In article , Arny
Krueger
wrote:
"Jim Lesurf" wrote in message
[snip 12017 discussion]

I guess most people never considered trying it as a general amp due to
the presentation being for RIAA. But I noticed the high rail, low
noise, etc, and found it responded well to being experimented with.
Hence came to prefer it.

It is hard to tell how its noise performance shapes up in professional
applications, and flat response.

Well, the measurements I made led to the spec that the preamp using them
had a SNR of 80dB for MM (RIAA) and 92dB ref to 150mV for line inputs. (And
of course was OK for signals up to 10Vrms, so gave a decent SNR for CD
Audio. Although that did arrive *after* the amp was designed I did have it
in mind.)

As previously explained this was going though three 12017s for RIAA and two
for line inputs. The response was flatter than 0.2dB over 20-20k simply as
a result of the capacitor values, etc, chosen.

I have no quarrel with people using 5534's, etc, though. :-)

Just that from my own experience I'd be inclined to recommend that others
don't dismiss alternatives they haven't actually experimented with for
themself. That way you can easily miss something you might have preferred.
:-)

Oh, and being SIL with a pin gap, the HA12017 can also save space and avoid
incorrect insertions. But that obviously doesn't matter much in most
domestic cases since most space will be for passive components anyway.

Slainte,

Jim

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