
6CA7 Output Tubes
Sylvania 12AX7 Preamp Tubes
50K mid-pot
Split cathode on V1a (250µF/820Ω) and V1b (.68µF/820Ω)
All coupling caps: 0.022µF
Bright channel coupling cap: 0.0022µF
470K mixer resistors
500pF red tubular mixer bypass cap
Fat Cap mod: .68µF and 250µF on V2a
Tone stack: 33k/560pF Lemco combo
100K NFB resistor from 4Ω tap
220K bias splitter resistors
0.1µF cap on presence control
0.022µF output couplers

Power filtering:
[2] 100µF F&T (mains)
[2] 32µF F&T (screens)
[1] 100µF LCR (phase inverter)
[1] Dual 33µF x 33µF F&T (preamp)