[sdiy] replacing a transformer, was:Re: (no subject)

[Werner Flügel]

Am 07.03.2017 um 14:24 schrieb Rutger Vlek:
> By the way, slightly related, but not to PSU. I found some beautiful early 
> transistors (2SC183) in the unit, made by NEC (Nippon) in a very peculiar 
> package (I believe it's called TO-51). Unfortunately most of them died. 
> Replacing them with 2N3904's works well. However, I was curious about how others 
> feel about the sonic character of a divider organ architecture. 

If they are really in the divider (Flipflop) there should be no
difference at all, as a squarewave is a squarewave ;-) In other circuits
(filter, VCA or similar) there could be a difference.


> Do you source 
> specific transistors to maintain it's sound? I could not hear any audible 
> differences between notes playing through working 2SC183's and 2N3904's, so in 
> this case the organ seems fairly insensitive to transistor choice for it's 
> oscillators and dividers.

I think that there would be no audible difference even if you change the
dividers by integrated dividers (CD4024 or so), as long as the signals
remain at the same level. But who wants ICs in an antique organ... ;-)

-- 
mfG.

W.Flügel