DIY All-Tube Phono Preamp Project Part 5, Circuit Board–Chassis Integration The Finish Line By Steve Graham This is it. We wrap it all up here. I hope I’ve enticed a few people to give this project a try. Yes, there have been many long attachments detailing the build procedure, but it’s the pictures that take up a lot of space. If you tackle this project, just take it step by step. Scrolling down to the attachment links below will get you to the finish line. Commonly available parts have been chosen. If you wish to colour outside the lines, parts and layout wise, the results may surpass those I’ve achieved, or they may not. Both the prototype and the unit our patron Adrian commissioned were off and running well, straight out of the gate. Measurements: Though my measurement capabilities are crude at best, I was able, with the help of a Hagerman inverse RIAA filter, to measure the RIAA correction of the phono amp. I can’t give a real definitive answer, but I’m confident the RIAA correction is flat with +/- 0.25 dB from 20 Hz to 20,000 Hz. While I had the equipment set up I also checked the [...]
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