The standard 5 volt gate signals used by most modern gear including Eurorack systems and sequencers will not trigger a number of vintage synthesizers that require a higher gate voltage to trigger their envelopes - some early Roland synths including the System 100 (101,102), SH-5, some ARP, Oberheim and Sequential Circuits machines all need a higher gate voltage. The GA-1 Gate Amplifier will take a 5v gate signal and boost it to the supply voltage of your chosen DC power adapter - a 9v supply will give a gate voltage output of 9v, a 12v supply will give you a 12v gate etc. A multi voltage type DC power supply is ideal as you can adjust the output to suit your particular synth.
The GA-1 is a basic transistor amplifier circuit. A simple and inexpensive way to boost gate voltages without the need to modify valuable vintage synths. If you would like to build this circuit yourself I have provided the schematic on the tech page here.
Requires a DC power supply in the range 9-15v, NEGATIVE TIP (centre negative), 2.1mm plug. Due to the many different plug types and mains voltages around the world it is not economical for me to supply a DC adapter. These are easily sourced locally if you don't already have one in your studio. (I can supply a suitable psu for an additional fee if you have trouble finding one - contact me if required.)
Supplied with 6.35mm jack sockets as standard. Mini jacks (3.5mm) available on request.
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Customer ratings for GA-1 Gate Amplifier
Number of ratings: 1
Average rating: 5
Excellent from Jon F on 27/03/2018
Ordered these for my Roland System 100 Model 101 & 102, both require quite a high gate voltage. I use a 12v dc adapter and everything works perfectly. Thank you for making this available.