Yamaha CS80

Hi guys, 

I have some stuff for sale, thought id offer it to the list before going to 
ebay. 

Waldorf Pulse Plus. Upgraded to version 2 os. Original manual and psu, good 
condition, �220. 

Yamaha CS50/60/80 voice card, �120 each. (2 available)
Yamaha CS80 trg board, this has 16 customs yamaha VCA chips on it, �150. 

Some yamaha cs50/60/80 series sliders, 6 quadrant style sliders, 4 normal 
sliders, two switches (black two position), 8 big slider caps, 6 small 
slider caps, �20 for all above. (2 sets available) 

Also have the original Yamaha CS80 schematics, including the huge poster 
size schemo, im not keen on selling it, but if you want it make me a decent 
offer? 

Also selling the last of my spare nos CEM chips: 

2x CEM 3310 vcas, �35. (4 sets of 2 chips available)
1x CEM 3387 vcf/vca and 1x SSM 2044 vcf, �30 for both.
1x CEM 3310 vca and 1x CEM 3320 vcf, �30 for both. (4 sets of 2 chips 
available)
2x CEM 3387 vcf/vca, �40 for both. (2 sets of 2 available) 

Please email me offlist if interested, thanks.. 

Regards,
Rob Belcher
www.myspace.com/duplx

Hi Rob,

do you happen to have knob caps and pots for a Prophet 5?

Cheers,

Stephen.

____________________________________________________________________

"Ambition makes you look pretty ugly, kicking squealing Gucci little piggy." (Thom Yorke/Radiohead -- "Paranoid Android") 

Finally available: Stephen Parsick -- Traces of the Past Redux, reissued with three previously unreleased bonus tracks.

It´s out: [´ramp] & markus reuter -- "ceasing to exist", a gorgeous dark ambient album. available through our webshop at www.doombient.com

For info and audio, please visit the official [´ramp] website at www.doombient.com

  ----- Original Message ----- 
  From: blchrr@... 
  To: Analogue Heaven! 
  Cc: CS80Group 
  Sent: Saturday, October 13, 2007 6:46 PM
  Subject: [yamahacs80] FS: Various stuff/ CS80 parts/ CEMs/ Pulse +


  Hi guys, 

  I have some stuff for sale, thought id offer it to the list before going to 
  ebay. 

  Waldorf Pulse Plus. Upgraded to version 2 os. Original manual and psu, good 
  condition, £220. 

  Yamaha CS50/60/80 voice card, £120 each. (2 available)
  Yamaha CS80 trg board, this has 16 customs yamaha VCA chips on it, £150. 

  Some yamaha cs50/60/80 series sliders, 6 quadrant style sliders, 4 normal 
  sliders, two switches (black two position), 8 big slider caps, 6 small 
  slider caps, £20 for all above. (2 sets available) 

  Also have the original Yamaha CS80 schematics, including the huge poster 
  size schemo, im not keen on selling it, but if you want it make me a decent 
  offer? 

  Also selling the last of my spare nos CEM chips: 

  2x CEM 3310 vcas, £35. (4 sets of 2 chips available)
  1x CEM 3387 vcf/vca and 1x SSM 2044 vcf, £30 for both.
  1x CEM 3310 vca and 1x CEM 3320 vcf, £30 for both. (4 sets of 2 chips 
  available)
  2x CEM 3387 vcf/vca, £40 for both. (2 sets of 2 available) 

  Please email me offlist if interested, thanks.. 

  Regards,
  Rob Belcher
  www.myspace.com/duplx 



   

[Non-text portions of this message have been removed]

Hi Stephen, 

Im sure i replied to you email before, but just to be sure. I dont have any 
Prophet 5 parts for sale, sorry.. 

Cheers,
Rob. 

> Hi Rob, 
> 
> do you happen to have knob caps and pots for a Prophet 5? 
> 
> Cheers, 
> 
> Stephen. 
> 
> ____________________________________________________________________ 
> 
> "Ambition makes you look pretty ugly, kicking squealing Gucci little piggy." (Thom Yorke/Radiohead -- "Paranoid Android")  
> 
> Finally available: Stephen Parsick -- Traces of the Past Redux, reissued with three previously unreleased bonus tracks. 
> 
> It�s out: [�ramp] & markus reuter -- "ceasing to exist", a gorgeous dark ambient album. available through our webshop at www.doombient.com 
> 
> For info and audio, please visit the official [�ramp] website at www.doombient.com 
> 
>   ----- Original Message ----- 
>   From: blchrr@... 
>   To: Analogue Heaven! 
>   Cc: CS80Group 
>   Sent: Saturday, October 13, 2007 6:46 PM
>   Subject: [yamahacs80] FS: Various stuff/ CS80 parts/ CEMs/ Pulse + 
> 
> 
>   Hi guys,  
> 
>   I have some stuff for sale, thought id offer it to the list before going to 
>   ebay.  
> 
>   Waldorf Pulse Plus. Upgraded to version 2 os. Original manual and psu, good 
>   condition, �220.  
> 
>   Yamaha CS50/60/80 voice card, �120 each. (2 available)
>   Yamaha CS80 trg board, this has 16 customs yamaha VCA chips on it, �150.  
> 
>   Some yamaha cs50/60/80 series sliders, 6 quadrant style sliders, 4 normal 
>   sliders, two switches (black two position), 8 big slider caps, 6 small 
>   slider caps, �20 for all above. (2 sets available)  
> 
>   Also have the original Yamaha CS80 schematics, including the huge poster 
>   size schemo, im not keen on selling it, but if you want it make me a decent 
>   offer?  
> 
>   Also selling the last of my spare nos CEM chips:  
> 
>   2x CEM 3310 vcas, �35. (4 sets of 2 chips available)
>   1x CEM 3387 vcf/vca and 1x SSM 2044 vcf, �30 for both.
>   1x CEM 3310 vca and 1x CEM 3320 vcf, �30 for both. (4 sets of 2 chips 
>   available)
>   2x CEM 3387 vcf/vca, �40 for both. (2 sets of 2 available)  
> 
>   Please email me offlist if interested, thanks..  
> 
>   Regards,
>   Rob Belcher
>   www.myspace.com/duplx  
> 
>  
> 
>     
> 
> [Non-text portions of this message have been removed] 
> 
 


Regards,
Rob Belcher
www.myspace.com/duplx

hi folks, i wanted to ask why a particular mod has never been discussed, or done, to my knowledge on CS80's. hoping for some practical answers, to see if i consider should setting out on this.

it seems like it would be relatively easy to detach the PSU from the CS80, and make it an external unit. im assuming that most(if not all) of the reknowned pitch instability/temperature issues were due to the massive PSU/input transformer. after seeing this firsthand, i see there are just two harnesses and a ground wire that connect to the rest of the synth. it seems like it would be pretty easy to take the PSU out, install 1 or 2 connectors to adapt the harnesses to, and build an external box for the PSU. there cant be more than 16-18 total harness pins for the rails of the PSU. by now, im sure every cs80 in existence is a studio unit, and this wouldnt be too inconvenient, and could potentially help the stability. of course, the connector would have to be a screw-in type that could be well secured to the chassis.

is there a reason this hasnt been done, or has this been covered already, and a terrible idea for some reason? thanks guys!

 __________________________________________________
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Tired of spam?  Yahoo! Mail has the best spam protection around 
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[Non-text portions of this message have been removed]

I've never done this (in fact, my CS-80 isn't even in my home yet), but I'll 
offer one thought nevertheless:

The GND impedance may be a problem.

Linear VCOs are very sensitive to small offset voltages in the low frequency 
range, so a voltage drop across the GND connection may be a problem. I have 
that theory, which isn't any more than a gut feeling right now, and may be 
totally wrong, that the slight coupling via voltage drop *inside* the CS-80 
may play a role in it's increadible lush-ness - then a longer GND path might 
turn the feature into a problem.
But then again there's a servo sensing for the PSU regulation if memory 
serves - that would *allow* a rmote PSU (with sense and power wires both 
going thru the umbilical cord).

JH.

----- Original Message ----- 
From: "rj krohn" <r_j_d_2.phila@...>
To: <yamahacs80@yahoogroups.com>
Sent: Tuesday, November 06, 2007 7:31 PM
Subject: [yamahacs80] CS80 PSU mod-anyone ever done this?


hi folks, i wanted to ask why a particular mod has never been discussed, or 
done, to my knowledge on CS80's. hoping for some practical answers, to see 
if i consider should setting out on this.

it seems like it would be relatively easy to detach the PSU from the CS80, 
and make it an external unit. im assuming that most(if not all) of the 
reknowned pitch instability/temperature issues were due to the massive 
PSU/input transformer. after seeing this firsthand, i see there are just two 
harnesses and a ground wire that connect to the rest of the synth. it seems 
like it would be pretty easy to take the PSU out, install 1 or 2 connectors 
to adapt the harnesses to, and build an external box for the PSU. there cant 
be more than 16-18 total harness pins for the rails of the PSU. by now, im 
sure every cs80 in existence is a studio unit, and this wouldnt be too 
inconvenient, and could potentially help the stability. of course, the 
connector would have to be a screw-in type that could be well secured to the 
chassis.

is there a reason this hasnt been done, or has this been covered already, 
and a terrible idea for some reason? thanks guys!

 __________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

[Non-text portions of this message have been removed]




Yahoo! Groups Links

ahhhh, thanks for the thought, JH. that makes sense. i would rather not pioneer a mod on a synth that is as rare as this, but it seems to be very sensible and almost simple. im envisioning nothing more than a 3-5 ft umbilical-style cord with a multi-pin connector that screws in(my trident console has one that would work perfectly), mounted in the base of the chassis, right where the PSU is now. then you could set the psu on the floor within a few feet of the base of the chassis(of course mounted in its own chassis!).

i wonder, how much impedance could be lost between 8" and 5'? (i guess thats a question for my multimeter.)



"JH." <jhaible@...> wrote:                               I've never done this (in fact, my CS-80 isn't even in my home yet), but I'll 
 offer one thought nevertheless:
 
 The GND impedance may be a problem.
 
 Linear VCOs are very sensitive to small offset voltages in the low frequency 
 range, so a voltage drop across the GND connection may be a problem. I have 
 that theory, which isn't any more than a gut feeling right now, and may be 
 totally wrong, that the slight coupling via voltage drop *inside* the CS-80 
 may play a role in it's increadible lush-ness - then a longer GND path might 
 turn the feature into a problem.
 But then again there's a servo sensing for the PSU regulation if memory 
 serves - that would *allow* a rmote PSU (with sense and power wires both 
 going thru the umbilical cord).
 
 JH.

 ----- Original Message ----- 
 From: "rj krohn" <r_j_d_2.phila@...>
 To: <yamahacs80@yahoogroups.com>
 Sent: Tuesday, November 06, 2007 7:31 PM
 Subject: [yamahacs80] CS80 PSU mod-anyone ever done this?
 
 hi folks, i wanted to ask why a particular mod has never been discussed, or 
 done, to my knowledge on CS80's. hoping for some practical answers, to see 
 if i consider should setting out on this.
 
 it seems like it would be relatively easy to detach the PSU from the CS80, 
 and make it an external unit. im assuming that most(if not all) of the 
 reknowned pitch instability/temperature issues were due to the massive 
 PSU/input transformer. after seeing this firsthand, i see there are just two 
 harnesses and a ground wire that connect to the rest of the synth. it seems 
 like it would be pretty easy to take the PSU out, install 1 or 2 connectors 
 to adapt the harnesses to, and build an external box for the PSU. there cant 
 be more than 16-18 total harness pins for the rails of the PSU. by now, im 
 sure every cs80 in existence is a studio unit, and this wouldnt be too 
 inconvenient, and could potentially help the stability. of course, the 
 connector would have to be a screw-in type that could be well secured to the 
 chassis.
 
 is there a reason this hasnt been done, or has this been covered already, 
 and a terrible idea for some reason? thanks guys!
 
 __________________________________________________
 Do You Yahoo!?
 Tired of spam?  Yahoo! Mail has the best spam protection around
 http://mail.yahoo.com
 
 [Non-text portions of this message have been removed]
 
 Yahoo! Groups Links
 
 
     
                               

 __________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

[Non-text portions of this message have been removed]

fwiw, i went down the route of modding the cs80 with some external fx built 
into the unit... (changing the Cs80 chorus for a dc-2 circuit and changing 
the tremolo circuit for a PH-3 circuit)
it was a BAD idea, DO NOT mod classic synths, leave them as they are...
Fortunately i only modified (drilled for extra pots) the modulation panel, i 
managed to source another modulation panel and am changing it back 
completely to a standard unit...
My own fault... but my answer is DONT modify the Cs80, work with what you 
have... 

> ahhhh, thanks for the thought, JH. that makes sense. i would rather not pioneer a mod on a synth that is as rare as this, but it seems to be very sensible and almost simple. im envisioning nothing more than a 3-5 ft umbilical-style cord with a multi-pin connector that screws in(my trident console has one that would work perfectly), mounted in the base of the chassis, right where the PSU is now. then you could set the psu on the floor within a few feet of the base of the chassis(of course mounted in its own chassis!). 
> 
> i wonder, how much impedance could be lost between 8" and 5'? (i guess thats a question for my multimeter.) 
> 
>  
> 
> "JH." <jhaible@...> wrote:                               I've never done this (in fact, my CS-80 isn't even in my home yet), but I'll 
>  offer one thought nevertheless:
>  
>  The GND impedance may be a problem.
>  
>  Linear VCOs are very sensitive to small offset voltages in the low frequency 
>  range, so a voltage drop across the GND connection may be a problem. I have 
>  that theory, which isn't any more than a gut feeling right now, and may be 
>  totally wrong, that the slight coupling via voltage drop *inside* the CS-80 
>  may play a role in it's increadible lush-ness - then a longer GND path might 
>  turn the feature into a problem.
>  But then again there's a servo sensing for the PSU regulation if memory 
>  serves - that would *allow* a rmote PSU (with sense and power wires both 
>  going thru the umbilical cord).
>  
>  JH.
>  
>  ----- Original Message ----- 
>  From: "rj krohn" <r_j_d_2.phila@...>
>  To: <yamahacs80@yahoogroups.com>
>  Sent: Tuesday, November 06, 2007 7:31 PM
>  Subject: [yamahacs80] CS80 PSU mod-anyone ever done this?
>  
>  hi folks, i wanted to ask why a particular mod has never been discussed, or 
>  done, to my knowledge on CS80's. hoping for some practical answers, to see 
>  if i consider should setting out on this.
>  
>  it seems like it would be relatively easy to detach the PSU from the CS80, 
>  and make it an external unit. im assuming that most(if not all) of the 
>  reknowned pitch instability/temperature issues were due to the massive 
>  PSU/input transformer. after seeing this firsthand, i see there are just two 
>  harnesses and a ground wire that connect to the rest of the synth. it seems 
>  like it would be pretty easy to take the PSU out, install 1 or 2 connectors 
>  to adapt the harnesses to, and build an external box for the PSU. there cant 
>  be more than 16-18 total harness pins for the rails of the PSU. by now, im 
>  sure every cs80 in existence is a studio unit, and this wouldnt be too 
>  inconvenient, and could potentially help the stability. of course, the 
>  connector would have to be a screw-in type that could be well secured to the 
>  chassis.
>  
>  is there a reason this hasnt been done, or has this been covered already, 
>  and a terrible idea for some reason? thanks guys!
>  
>  __________________________________________________
>  Do You Yahoo!?
>  Tired of spam?  Yahoo! Mail has the best spam protection around
>  http://mail.yahoo.com
>  
>  [Non-text portions of this message have been removed]
>  
>  Yahoo! Groups Links
>  
>  
>      
>                                 
> 
>  __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around 
> http://mail.yahoo.com  
> 
> [Non-text portions of this message have been removed] 
> 
 


Regards,
Rob Belcher
www.myspace.com/duplx

thanks for the heads up, rob. you think even steer clear of the internal heatsink approach?

blchrr@... wrote:                               fwiw, i went down the route of modding the cs80 with some external fx built 
 into the unit... (changing the Cs80 chorus for a dc-2 circuit and changing 
 the tremolo circuit for a PH-3 circuit)
 it was a BAD idea, DO NOT mod classic synths, leave them as they are...
 Fortunately i only modified (drilled for extra pots) the modulation panel, i 
 managed to source another modulation panel and am changing it back 
 completely to a standard unit...
 My own fault... but my answer is DONT modify the Cs80, work with what you 
 have... 
 
 > ahhhh, thanks for the thought, JH. that makes sense. i would rather not pioneer a mod on a synth that is as rare as this, but it seems to be very sensible and almost simple. im envisioning nothing more than a 3-5 ft umbilical-style cord with a multi-pin connector that screws in(my trident console has one that would work perfectly), mounted in the base of the chassis, right where the PSU is now. then you could set the psu on the floor within a few feet of the base of the chassis(of course mounted in its own chassis!). 
 > 
 > i wonder, how much impedance could be lost between 8" and 5'? (i guess thats a question for my multimeter.) 
 > 
 >  
 > 
 > "JH." <jhaible@...> wrote:                               I've never done this (in fact, my CS-80 isn't even in my home yet), but I'll 
 >  offer one thought nevertheless:
 >  
 >  The GND impedance may be a problem.
 >  
 >  Linear VCOs are very sensitive to small offset voltages in the low frequency 
 >  range, so a voltage drop across the GND connection may be a problem. I have 
 >  that theory, which isn't any more than a gut feeling right now, and may be 
 >  totally wrong, that the slight coupling via voltage drop *inside* the CS-80 
 >  may play a role in it's increadible lush-ness - then a longer GND path might 
 >  turn the feature into a problem.
 >  But then again there's a servo sensing for the PSU regulation if memory 
 >  serves - that would *allow* a rmote PSU (with sense and power wires both 
 >  going thru the umbilical cord).
 >  
 >  JH.
 >  
 >  ----- Original Message ----- 
 >  From: "rj krohn" <r_j_d_2.phila@...>
 >  To: <yamahacs80@yahoogroups.com>
 >  Sent: Tuesday, November 06, 2007 7:31 PM
 >  Subject: [yamahacs80] CS80 PSU mod-anyone ever done this?
 >  
 >  hi folks, i wanted to ask why a particular mod has never been discussed, or 
 >  done, to my knowledge on CS80's. hoping for some practical answers, to see 
 >  if i consider should setting out on this.
 >  
 >  it seems like it would be relatively easy to detach the PSU from the CS80, 
 >  and make it an external unit. im assuming that most(if not all) of the 
 >  reknowned pitch instability/temperature issues were due to the massive 
 >  PSU/input transformer. after seeing this firsthand, i see there are just two 
 >  harnesses and a ground wire that connect to the rest of the synth. it seems 
 >  like it would be pretty easy to take the PSU out, install 1 or 2 connectors 
 >  to adapt the harnesses to, and build an external box for the PSU. there cant 
 >  be more than 16-18 total harness pins for the rails of the PSU. by now, im 
 >  sure every cs80 in existence is a studio unit, and this wouldnt be too 
 >  inconvenient, and could potentially help the stability. of course, the 
 >  connector would have to be a screw-in type that could be well secured to the 
 >  chassis.
 >  
 >  is there a reason this hasnt been done, or has this been covered already, 
 >  and a terrible idea for some reason? thanks guys!
 >  
 >  __________________________________________________
 >  Do You Yahoo!?
 >  Tired of spam?  Yahoo! Mail has the best spam protection around
 >  http://mail.yahoo.com
 >  
 >  [Non-text portions of this message have been removed]
 >  
 >  Yahoo! Groups Links
 >  
 >  
 >      
 >                                 
 > 
 >  __________________________________________________
 > Do You Yahoo!?
 > Tired of spam?  Yahoo! Mail has the best spam protection around 
 > http://mail.yahoo.com  
 > 
 > [Non-text portions of this message have been removed] 
 > 
  
 
 Regards,
 Rob Belcher
 www.myspace.com/duplx 
 
     
                               

 __________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

[Non-text portions of this message have been removed]

rj krohn wrote:
> hi folks, i wanted to ask why a particular mod has never been
discussed, or done, to my knowledge on CS80's. hoping for some practical
answers, to see if i consider should setting out on this.
>
> it seems like it would be relatively easy to detach the PSU from the
CS80, and make it an external unit. im assuming that most(if not all) of
the reknowned pitch instability/temperature issues were due to the
massive PSU/input transformer.
 
RJ - thanks for bringing up an interesting topic.  I'd really like to
see other techy-oriented people to suggest things like this or talk
about mods they've done/seen/thought of.  That said, I'm having trouble
with the remote power supply for a few reasons.  First, why?  I don't
agree that the PS is the source of tuning problems. To enter rant mode
for a second, the whole "cs80s have unstable tuning" is blown way out of
proportion. It was quoted in a couple of articles and is now considered
gospel. Given that, I think most tuning issues are from heat and most
noticeable in earlier CS80s with the older VCO chips.
 
> after seeing this firsthand, i see there are just two harnesses and a
ground wire that connect to the rest of the synth. it seems like it
would be pretty easy to take the PSU out, install 1 or 2 connectors to
adapt the harnesses to, and build an external box for the PSU. there
cant be more than 16-18 total harness pins for the rails of the PSU. by
now, im sure every cs80 in existence is a studio unit, and this wouldnt
be too inconvenient, and could potentially help the stability. of
course, the connector would have to be a screw-in type that could be
well secured to the chassis.
 
I have to agree that voltage drop will kill you.  The supplies have
sense lines, so you'd need three wires for each voltage: a big hot, a
big ground (you'd need separate grounds to have the sensing work right -
which might require modifying the PS), and a sense line.  Lots of big
wires!  Ever see the remote PS in the Kurzweil K250?  Huge cable, lots
of pins, connector was big (and probably expensive).
 
What might work is remoting the main PS, but keeping the regulators in
the case.  But then again, why?  To make it lighter :^)

 David

Well, I certainly love the mods on my CS-50:

Bringing out the CVs and Gates, and a 5th, monophonic gate.
I derive the highest and lowest note from that externally, run it thru a log 
converter, and control two V/Oct monosynths that double the lead and bass 
line.
And I have 4 LEDs for the Gates (externally) that are increadibly helpful 
for tuning the synth.
Also, I re-routed the Suboscillator Sine wave to the aftertouch->VCO path. 
that way I can add sine vibrato by aftertouch, and still can use other 
sources (like noise, or the synth's main output fed back to the external 
input) for VCF and VCA.
Also, I bring out the Aftertouch, the Sub Oscillator, the PWM oscillator and 
the Ring Mod oscillator for external use.
It's nice to sweep a VC Phaser by Aftertouch, or to do some VC stereo 
panning along with the PWM ...

I wouldn't build any FX device into the synth, though. There's so many 
differend FX boxes I want to try, so it's a good thing to have them 
separately.

JH.

----- Original Message ----- 
From: <blchrr@...>
To: <yamahacs80@yahoogroups.com>
Sent: Tuesday, November 06, 2007 11:01 PM
Subject: [yamahacs80] Re: CS80 PSU mod-anyone ever done this?


fwiw, i went down the route of modding the cs80 with some external fx built
into the unit... (changing the Cs80 chorus for a dc-2 circuit and changing
the tremolo circuit for a PH-3 circuit)
it was a BAD idea, DO NOT mod classic synths, leave them as they are...
Fortunately i only modified (drilled for extra pots) the modulation panel, i
managed to source another modulation panel and am changing it back
completely to a standard unit...
My own fault... but my answer is DONT modify the Cs80, work with what you
have...

> ahhhh, thanks for the thought, JH. that makes sense. i would rather not 
> pioneer a mod on a synth that is as rare as this, but it seems to be very 
> sensible and almost simple. im envisioning nothing more than a 3-5 ft 
> umbilical-style cord with a multi-pin connector that screws in(my trident 
> console has one that would work perfectly), mounted in the base of the 
> chassis, right where the PSU is now. then you could set the psu on the 
> floor within a few feet of the base of the chassis(of course mounted in 
> its own chassis!).
>
> i wonder, how much impedance could be lost between 8" and 5'? (i guess 
> thats a question for my multimeter.)
>
>
>
> "JH." <jhaible@...> wrote:                               I've 
> never done this (in fact, my CS-80 isn't even in my home yet), but I'll
>  offer one thought nevertheless:
>
>  The GND impedance may be a problem.
>
>  Linear VCOs are very sensitive to small offset voltages in the low 
> frequency
>  range, so a voltage drop across the GND connection may be a problem. I 
> have
>  that theory, which isn't any more than a gut feeling right now, and may 
> be
>  totally wrong, that the slight coupling via voltage drop *inside* the 
> CS-80
>  may play a role in it's increadible lush-ness - then a longer GND path 
> might
>  turn the feature into a problem.
>  But then again there's a servo sensing for the PSU regulation if memory
>  serves - that would *allow* a rmote PSU (with sense and power wires both
>  going thru the umbilical cord).
>
>  JH.
>
>  ----- Original Message ----- 
>  From: "rj krohn" <r_j_d_2.phila@...>
>  To: <yamahacs80@yahoogroups.com>
>  Sent: Tuesday, November 06, 2007 7:31 PM
>  Subject: [yamahacs80] CS80 PSU mod-anyone ever done this?
>
>  hi folks, i wanted to ask why a particular mod has never been discussed, 
> or
>  done, to my knowledge on CS80's. hoping for some practical answers, to 
> see
>  if i consider should setting out on this.
>
>  it seems like it would be relatively easy to detach the PSU from the 
> CS80,
>  and make it an external unit. im assuming that most(if not all) of the
>  reknowned pitch instability/temperature issues were due to the massive
>  PSU/input transformer. after seeing this firsthand, i see there are just 
> two
>  harnesses and a ground wire that connect to the rest of the synth. it 
> seems
>  like it would be pretty easy to take the PSU out, install 1 or 2 
> connectors
>  to adapt the harnesses to, and build an external box for the PSU. there 
> cant
>  be more than 16-18 total harness pins for the rails of the PSU. by now, 
> im
>  sure every cs80 in existence is a studio unit, and this wouldnt be too
>  inconvenient, and could potentially help the stability. of course, the
>  connector would have to be a screw-in type that could be well secured to 
> the
>  chassis.
>
>  is there a reason this hasnt been done, or has this been covered already,
>  and a terrible idea for some reason? thanks guys!
>
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Regards,
Rob Belcher
www.myspace.com/duplx



Yahoo! Groups Links

Duh.  Were you the guy who wanted to put a Dimension D in your CS80?  I stop the mods at Midi.



it was a BAD idea, DO NOT mod classic synths, leave them as they are...

Fortunately i only modified (drilled for extra pots) the modulation panel, i 

managed to source another modulation panel and am changing it back 

completely to a standard unit...

My own fault... but my answer is DONT modify the Cs80, work with what you 

have... 


    




















[Non-text portions of this message have been removed]

Read my email. Thats what i said. I said its not a good idea based on my 
experience putting the dimension d into it..
Im modifying back to stock unit now just with kenton midi, managed to source 
a used modulation panel, so my 80 is as new.. 

>  
> 
> Duh.  Were you the guy who wanted to put a Dimension D in your CS80?  I stop the mods at Midi. 
> 
>  
> 
> it was a BAD idea, DO NOT mod classic synths, leave them as they are... 
> 
> Fortunately i only modified (drilled for extra pots) the modulation panel, i  
> 
> managed to source another modulation panel and am changing it back  
> 
> completely to a standard unit... 
> 
> My own fault... but my answer is DONT modify the Cs80, work with what you  
> 
> have...  
> 
> 
>      
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>  
> 
>  
> 
>  
> 
>  
> 
>  
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> [Non-text portions of this message have been removed] 
> 
 


Regards,
Rob Belcher
www.myspace.com/duplx

sorry, guys, think there's some confusion here. im NOT the guy w/ the dimension d mod. i'll restate my initial CONCEPT here....

if HEAT=TUNING INSTABILITY, and BIG PSU=HEAT, wouldnt, in theory, taking the PSU out of the chassis of a cs-80 HELP stability? 

i am currently recapping my PSU-looking at it, its actually a pretty simple unit for a PSU; it has a total of 13 rails that run the the rest of the synth. the concept(which is still just in CONCEPTUAL stage), would be to install a SOLID, screw-in-type connector on the bottom of the chassis, take the PSU out and install it in a small box/case, and run those 13 leads through a short umbilical cord to the chassis of the cs80.

again, im just thinking out loud, but i have yet to come to any conclusions why this wouldnt work, other than the previously mentioned impedance issue(which i think a short run-5 ft or less-would solve). please chime in with any thoughts.

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