With all these discussions about disk heads is there anyone that is
interested in some RK05 heads? I am bidding on a bunch of DEC equipment
tomorrow by noon EST and there are the following that may be in interest to
those that are restoring RK05's etc.
-G938 - G 5 RK05J HEAD POSITION SERVO,DOUBLE X 8.5
-H743 -AA G 1 PWR SUPPLY, H737 REPACKAGE FOR RK05 PLUS
BATTERY,1
30-10863-01 G 10 HEAD,DISC RECORDING,RK05,''B''UP
30-10863-02 G 6 HEAD,DISC RECORDING,RK05,''B''DOWN
30-17108-00 G 2 DISK,PACK RM05CE ALIGNMENT
9883-51 CONTROL DATA
SYSTEMS IN
These are all by line item and quantity shown. If you are interested let me
know off list by 11:30 tomorrow (8/12) as I have to have the bid in by noon.
I will just add it to my current bid. (the entire list is 76 pages)
Dan
-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Wednesday, August 11, 1999 6:47 PM
Subject: Re: Disk flying height
> I watched a support guy clean an RK05 head off with a pocket knife.
> True story.
Wow!. I am impressed (very). Although I often thought some of the stuff
in the RK05 service manual was a little OTT. Those drives _are_ pretty
robust.
(The HP drive that we're discussing here uses similar technology to the
RK05 and will have much the same flying height, etc. So I sould guess
that drive will be similarly robust).
> RK's fly so high they actually ran a year in a machine where the tech
> left the filter caps on.
I assume you mean the dust caps over the ends of the absolute filter and
not the filter capacitors in the PSU. You mean that drive had no airflow
at all? Again, Wow!
>
> As far as flying height, RK05's are the SR71 or U2 of the disk heads.
:-).
RK05s (and similar drives) are good to learn on, because it's difficult
to get a fatal headcrash. I've seen it happen once, or rather I got to
change the heads after it had happened. That head had visible scoring
across the pad. I suppose it might have cleaned up, but I had new heads
in stock anyway...
But most of the time if you stick in a damaged platter or have other
problems, you get the 'ting, ting, ting' noise long before the head is
ruined.
-tony
Received on Wed Aug 11 1999 - 21:21:25 BST