[sdiy] Moog ladder filter transistor pairs matched or not..??

[Michael E Caloroso]

If you're only using it in a monophonic system, you can get away with
the top and bottom matched pairs.

The minute you use it in a polyphonic system, you need all 5 pairs
matched or the resonance will not match between voices.

MC

On 2/18/14, Gordon JC Pearce <gordonjcp at gjcp.net> wrote:
> On Tue, Feb 18, 2014 at 09:12:22AM -0500, Jean-Pierre Desrochers wrote:
>> You are probably right Tom,
>> I remember now reading something like what you just stated..
>> In fact what I need to know for my future projects
>> is what are the 'picky' transistors that absolutely need matching..
>> in that design. I don't care spending some time
>> on my tranny matching rig to make sure the VCF
>> works as it's supposed to.
>>
>> JP
>
> Having tried matching diodes and transistors, I have come to the conclusion
> that - particularly with cheap Chinese parts bought for pennies per hundred
> - any random two you pull out of the bag will be Pretty Damn Close.
>
> --
> Gordonjcp MM0YEQ
>
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