The main differences I've found between ring modulators is weather
they are AC coupled or not and how much bleed-through you get from the
program and modulator inputs. The Synthi ring was AC coupled, meaning
when used as a VCA (a DC voltage for the modulator) the Signal would
appear only when the DC was "moving". So a gat inputted there would
make a sound on the rising and falling edges and not when held. These
are the most common ring modulators. The first one I ever used was the
one on a ARP 2500 and if I remember correctly (it was +30 years ago!)
it was combined with a VCA. The circuit is quite simple and that's why
you often see dual versions. As to the bleed-through - I guess you
have to have first hand experience with the unit. Technically when
putting in two sine waves A & B into the unit all you should here on
the output is two tones a+b and a-b. If you hear the originals, that
is the bleed-through. Usually this is at a very low level and not too
much a problem but if you are using it as a pitch doubler (both a and
b the same pitch) then it can get in the way. I would imagine that RMs
in the same price range are very much alike. It cost to make a good
one. To emulate the RM in the Synthi almost any will do - it was not
the best RM out there for sure - mine had lots of bleed-through though
some of that could be blamed on the matrix I'm sure. The Plan-B Model
25 looks very nice. It is a combo unit with a VCA and etc - much like
the ARP 2500's unit. and the ring is DC coupled. I have not hear this
unit but the spec say 65cB of carrier suppression which is very good.

-James

On Feb 10, 2008, at 5:09 AM, johnppp2 wrote:

> I'm still searching on my basic building blocks, anyone point me
> towards the fave Ring Mod I'm still on my EMS style way of thinking
> but if there's more versatile ones out there i'd like to know about
> them.
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> Yahoo! Groups Links
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