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One hell of a restoration project... (cont') . Fresh-new (and greased) bushings and key supports reinstalled with their spring, then levelled, tested and adjusted: keyboard feels fine so far! 😊 . #SequentialCircuits #SequentialCircuitsInc #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
(back to) One hell of a restoration project... (cont') . Now on to the keybaord: a restoration project in its own right! After having cleaned the keybed and the keys themselves, now's the time to clean all the remaining hardware... and there are LOTS if it! . #SequentialCircuits #SequentialCircuitsInc #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
One hell of a restoration project... (cont') New labels for the newly burned v5.2C software EPROMs: looks somewhat neater with these, right? 😊 #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
One hell of a restoration project... (cont') Brand-new 60-way HE10 PCB male header for the CPU board. This one carries the most important control signals from the processor and the front panel pots and switches to the synthesizing voices (and back, for the auto-tune function). Solder joints need to be in good shape (that is, not dry) in order to transfer the analog voltages correctly (this is especially mandatory for pitch control signals, where a change of one thenth of a volt can lead to variation of a semitone or even more in pitch...). #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
One hell of a restoration project... (cont') A brand-new 60-way ribbon cable just built (with high quality, genuine 3M parts) for connecting PCB4 and PCB3 together, to replace the (almost) 40 years-old, brittle one 😊 #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
Cleaning all 61 black and white keys of this P-5 Pratt&Read keyboard using an ultra-sonic bath: MUCH effective indeed! 😊😊👍👍 Anyway, there's always some manual cleaning to add after this kind of bath, in order to remove any dirt traces still present ;-) #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #JWire #VintageSynthesizeKeyboard #PrattReadKeyboard #VintagePrattReadKeyboard #JWireKeyboard #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
One hell of a restoration project... (cont') Control Panel boards ready: both PCBs, their potentiometers and their keyswitches' tops cleaned; IC sockets all replaced; tantalum bypass caps replaced with high-grade, low ESR electrolytics; and, last but not least, brand-new CD4051 MUXes and CD4503 buffers installed. Can't wait for the forthcoming tests!!! 😊 #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
One hell of a restoration project... (cont') CPU & Memory sections of the CPU board are now ready to host the (forthcoming, NOS) eight memory chips, two 2708 EPROMs, and two MC14503 bus drivers ;-) #SequentialCircuits #SCI #Prophet5 #SequentialCircuitsProphet5 #SCIProphet5 #Prophet5Rev1 #VintageAnalogSynthesizer #AnalogSynthesizerRestoration #VintageElectronics #Restoration #Repair #JohanDalgaard #StudioPiscineATokyo #TheGoodDoctorPrager
