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#1
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Does Anyone have a Schematic for a Sound City Joanna Piano Keyboard?
Mine looks just like this one:
https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... |
#2
Posted to rec.audio.pro
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Does Anyone have a Schematic for a Sound City Joanna PianoKeyboard?
On 5/12/2019 3:16 AM, Paul wrote:
Mine looks just like this one: Â*Â*Â* https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... Oh, nevermind. It works. I just need to clean the key springs, and buy new ones for the ones that are missing. But a weird sounding keyboard for sure! Nothing like that old Italian analog sound! |
#3
Posted to rec.audio.pro
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Does Anyone have a Schematic for a Sound City Joanna PianoKeyboard?
On 5/13/2019 3:48 AM, Paul wrote:
On 5/12/2019 3:16 AM, Paul wrote: Mine looks just like this one: Â*Â*Â*Â* https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... Â*Â* Oh, nevermind.Â* It works. Â*Â* I just need to clean the key springs, and buy new ones for the ones that are missing. Â*Â* But a weird sounding keyboard for sure!Â* Nothing like that old Italian analog sound! Ok, can I just go to somewhere like Home Depot, and get stock spring, to replace the old, worn out key springs? Like get a long length of it, and cut them to size? Here is a picture of similar Crumar key springs: https://xbs111.files.wordpress.com/2...-springs-2.jpg Thanks for any advice. |
#4
Posted to rec.audio.pro
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Does Anyone have a Schematic for a Sound City Joanna PianoKeyboard?
On 5/13/2019 6:03 AM, Paul wrote:
On 5/13/2019 3:48 AM, Paul wrote: On 5/12/2019 3:16 AM, Paul wrote: Mine looks just like this one: Â*Â*Â*Â* https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... Â*Â*Â* Oh, nevermind.Â* It works. I used to successfully employ heavy guitar strings on Farfisa and Vox organs. They would need to be wound with a metal that could be soldered though, bronze maybe? I later learned that the original busbars and springs on better quality instruments were often gold plated, so I probably caused a lot of destructive wear and tear, but I didnt know and didnt care in those days. I just wanted the thing to work when I needed it. Everything corrodes, but gold on gold is pretty good until it wears through. If theyre gold, it may be worth transplanting old springs from the upper keys to the midrange to preserve the busbar, and kludge the lesser-used contacts. Â*Â*Â* I just need to clean the key springs, and buy new ones for the ones that are missing. Â*Â*Â* But a weird sounding keyboard for sure!Â* Nothing like that old Italian analog sound! Â*Â* Ok, can I just go to somewhere like Home Depot, and get stock spring, to replace the old, worn out key springs?Â* Like get a long length of it, and cut them to size? Â*Â* Here is a picture of similar Crumar key springs: https://xbs111.files.wordpress.com/2...-springs-2.jpg Â*Â* Thanks for any advice. |
#5
Posted to rec.audio.pro
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Does Anyone have a Schematic for a Sound City Joanna PianoKeyboard?
On 5/13/2019 8:45 AM, ChrisG wrote:
On 5/13/2019 6:03 AM, Paul wrote: On 5/13/2019 3:48 AM, Paul wrote: On 5/12/2019 3:16 AM, Paul wrote: Mine looks just like this one: Â*Â*Â*Â* https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... Â*Â*Â* Oh, nevermind.Â* It works. I used to successfully employ heavy guitar strings on Farfisa and Vox organs. They would need to be wound with a metal that could be soldered though, bronze maybe? I later learned that the original busbars and springs on better quality instruments were often gold plated, so I probably caused a lot of destructive wear and tear, but I didnt know and didnt care in those days. I just wanted the thing to work when I needed it. Everything corrodes, but gold on gold is pretty good until it wears through. If theyre gold, it may be worth transplanting old springs from the upper keys to the midrange to preserve the busbar, and kludge the lesser-used contacts. OK, that sounds like a good idea. Heavy guitar strings. I don't think these are gold-plated, but I could be wrong. I just compared them, and the guitar strings are definitely much stiffer, and less pliant, than the original springs, but it looks like it should work. Still, is there a source for the original raw spring material? It would be better, because the stiffer guitar string would definitely affect the action and feel of the keyboard a small bit. But this all answers the question of why there were 10 springs missing in the first place! They were clearly taken from this unit, and put into another keyboard. And I noticed on the Vintage Synth website, that they are selling these springs USED, for about $4 a piece! Hmmmm....no wonder people like to buy old keyboards for the parts only! :/ Â*Â*Â* I just need to clean the key springs, and buy new ones for the ones that are missing. Â*Â*Â* But a weird sounding keyboard for sure!Â* Nothing like that old Italian analog sound! Â*Â*Â* Ok, can I just go to somewhere like Home Depot, and get stock spring, to replace the old, worn out key springs?Â* Like get a long length of it, and cut them to size? Â*Â*Â* Here is a picture of similar Crumar key springs: https://xbs111.files.wordpress.com/2...-springs-2.jpg Â*Â*Â* Thanks for any advice. |
#6
Posted to rec.audio.pro
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ElectroKey - Does Anyone have a Schematic for a Sound City JoannaPiano Keyboard?
While we are at it does anybody have a schematic an ElectroKey piano.
Similar concept to a Wurli - to the point Wurlitzer got them shut down. geoff |
#7
Posted to rec.audio.pro
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Does Anyone have a Schematic for a Sound City Joanna PianoKeyboard?
On 5/13/2019 1:00 PM, Paul wrote:
On 5/13/2019 8:45 AM, ChrisG wrote: On 5/13/2019 6:03 AM, Paul wrote: On 5/13/2019 3:48 AM, Paul wrote: On 5/12/2019 3:16 AM, Paul wrote: Mine looks just like this one: Â*Â*Â*Â* https://www.matrixsynth.com/2017/07/...ty-joanna.html The power switch LED turns on, but nothing on the output. A schematic would sure be helpful.... Â*Â*Â* Oh, nevermind.Â* It works. I used to successfully employ heavy guitar strings on Farfisa and Vox organs. They would need to be wound with a metal that could be soldered though, bronze maybe? I later learned that the original busbars and springs on better quality instruments were often gold plated, so I probably caused a lot of destructive wear and tear, but I didnt know and didnt care in those days. I just wanted the thing to work when I needed it. Everything corrodes, but gold on gold is pretty good until it wears through. If theyre gold, it may be worth transplanting old springs from the upper keys to the midrange to preserve the busbar, and kludge the lesser-used contacts. Â*Â*Â*Â*Â* OK, that sounds like a good idea. Heavy guitar strings.Â* I don't think these are gold-plated, but I could be wrong. Â*Â*Â*Â*Â* I just compared them, and the guitar strings are definitely much stiffer, and less pliant, than the original springs, but it looks like it should work. Â*Â*Â*Â*Â* Still, is there a source for the original raw spring material?Â* It would be better, because the stiffer guitar string would definitely affect the action and feel of the keyboard a small bit. Â*Â*Â*Â*Â* But this all answers the question of why there were 10 springs missing in the first place!Â* They were clearly taken from this unit, and put into another keyboard.Â* And I noticed on the Vintage Synth website, that they are selling these springs USED, for about $4 a piece! Â*Â*Â*Â*Â* Hmmmm....no wonder people like to buy old keyboards for the parts only! Â*Â*Â*Â*Â* :/ Â*Â*Â* I just need to clean the key springs, and buy new ones for the ones that are missing. Â*Â*Â* But a weird sounding keyboard for sure!Â* Nothing like that old Italian analog sound! Â*Â*Â* Ok, can I just go to somewhere like Home Depot, and get stock spring, to replace the old, worn out key springs?Â* Like get a long length of it, and cut them to size? Â*Â*Â* Here is a picture of similar Crumar key springs: https://xbs111.files.wordpress.com/2...-springs-2.jpg Â*Â*Â* Thanks for any advice. Ok, the guitar string idea works great! 0.052"! There isn't really an issue with a difference in the feel of the action, because like most organs, each key is only ON or OFF. There is no velocity information, and most of the forces on the key, come from the thicker main spring of each key, not the thin contact springs. So consequently, I don't feel a difference in the action, on the keys with the guitar string replacement. But I have found two more issues: 1) How do I level the white keys on this unit? 2) The high G# does not decay properly like the other keys. It almost acts like it has the sustain pedal down all the time. So it keeps sustaining while the other keys decay and taper off as they should. It seems like it's some sort of RC time constant, so I will probe, and check the components around this key, and compare them to it's neighboring keys. And advice is greatly appreciated. |
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