Yamaha CS80

Hi Laurie
I too believe that a bit of effect could spring up because of background noise, it's always a 30 year old analog monster, here though the effect is unnaturally loud...
M 
  ----- Original Message ----- 
  From: Laurie Curry 
  To: yamahacs80@yahoogroups.com 
  Sent: Tuesday, June 10, 2008 5:38 AM
  Subject: Re: [yamahacs80] problem: audible modulations at no playing.


  I believe I also hear some leakage from my RM circuit....
  -----Original message-----
  From: "Max Fazio" faxiomas@...
  Date: Mon, 09 Jun 2008 02:47:54 -0600
  To: yamahacs80@yahoogroups.com
  Subject: [yamahacs80] problem: audible modulations at no playing.

  Hi, writing here for a friend's CS80.
  My friend found a strange problem: when he does set the ringmod's
  speed at full with modulation at full , the sound coming from the
  modulator is quite hearable : the fact is that this sound you can hear
  even without playing anything on the keyboard; same problem happens
  with the SubOScillator: when he sets the speed at full, the sound can
  be heard without any key pressed.
  I believe there must be something wrong with some preamps in OE1 board
  or PRA's muting FETs, my idea is to look at R51/52 to see if is there
  any faulty resistor concerning the Suboscillator.

  Anyway I'm looking for your savvy advices.
  Thx for anyreply.
  M 

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