18 Mar
2014
18 Mar
'14
10:14 a.m.
----- Original Message -----
Date: Tue, 18 Mar 2014 07:14:36 -0400 (EDT)
From: Steven Hirsch <snhirsch at gmail.com>
On Mon, 17 Mar 2014, MikeS wrote:
----- Reply: -----
Then maybe the step rate is just too fast for those drives? Some systems did
have an option to set the step rate depending on the drive type.
Are the rails immaculately clean, i.e. no unusual friction? Maybe try
exercising one of the drives for a bit to see if that helps...
Any chance it has a jumper setting that puts it
into double-step mode and
emulates a 'normal' 40 track drive (albeit with a narrow head)? AFAIK RPM
and
current would be the same.
Could be, but that doesn't explain why it seems to single-step when a
train of pulses arrive at the max rate, yet double-step when they arrive
individually.
I really hate to write off these two drives. They are incredibly clean
units, probably NOS and were top of the line in their day.
Steve