Vintage Synth Repair

Thanks. Serial is 12044. Supposed to get it in a few days so I'll be able to tell what it exactly uses (or do you know be the serial number?)


--- In vintagesynthrepair@yahoogroups.com, "Paulo Palmieri" <paulopalmieri@...> wrote:
>
> Hi Gil,
> 
> Probably there is a variation in the cv voltage that controls the oscillators.
> I experienced similar issues on the osc 1 of a RA Moog model (the first earlier version) and the only thing that solved the problem was replacing the 2n4058 transistors.
> Please, provide more info such like serial number and if your oscillator board has only transistors or 2 ICS SG3821 or CA/LM3046 or 3 UA726 ICs.
> 
> Regards,
> 
> Paulo Palmieri
> 
> 
>   ----- Original Message ----- 
>   From: Gil 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Thursday, June 28, 2012 9:55 AM
>   Subject: [vintagesynthrepair] Minimoog D pitch drifting
> 
> 
>     
>   I'm handling a friend's mini, which acts strangely. The overall pitch (of the entire machine) will change suddenly, up and down, not to far from the correct pitch but a few semitones... It affects all oscillators at the same time. Is this a known issue in old minimoogs? I would usually suspect either power supply main voltage instability, bad caps or transistors, but being it affecting all 3 oscillators, I tend to think it is not oscillator circuit related ? :/ I'm new to minimoogs so any help would be appreciated... Thanks !
>