Einen habe ich noch.
Grenzfrequenz schrieb:
Der Sound ist exakt 303, nur etwas cleaner. Anderer Transistor im VCA.
Über Die anderen Transistoren hatte Brian Castro mal folgendes geschrieben.
The layout is a mirror of the TB-303. Whether or not this is necessary to achieve that raw 303 sound is debatable, but I will say we never got 100% there until we did.
If one follows the lineage of the semiconductor manufacturers they would find that all of the original parts are still available even as of today. For example, the fab for 2SC536 from sanyo was passed to motorola and then merged to what became ON Semiconductor. The current part 2SC536NF is the exact same part with ROHS certification.
Another example is the 2SC1583, if you're a design engineer and spec parts for a living you will find quickly that there is another component from the same fab that is end-of-life but ROHS compliant and still readily available. It comes in a SIP5 case as opposed to ZIP5. It is just as cost effective as the SMD counterpart.
Just like the transistors, the original electrolytic capacitors from United Chemi-Con are also still available, and are about the same price as SMD parts. The only question is why wouldn't you use them.
We found that using the original transformer and power supply design is critical, so we spec'd it and had it remade. The part is very cheap. In fact using the original transformer along with corresponding diodes, resistors, transistors and caps to faithfully reproduce the discrete boost converter is cheaper than implementing a DC converter IC. Again the question is why wouldn't we?
It was important to use carbon film resistors to achieve the exact 303 sound we required, and there isn't an equivalent in the SMD world. This was actually one of the major factors in going through-hole. I will say as the design engineer I don't have any emperical evidence per se as to why except as to say A/B'ing various designs convinced me it was necessary.
There are SMD equivalents for the common base and common emitter transistor pairs but they are not sorted, and in a few places it is critical to use the correct part to achieve the correct sound without having to adjust resistors. We would have to measure each one on our curve tracer and sort them. Why bother when through-hole exists for the same price?
Any hardware repairs or modifications will be easy now or in the future with through-hole.
Orig.:https://www.gearslutz.com/board/electronic-music-instruments-electronic-music-production/982480-abstrakt-instruments-avalon-analog-bassline-2.html
Denn trotz der klanglichen Ähnlichkeiten ist es irgendwie schon ein ganz anderes Instrument. Diese Simplizität der 303 ist ja gerade eine ihrer grundlegendsten Eigenschaften. Aber darauf dürfte es dem threaderstellenden Stiefvater ohnehin nicht ankommen, wenn er schon den Sequenzer eigentlich nicht möchte...
Freu! 
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