Electro-Harmonics Small Stone EH-4800 Phase Shifter Pedal History & Reference Photos

Electro-Harmonics Small Stone EH-4800 Phase Shifter Pedal

The History

The Small Stone EH-4800 Phase Shifter Pedal by Electro- Harmonics made its debuted in 1974 and continued to be produced up until 1984. The small stone was designed by David Cockerell and utilized operational transconductance amplifiers unlike other phase pedals at the time such as the MXR Phase 90 Phaser that used a series of JFET's and op-amps, or the Mutron Biphases that used LDR's also know as light dependent resistors, the use of operational transconductance amplifiers gave the Small Stone its own unique tone making it one of the most sought after phases pedals on the market.

Electro-Harmonics Small Stone EH-4800 Phase Shifter Pedal

The Circuit & Parts

The circuit design of the Small Stone is quite simple overall, The small stone features a total of 5 EH1048 OTA (operational transconductance amplifiers) which are no longer in production, however they can be replaced with a CA3094, which is the modern equivalent. The Small Stone also contains Nichicon branded capacitors, 2 33uf 10V and 1 10uf 16V. The one potentiometer on the pedal is a 1 Meg CTS branded made in the USA pot. Some other notable features of the Small Stone include the unique 3.5mm 9 Volt DC power supply.

Notabel Parts

• 5 EH1048 OTA (operational transconductance amplifiers) which are no longer in production, however they can be replaced with a CA3094

• Nichicon branded capacitors, 2 33uf 10V and 1 10uf 16V

• 1 Meg CTS branded made in the USA pot

Reference Photos

Below is a collection internal and external reference photos of the Small Stone EH-4800 Phase Shifter. If you are a tech in need of more photos, schematics, or resources please feel free to fill out a contact form letting us know how we can help you out!