Tascam M-3500 Mixing Console Modifications

Here's a brief description of the modifications being done on the board. I will be putting together a detailed set of notes, including part numbers, so anyone with an M-3500 and being proficient with a soldering iron can greatly improve their board. These modifications were designed by James Zuehsow who I thank very much for taking a lot of time out of his schedule to share these with me.

• Op-amps in mic pre-amps replaced with socketed Burr-Brown OP2604 op-amps.
• All other op-amps out and replaced with socketed Analog Devices OP-275 op-amps.
• Remove many, many low quality coupling capacitors.
• All mix buss build-out resistors changed from 22k to 10k metal films.
• Parallel op-amp output capacitors with polyester film capacitors.
• EQ section: change High shelving to 12kHz and low shelving to 80Hz.

I am currently in the process of doing these mods, but I will try to put together the detailed instructions ASAP.

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