They're nuts if they like the 2N4403. I have it used myself
back around 1980 when there was simply nothing better.
Nice quiet devices of that ilk but purpose designed became
popular for a while but are hard to come by these days.
The 2SA1083/4/5 seems to be the most widely available still.
Other candidates are the 2SA970 and 2SA1316.
Rohm's 2SB737 seems to have the lowest intrinsic resistnces
I've ever seen but is no longer manufactured. It also has a
slightly higher Cob and I've seen its influence on higher
frequency THD btw.
Last time you posted on the subject, you said you had a
stash of 2SB737s btw Win. Do you still have them ?
I used to, but haven't seen them in years. I do have a
small bottle of Rohm 2sd786, which are nearly as good.
Lately I've been using bc550 and bc560 in some designs.
The datasheet says r_bb' is about 150 ohms at 3mA, but
I've measured e_n of about 1nV, so r_bb' must be lower,
say 50 - 100 ohms. They can't compare to Rohm's 4 ohms
and 0.55nV, but at least they're easy to get.
