wrote:
On Wed, 15 Jan 2014 13:54:47 -0600, Califbill
wrote:

wrote:
On Tue, 14 Jan 2014 09:00:42 -0500, Hank wrote:

On 1/13/2014 10:50 PM, Califbill wrote:
Or you be like me that worked with card sorters and pneumatic card readers
with 110 db 3' from the heads, and you are missing certain frequency
ranges. Makes cheap players sound OK.

Nothing beats adjusting hammers on a high speed drum printer printing
lines of e's or dashes.
Maybe that's why my Creative speakers sound so good.
IBM's loudest printer in absolute dBs was the 3211 (2000+ line a
minute train printer) but the band printers may have had a more
irritating sound.
I was very happy to see the 3800 laser printer and the fact that the
DC companies embraced them.

NCR train printer was not as loud as the drum printer during hammer
adjustment. All hammers triggered almost simultaneously.

The 3211 train had separate type slugs for each character and they
were hit from behind into a fixed platten, similar to a typewriter.
Each slug would ring and the 4400 "bells" a second added up to a
heluva racket. That may actually have been the resonant frequency. It
was certainly oppressive. Fortunately you did the adjustment
electronically and there was a way to do it with the cover closed.
The 1100 LPM 1403 train printer was the one that sold for the highest
print quality and that was still the old school adjustment. (Usually
one guy adjusting, one guy watching.
I didn't really work in a shop that was anal about print quality but
we had some.
NIH guys used to have to check every printer every day and they had a
dozen of them. They used "T"s The top bar and the vertical bar had to
line up in both directions, sighting down the page.

NCR had a train printer also. But was more of a buss saw effect. We used
M to check hammers. Wanted line up and even color across the M.