Скачать с ютуб 🛠️ ReVox A77 Reel-To-Reel + DIY Varispeed Mod, Part 1: How-to, Tape Echo / Dub FX + Demos 🔊 в хорошем качестве

🛠️ ReVox A77 Reel-To-Reel + DIY Varispeed Mod, Part 1: How-to, Tape Echo / Dub FX + Demos 🔊

A work in progress: Adding variable speed, AKA "Varispeed" / pitch control - to a ReVox A77 Mk IV reel to reel tape machine. See below for timeline links and more details! UPDATE: August 9th, 2020: Part 2 is now live.    • 🛠️ ReVox A77 + DIY Varispeed, Part 2:...   00:00 - Intro / quick demos 01:52 - DIY / how-to intro 02:33 - Experiment #1: 10KΩ Trimpot replacement 03:07 - Test: 10KΩ external potentiometer 04:15 - Experiment #2: DIY Varispeed Circuit 05:11 - A77 vs. B77 circuitry comparison 05:41 - ReVox B77 Variable Speed Control circuitry 05:55 - DIY Varispeed circuit build 06:34 - Wiring to 555 timer on ReVox A77 PCB 06:59 - Varispeed Test: it works! 08:00 - DEMOS: Tape echo / dub loop + Varispeed 08:18 - Demo: Real-time pitch shifting (±7?) 09:28 - Faster speeds increase frequency range 09:50 - Quick vs. gradual speed changes 10:26 - Double-time reggae dub effect 10:48 - Regular playback, pitch changes 11:42 - Telephone mic / voice echo silliness 12:29 - Cartoon-style sound effects 13:36 - Pitch deviation tone test (±7?) w/spectrum display 15:22 - Capstan motor running at different speeds, with sound 16:38 - Quick calibration of new 10KΩ pot This is long, but may be of interest for those who have an A77 like this and want to try similar. If you aren't interested in the tech bits, you can skip to the demos. I also happened to be watching a certain time travel movie series during the making of this, and found it inspiring. Sorry. ;) This video covers two approaches: Trying a 10KΩ potentiometer (variable resistor), vs. building an "official" varispeed circuit based on the ReVox B77 remote varispeed control. ❇ DETAILS ❇ ReVox's B77 (Mk II?) and newer models have official varispeed features. With the B77 Mk II and the official ReVox varispeed remote control, you can get ±7 "deviation" in speed / pitch - which is a pretty great range. The A77 model doesn't come with varispeed built-in, but it turns out you can add it if you have an A77 Mk IV model. These have what I'll call a "varispeed-compatible" circuit board (capstan motor speed control board) that uses a 555 timer IC to control motor speed. It looks very similar to the one used in later B77 models. From what I've found, the A77 Mk IV 555 timer-based board can work with a circuit based on the official Varispeed remote control that ReVox makes for the B77. ❇ IN CLOSING ❇ I think this video took over 20 hours to edit and revise - maybe more time than was spent on the actual project. 😅 Thanks are due to various rights holders and artists whose work has been sourced and sampled, here. "No copyright intended." Please support your local musicians. And movie theaters. :P Thanks are also due to the kind folks at tapeheads.net, an analog audio forum with some truly-knowledgeable and helpful people. Shout-out to user PierreO in particular, for tips on this project. Thanks for watching.