[hank alrich]

geoff wrote:

wrote:
On Nov 6, 2:15 pm, "geoff" wrote:
hank alrich wrote:

Having run his mod'd AKG C460's against the stock item, I call
bull**** on you.

Hell, the front end of a C460 has an LM301 in it, only a FET away
from the capsule ! I would be worried if a schoolkid couldn't
improved that significantly !

;-)

geoff

And just what opamp would you use to replace it with? And which
bipolar transistor? And which coupling caps? And how do you remove the
transformer and still drive a 1200 ohm load? The schoolkids want to
know.
BTW, the 301 is a single package opamp. The 460B uses a TI TL062 dual
fet input device. Good luck getting a single package device to work in
there.

On checking, you are right. I falsely remembered it as an LM301 from last
time I looked. Surely there is a drop-in replacement ( or more recent
manufactured 062) for that, that would give a marginally better performance
? Who said anything about removing the transformer (OK, you might in your
upgrade) . A few replaced electrolytics (esp tantalums) may also give an
improvement.And then one could put bypass caps on those, espcially the
series with output before the transformer...

I know schoolkids who do that sort of thing off their own bats. Admittedly
through folkloric methodology rather than scientific.

The xfrmr in the stock C460 is rather disgusting, and Jim removes it.

--
ha
Iraq is Arabic for Vietnam