What Does Chorus Look Like On A 'Scope? - JC77 Quickie
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- Опубліковано 7 вер 2024
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Equipment:
Soldering:
Pace MBT station w/SX100 & PS-90 handpieces
Hakko 474 w/815 handpiece
Hakko 936 w/907 handpiece
Hakko FX-888D w/FX-8801 handpiece
Quick 861DW hot air station
BOFA fume extraction unit
Loctite Multicore solder (C511 / 362)
Test Equipment:
Fluke 11, 175, 177 & 179 handheld DMM's
Tektronix 2236 analog oscilloscope
Rigol DS-1054z digital oscilloscope
BK Precision 4017A sweep / function generator
BWD 160a function generator
HP 6236B triple output DC power supply
Kyoritsu 3132A insulation / continuity tester
Video equipment:
Overhead cam: Panasonic HC-V785 w/Audio Technica AT9946CM mic
Handheld cam: Panasonic DC-G85 w/Olympus M.Zuiko Pro 12-40mm f/2.8
On location cam: Panasonic DC-GH5s w/Panasonic-Leica 9mm f/1.7 & 12-60mm f/2.8
Capture card(s): Magewell HDMI USB, ATEN UC3020-AT, ATEN UC3021
Headset Mic: Audio Technica BP892xcW-TH
Lapel Mic: Rode Go
Editing: Adobe Premiere Elements
Hand Tools:
Wiha, Felo, Stanley screwdrivers
CK & Engineer cutters / pliers
RS Pro wire strippers
Sidchrome & Gear Wrench spanners, sockets & shifters
Veritas planes & chisels
Materials / Consumables:
JJ's / TAD electron valves
Elixir / Ernie Ball / D'Addario / Rotosound strings
Electrolube & DeoxIT cleaners, lubricants & chemicals.
Everyone loves a quickie!
There's something beautiful and elegant about those waves
Roland Boss just loved using those SIP op amps. Those were a great, "howdy, fuck you tech", when you pulled the cover off and realized, "I don't have these in stock and I am not even sure where to find them". We had computer bulletin boards back in the 1980s but nothing remotely resembling the modern internet. I do have SIP 4558s & other op amps in stock, now. A typical non-modulated chorus effect is generally a delay of between about 45 milliseconds and maybe 75-90 milliseconds. If you have a digital display, digital delay, stay away from 60 MS. That delay will eat up most A notes' sustain with standing waves. Mathematically it makes no sense, but it still does it. Other chorus delay rates will kill other notes. Flanging is generally single digit up to 20 or 30 millisecond delay. Jimi Hendrix & Eddie Kramer used hand flanging which is where the term flanging comes from. Run your track on two synchronized RtR tape playback decks and drag your fingers on the pay out spool's flange of one of them. The flanging rate varies and it's a unique sound. Albums like Crash Landing & Cry of Love have more of the hand flanging. They also used a slinky in place of a spring reverb on one or two tracks. There is even a credit from whomever was shaking the slinky around.
Always good to see a non tube amp in the works. Especially grateful for demystifying the fabled chorus. 🤘
That oscilloscope clip *finally* explained the chorus effect for me. Written descriptions always failed miserably. Thank you!
Now I really want to see a phaser on the scope. People write about the “barber pole” effect, but I just don’t understand 😢
I used to work as a salesman in my local music store back some 8-9 years ago, & the description i've always given people who were dwelling in modulation for the first time was as follows:
- Chorus sounds like water, gentle waves crashing softly.
- Flanger takes the water & shifts into a storm/cyclone, where a plane is stuck in the eye of it trying to escape, but always falling & pulling up.
- Phaser, depending on how many phases it has (2, 4, 6, 10), can either sound very subtle & warbly, to spaced out as if on some psychedelic trip. A vacuum sucking the air around, only to have it come back around for a duration of time (fast of slow).
love a quicky
My repair shops have a decal with their contact information that they stick on the back panel. Some use paint markers and write on the tubes, I’m happy either way.
Those signals to x and y and it is even more entertaining. 🤓
Awesome.
Cool
Love that shimmy! 🌴👯 🌴
What does a nose whistle look like on the scope? ; )
Would your opamp mod help reduce the hiss in a JC-120? Which resistors are the most important to replace with metal film?
Got a question. Are the newer JC120 amps (the one i got is a jc120p) have analog chorus? Can't really see any confirmation online
ABC logo... lol