![]() ![]() This is to give you an idea about how you can cram this eq into an 19"2U standard rack-case: PSU based on two off-the-shelf power transformers, so you dont have to run around trying to get an obscure 220V secondary transformer. Unbalanced input with an option for transformer balancing. PCB-mounted switches for easier assembley. Standard rotary switches - 2圆 in stead of 2x7 and 2x3. "No feedback" SRPP gainstage, avoiding the interstage- and the esoteric output trafo, but preserving all that we really like in tube audio. This is an example of an updated and easier-to-do version of the Pultec PEQ1A. Schematic for our SRPP-based version PEQ1A EQ ![]() There are currently no PCB-layout available for this filter. I have'nt built a prototype yet, but with a bit of luck we can reuse the amp-pcb from the PEQ1A. The schematic shows the filter sections only, but amplifier section seems cross-compatible with the PEQ1A. Combine this with the Pultec PEQ1A, and you have just about everything you need EQ-wise. This is the schematic for the Pultec MEQ5 midrange-equalizer. Thanks to Chris Jenrick for sharing the "real" filter schematics for reference. Recent correction includes potentiometer values. Note that the transformer data are guesswork and dc-resistances. ![]() This is a piece of reverse-engeineering I did because at the time nobody seemed to have access to the schematics. ![]()
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