[sdiy] Resistor War !!!

[harry]

MHO:

Metal film resistors in large values have a spiral wound film that can have
oh-so-little inductance compared to a carbon film.

That said I doubt you could prove a difference in the audio range.

Metal Film =
very high accuracy and stability over time
very low noise
poor peak power handling (joules)
very slight inductance

Carbon Film (most common today)
Not so good stability
Not so good noise
poor peak power handling

Carbon Comp (very uncommon today)
Not so good stability
Not so good noise
Excellent peak power handling

Today, the repacement for carbon comp in low values
is Carborundum (Globar) or the new Bulk Cermet, which
have almost no inductance (same as carbon comp) and
excellent power handling.

Moog used what was cheap and plentiful at the time. Metal films
were $1, carbon comp $.02... that is the opposite now!

H^) harry

Dave Krooshof wrote:

> I virtually came across a Four Panel Serge Modular System.
>
> ----------------
> "It is a very early system which was handmade by Serge himself.
> It is a very expressive instrument."
> Panel  (1)
>     Dual Processor, 10 Step Sequencer, Mults, Envelope Generator,
>     Positive Slew, Negative Slew
> Panel  (2)
>     Negative Slew, Programmer, Programmer, Peak Through
> Panel  (3), Mults, Filter  HP  LP  BP, Filter  HP  LP  BP, Ring Modulator
>     3 Gates, Dual Mixer, Bi-Directional Router
> Panel  (4)
>     3 Oscillators, Schmitt Trigger, Triple Wave Shaper, Dual Mixer, Mults
> ----------------
>
> I have a few questions on this apparatus.
> - what do you guys think of Serge's work?
> - Are Mults = Multipliers?
>
> "Also the super high quality metal resistors clamp down the harmonics
> so I would use hand matched carbon resistors like they did on the old Moogs"
> With the risk of starting a resistor war here, is this true?
> Resistors shouldn't behave different at different freqs in the audio range,
> should they? Or is the resistance of carbon that different at HF?
> This could as well mean less and more HF, depending on the place in a circuit.
>
> Dave
>
> --------------------------------------------
> Dave Krooshof http://www.xs4all.nl/~krooshof
> geluidstechnicus @ http://www.ahk.nl/the/theatertechniek_ov.html
> webmaster: http://www.popronde.nl
> -------------------------------------------