[sdiy] ca3280e in germany?

[Tony Allgood]

>  Noo...no...no..no...The LM13700 is not the same as the CA3280.  The
biggest difference is the bias circuitry for the linearinzing diodes...

Jim's totally right here. That linearising network at the front end of
the 3280 is very special if you want to work that input stage very hard.
There is no need to take any input voltages down to mV levels as you
would a 3080. Even with the LM13600's input diodes, you'll still need to
watch your input levels very carefully. I think the top level is around
100mV or so for acceptable distortion with these.

Of course, the problem with either linearising network, once you go
beyond its limits the clipping will be hard and severe.

The 3280 has more in common with R-Ohm's BA6110. Although not
manufactured in SIL anymore, its a great chip to use, and incorporates
its own buffer too. The Gm spec is different though. An Iabc of 1mA will
send the little BA6110 to an early grave. The 3280 is far more rugged
and can take up to several mA, but accordingly you will have to drive it
harder to achieve the same 'gain'.

Regards,

Tony Allgood                       Penrith, Cumbria, England

Oakley Sound Systems                   www.oakleysound.co.uk
Modular projects            www.oakleysound.com/projects.htm