Here is yet another SRD-7 which I have modified for Pro bias with the bias boards I designed. I did my usual mods which include wiring the transformers directly to the output sockets and to the new binding posts on the back. Power wiring is moved as far away from the signal wiring as is possible and the input switch is now just used for the power. I also removed the neon light on this one and installed a red LED instead so it is that much cooler.
The box shows it's age but this unit does have the newer and much nicer Stax sockets (same as the current ones) and it functions perfectly. One Pro and one normal bias output on this one and it can be used anywhere in the world (100-240V AC input). It has a US/Japan power plug but I can install a Schuko unit should it be required. .