The Cerulean Amp Overdrive is an updated version of the Marshall Bluesbreaker pedal, in production from 1991 to 1999. A legend in its own right, it was also the source circuit for a number of expensive boutique pedals, most notably the Analogman King of Tone, which is two Bluesbreakers in the same box with a few modifications.

In 1995, Marshall moved production from England to Korea, and around this time they made some tweaks to the circuit, increasing the gain and reducing the bass. The Cerulean project has a switch to go between both modes so you can hear the differences. It also borrows the expanded clipping options from the King of Tone, allowing you to select either soft clipping (stock), hard clipping, or no clipping (boost mode).

Demo by  Jeffrey Richard

Demo by R.J. Ronquillo

Product Page

Review by reddit /guitarpedals

Cerulean Amp Overdrive / Marshall Bluesbreaker 

The Quartz Optical Compressor is based on the Diamond CPR-1 Compressor and BCP-1 Bass Compressor, two vintage-inspired optical compressor pedals that share the same overall schematic.

The original Diamond Compressor was released in 2005. Like other optical compressors, it used an optocoupler for dynamic gain reduction. But the tone control was something never seen before in a pedal: an adaptation of the “Tilt” control from the Quad Model 34 hi-fi preamps of the 1980s, which is similar in usage to the bass/treble pivot of the Big Muff tone control, but refined so that it has a truly flat frequency response in the middle.

The Quartz is an adaptation of the original Diamond circuits that allows either the standard or bass version to be built. Our version also adds a third position to the frequency selector, which is a feature in the 2023 compact pedals but not the originals.

Review by Talk Bass.com

Manual

Quartz Optical Compressor 

The Lumin project is a workalike of the BBE® Sonic Stomp / Sonic Maximizer. It’s based on work done by Bajaman (documented on FSB)[1] and Sebastian Montti (stm) on DIYStompboxes in recreating the functionality of BBE’s proprietary NJM2150AD chip.[2]
The BBE 482i Sonic Maximizer rack unit first appeared on the scene in the late 1980s and quickly achieved legendary status among sound engineers for the way it imparted clarity on the signal—often described as sounding like a blanket was lifted off the speaker cabinet. The circuit is said to create “frequency-dependent time alignment” so that the audio frequencies hit the speaker in a more optimal way. Many professional audio setups even outside the music industry utilize the “BBE process” to enhance sound quality.

Demo by James Pier

Lumin

Das Elysium Ambient Delay ist eine Adaption der Ibanez EM5 Echo Machine, einer späten Ergänzung der von 1996 bis 2000 produzierten Soundtank „5 Series“.

Die EM5 wurde entwickelt, um Bandverzögerungsgeräte aus den 1970er Jahren zu emulieren. Während der Delay-IC technisch gesehen ein digitaler Chip mit einer analogen Schnittstelle ist, ähnlich wie der PT2399, wird das Delay-Signal stark gefiltert - einschließlich einer Overdrive-Stufe mit Diodenbegrenzung, ähnlich wie beim Tube Screamer - was ihm einen warmen, atmosphärischen und sehr analogen Sound verleiht, der Tiefe und Substanz verleiht, ohne im Weg zu sein oder den Ton zu trüben, und der für jeden Spielstil geeignet ist.

Der Elysium ist eine exakte Nachbildung des EM5, mit dem Unterschied, dass die JFET-Schaltung auf True Bypass umgestellt wurde. Der ursprüngliche EM5 war berüchtigt für seine unzuverlässige Schaltung, so dass dies eine deutliche Verbesserung gegenüber der Soundtank-Version ist, während der Signalweg identisch bleibt.


The Elysium Ambient Delay is an adaptation of the Ibanez EM5 Echo Machine, a late addition to the Soundtank “5 Series” produced from 1996 to 2000.

The EM5 was designed to emulate tape delay units from the 1970s. While the delay IC is technically a digital chip with an analog interface, similar to the PT2399, there is a great deal of filtering applied to the delay signal—including a diode-clipping overdrive stage, similar to the Tube Screamer—which gives it a warm, ambient, and very analog sound that adds depth and substance without getting in the way or muddying the tone, suitable for any style of playing.

The Elysium is an exact recreation of the EM5, except that the JFET switching has been converted to true bypass. The original EM5 was notorious for its unreliable switching, so this is a significant improvement on the Soundtank version while keeping the signal path identical.

Official Product Video

Review by reddit /diypedals

Build Documentation

Elysium Ambient Delay

The Azure Analog Chorus is based on the BOSS® CE-2, first released in 1979 and generally considered to be one of the best chorus pedals ever made. With only two knobs, it’s simple to operate, but it doesn’t take long to understand the wide range of sounds contained inside.

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Cerulean Amp Overdrive / Marshall Bluesbreaker

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