[sdiy] lm308 replacement

[houshu at muj.biglobe.ne.jp]

Hello Steve and Jim,

I heard the current Rat uses OP07 instead of LM308.
That makes sense because OP07 is quite slow (Slewrate = 0.3 V/uS) and 
low noise.

Another trial I heard is TL070 or TL080 with large phase compensation 
capacitor, which makes the opamp very slow.  They said the sound is very 
close to the original Rat.

Best,

Sam Hoshuyama

>          Man, that is a tough one...the LM308 was just a real dog when it 
> came to speed....something like .1 V/uS slew rate.  Also, it had super-beta 
> input transistors...if the LM308 was used to make the distortion, you 
> probably will be hard pressed to find something that will sound like 
> it.  If it was just used as an amplifier, well, probably almost anything 
> would do...I would use a FET opamp to sub for it in that case...although, 
> why anybody would use the LM308 as an audio amp I don't know...I suspect 
> you have a real search on your hands.
> 
>          -Jim
> 
> At 03:26 PM 7/22/2003 -0400, Steve Begin wrote:
> >I'm looking to build a proco rat distortion since it seems fairly simple 
> >and well liked...although I'm open to suggestion (I'm looking for a hard 
> >clipping overdrive that isn't particularily noisy).
> >
> >Does anybody know what I could use instead of an LM308?
> >
> >thanks,
> >steve
> 
> 
>