Re: Replacement of tcl272

Is an  ECC83 better than a 6SN7 ?
Joke!
John

On Thu, Aug 27, 2015 at 3:24 AM, Stefan Jung <[email protected]> wrote:

> Hi Eric
>
> No you can't use a LM301, LM348, LM741, 324, 709, etc.  That would be like
> fitting a spoked, wooden rimmed, road wheel to a Porsche, it wouldn't
> work.  You might as well try an ECC83 - a dual triode valve, for those that
> don't know.
>
> You need an opamp that:
>
> (1) is LOW NOISE (!!!!!)
>
> (2) Has a high input impedance, that means using some sort of FET-input
> opamp.
>
> (3) Can run from a 5V supply.  Most of Noah's Arc opamps can only run from
> about 10-16 or so volts minimum.
>
> (4) Not so important, but you preferably want to use a low power opamp;
> typically drawing not more than 1mA per opamp (just in case you want to
> run from batteries).  This means you will select a relatively slow (for
> todays standard, not Noah's) opamp.
>
> Because you run at unity gain, offset voltages are not important in your
> application.  Rail-to-rail is also not a requirement.
>
> There are many newer and better devices than the TLC272, but if you can't
> get a TLC272, I would just be wasting my time listing more modern (and
> likely more expensive) devices.
>
> Regards
> Stefan
>
>
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