#h949

. . @melodiumstudio 's #Eventide #H949 #Harmonizer is finally fixed and fully aligned: notably in and out levels, as well as the feedback path are now all consistent and back to normal 😊 (also corrected the displayed range of pitch shifting 😉) . The vintage digital FX box is ready to go home in Montreuil then 😉 . @eventideaudio @eventidefrance . #EventideInc #EventideAudio #H949Harmonizer #EventideH949 #EventideHarmonizer #EventideH949Harmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #EarlyDigital #Repair #Fix #ElectronicsRepair #VintageElectronicsRepair #StudioMelodium #MelodiumStudio #StudioMelodiumMontreuil #MelodiumMontreuil #StudioPiscineATokyo #PiscineATokyo #LeBonDocteurPrager #TheGoodDoctorPrager https://www.instagram.com/p/Bs7pUMAjCle/?utm_source=ig_tumblr_share&igshid=mfhhujhjd7zw

. . And the series continue... . Still working on the same #Eventide #H949 #Harmonizer (from the @melodiumstudio in Montreuil): just found a faulty 74C08 (CMOS) AND gate that was clearly damaging the clock signal going to the DA converter section of the Main output... causing a slight but hearable harmonic distortion on this output when switching to the harmonizing function, necessarily the most used one on these machines! 😨 . Upper left picture shows the two clock signals (one for each digital audio fragment needed for the pitch-shifting effect): yellow trace is the B part, blue trace is the A part. They should have been identical, except in phase (they must only alternate in time)... Upper mid picture shows the analog waveform resulting from the sample&hold process, after DA conversion (that is, a 1 kHz sine, but jagged because unfiltered): blue trace is clearly not as clean as the yellow one... 😥 Upper right picture shows the output of the op-amp that mixes both waveforms into one: no wonder that the audio output was distorted! . After replacement of the offending chip (that my trusty #ABI #ChipMasterCompact #ICTester found faulty too, see center left pic), the clocks' waveforms now look perfectly clean, and so do the the individual analog A & B outputs, as well as the blending of the two! 👌😊 . [center right pic shows the original, Harris-made MM74C08N chip, replaced with a NOS National one from 1987] . @eventideaudio @eventidefrance . #EventideInc #EventideAudio #H949Harmonizer #EventideH949 #EventideHarmonizer #EventideH949Harmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #EarlyDigital #Repair #Fix #ElectronicsRepair #VintageElectronicsRepair #ABIChipMasterCompact #DigitalICTester #StudioMelodium #MelodiumStudio #StudioMelodiumMontreuil #MelodiumMontreuil #StudioPiscineATokyo #PiscineATokyo #LeBonDocteurPrager #TheGoodDoctorPrager https://www.instagram.com/p/BspnW9IlM9_/?utm_source=ig_tumblr_share&igshid=19pwvhnrkjixe

. . This is one frequent "Achille's heel" in the #Eventide #H949 #Harmonizer : an almost dead AD7531, one of the two 12-bit DA converters used on the outputs, on the upper digital board. . The one for the Delay Only output (of the H949 of the @melodiumstudio in Montreuil) was effectively distorting the audio at very low levels... and also added a somewhat perceivable background noise all the time 😔 . Now that it's been replaced by a new chip, distortion AND hiss have disappeared. Meaning that the dynamic range of the Delay Only output has returned to its full spec 😊👌 . @eventideaudio @eventidefrance . #EventideInc #EventideAudio #H949Harmonizer #EventideH949 #EventideHarmonizer #EventideH949Harmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #EarlyDigital #Repair #Fix #ElectronicsRepair #VintageElectronicsRepair #StudioMelodium #MelodiumStudio #StudioMelodiumMontreuil #MelodiumMontreuil #StudioPiscineATokyo #PiscineATokyo #LeBonDocteurPrager #TheGoodDoctorPrager https://www.instagram.com/p/BsoeiXQh0X0/?utm_source=ig_tumblr_share&igshid=5cs1mtrfrz4g

@bertrandfresel Studio Juno's H949 fully restored and calibrated. Ready to be picked-up... and played with!!! 😊😊😊😍😍😍 #Eventide #EventideClockworks #H949 #EventideH949 #Harmonizer #H949Harmonizer #EventideHarmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #VintageDigitalDelayLine #EarlyDigital #Restoration #Repair #StudiosJuno #StudioPiscineATokyo #TheGoodDoctorPrager

Another Hard-To-Fix-Faulty-Eventide-Harmonizers vs. Studio-Piscine-à-Tokyo-Workshop Battle won!!! This time: H949: 0 / The Good Doctor Prager: 3 😊😊😊 #Eventide #H949 #EventideH949 #Harmonizer #H949Harmonizer #EventideHarmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #VintageDigitalDelayLine #EarlyDigital #Repair #StudiosJuno #StudioPiscineATokyo #TheGoodDoctorPrager

Fifth H949 (cont'): PSU section rebuilt! :-) #Eventide #H949 #EventideH949 #Harmonizer #H949Harmonizer #EventideHarmonizer #VintageDigitalPitchShifter #VintageHarmonizer #VintageDigitalFXBox #VintageDigitalDelayLine #EarlyDigital #Repair #StudiosJuno #StudioPiscineATokyo #TheGoodDoctorPrager