1 Nov
2012
1 Nov
'12
6:10 p.m.
I found a cache of NOS RL01/2 absolute filters (equivalent to DEC p/n 1213097)
at the Filter Factory in Santa Ynez, California (www.thefilterfactory.com),
phone 805.733.2180. They have 47 in stock. Price is $28.60 each, shipping for a
single filter to 60091 (Illinois, USA) was $8.27. I ordered one to verify
dimensions and
construction - perfect match for the original part. The filters were
manufactured by HEPA Corporation (still in business) but minimum order quantity
from HEPA is 100 units. Filter Factory will _not_ be
ordering after the current
stock is gone.
Get'em while you can!
Jack
1 Nov
1 Nov
6:29 p.m.
On 11/01/2012 09:10 PM, Jack Rubin wrote:
I found a cache of NOS RL01/2 absolute filters
(equivalent to DEC p/n 1213097)
at the Filter Factory in Santa Ynez, California (www.thefilterfactory.com),
phone 805.733.2180. They have 47 in stock. Price is $28.60 each, shipping for a
single filter to 60091 (Illinois, USA) was $8.27. I ordered one to verify
dimensions and
construction - perfect match for the original part. The filters were
manufactured by HEPA Corporation (still in business) but minimum order quantity
from HEPA is 100 units. Filter Factory will _not_ be ordering after the current
stock is gone.
Get'em while you can!
So are you saying that HEPA Corporation will make more, but they'll
only do 100 at a time?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
2 Nov
2 Nov
6:16 a.m.
how does one find anything on their website?
On Thu, Nov 1, 2012 at 8:29 PM, Dave McGuire <mcguire at neurotica.com> wrote:
On 11/01/2012 09:10 PM, Jack Rubin wrote:
I found a cache of NOS RL01/2 absolute filters
(equivalent to DEC p/n
1213097)
at the Filter Factory in Santa Ynez, California (
www.thefilterfactory.com),
phone 805.733.2180. They have 47 in stock. Price
is $28.60 each,
shipping for a
single filter to 60091 (Illinois, USA) was $8.27.
I ordered one to verify
dimensions and
construction - perfect match for the original part. The filters were
manufactured by HEPA Corporation (still in business) but minimum order
quantity
from HEPA is 100 units. Filter Factory will _not_
be ordering after the
current
stock is gone.
Get'em while you can!
So are you saying that HEPA Corporation will make more, but they'll
only do 100 at a time?
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
10:58 a.m.
I have two RL02 drives and a single RL01, and am interested in buying at
least a couple of these filters. However, I've never changed the absolute
filters in the drives. Is this something that needs to be done in a very
low particulate environment? Also, unlike the foam prefilters which
deteriorate over time, I'm assuming that the absolute filters (being more
like an A/C filter?) would stay pretty much intact, even though they are
likely quite old NOS?
Thanks for helping a relative newbie :-)
- Earl
3:17 p.m.
On Friday (11/02/2012 at 10:58AM -0700), Earl Evans wrote:
I have two RL02 drives and a single RL01, and am
interested in buying at
least a couple of these filters. However, I've never changed the absolute
filters in the drives. Is this something that needs to be done in a very
low particulate environment? Also, unlike the foam prefilters which
deteriorate over time, I'm assuming that the absolute filters (being more
like an A/C filter?) would stay pretty much intact, even though they are
likely quite old NOS?
In my experience, the pre-filter, which was usually some kind of black
foam... disintegrated into a fine dust and deposited itself all over the
absolute filter-- turning it pitch black like carbon. Of course there
was other dust and junk on the absolute HEPA filter too, but I believe,
in my situation, with two drives, the demise of the pre-filter was the
significant contributor to the demise of the absolute filter.
You don't have to change the absolute filter in a dust free environment
but I wouldn't do it out in the garage or a dusty workshop or during a
sand storm :-)
You need to remove the front panel of the drive and then you will see a
clear plastic "view port" and a lever mechanism that holds that clear
cover over the air channel. You release the lever, remove the cover
(which can be pretty well stuck due to the rubber gasketing) and then
you can gain access to the filter which pulls straight out. It's a
snug fit in the opening and will bind if you don't pull it straight out.
Thanks for helping a relative newbie :-)
Good luck. Section 2.1, starting on page 22 of the PDF here,
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/disc/rl01_rl02/EK-RL12…
discusses the whole procedure.
Chris
--
Chris Elmquist
3 Nov
3 Nov
1:06 p.m.
You don't have to change the absolute filter in a
dust free environment
but I wouldn't do it out in the garage or a dusty workshop or during a
sand storm :-)
When you change the filter, there is nothhing critical that's exposd to
'normal' air that is not also epxosed ewhen you change the disk pack. So
if you are happy changing disk packs in your machine room, then it shoud
lebn OK to change the filter there too.
-tony
7:49 a.m.
On 11/02/2012 01:58 PM, Earl Evans wrote:
I have two RL02 drives and a single RL01, and am
interested in buying at
least a couple of these filters. However, I've never changed the absolute
filters in the drives. Is this something that needs to be done in a very
low particulate environment?
No but make sure the dirt is not left behind so that it can get past the
filter.
RL02 PACKS are not hermetic or even closed to the environment so its not
like a modern HDA and the head flying distances are far greater.
Also, unlike the foam prefilters which
deteriorate over time, I'm assuming that the absolute filters (being more
like an A/C filter?) would stay pretty much intact, even though they are
likely quite old NOS?
The prefilter is to keep chunks out and most anything will do.
Allison
Thanks for helping a relative newbie :-)
- Earl
1:54 p.m.
----- Original Message -----
From: "allison" <ajp166 at verizon.net>
To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
Sent: Saturday, November 03, 2012 2:49 PM
Subject: Re: New absolute filters for DEC RL01/2 drives -
On 11/02/2012 01:58 PM, Earl Evans wrote:
Or if you use a
" better" filter, it may make the absolute last longer. I
use a car air filter as a prefilter on my RK05's ,it has a large surface
area and the air flow seems ok. Not run them long enough to know yet if it
does help though.
Dave
I have two RL02 drives and a single RL01, and am
interested in buying at
least a couple of these filters. However, I've never changed the
absolute
filters in the drives. Is this something that needs to be done in a very
low particulate environment?
No but make sure the dirt is not left behind so that it can get past the
filter.
RL02 PACKS are not hermetic or even closed to the environment so its not
like a modern HDA and the head flying distances are far greater.
Also, unlike the foam prefilters which
deteriorate over time, I'm assuming that the absolute filters (being more
like an A/C filter?) would stay pretty much intact, even though they are
likely quite old NOS?
The prefilter is to keep chunks out and most anything will do.
Allison
Thanks for helping a relative newbie :-)
- Earl
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2221 / Virus Database: 2441/5371 - Release Date: 11/03/12
12:44 p.m.
I have two RL02 drives and a single RL01, and am interested in buying at
least a couple of these filters. However, I've never changed the absolute
filters in the drives. Is this something that needs to be done in a very
low particulate environment? Also, unlike the foam prefilters which
The RL filters last longer than most because, while the system is not
sealed, the 'cooling' air and the 'disk area air' are mostly kept apart.
The air in the disk area is recirculated through the absoulte filter and
over the outside of soem emtal subes, the cooling air flwos down the tubes.
As I said, it's not sealed, which is why the absolute filter is needed in
the first palce. But the design does reduce the amount of dust getting
ino the filter.
deteriorate over time, I'm assuming that the
absolute filters (being more
like an A/C filter?) would stay pretty much intact, even though they are
likely quite old NOS?
Air conditioners are not very common over here, so I don't know what the
filter for one looks like.
The absoulte fitler is a (coated) paper element, much like most car air
filters. In fact some older drives (RK01???) used a car air filter
element, and people have suggested sutting down such an element to fit
the RLs.
I guess after a logn time the plastic housign will go brittle, and manybe
the coting will deterioratem, but they don't turn to goo or powder like
the foam filters.
-tony
1:52 p.m.
As I said, it's not sealed, which is why the
absolute filter is needed in
the first palce. But the design does reduce the amount of dust getting
ino the filter.
Is it something that could be inspected, and changed only if required?
Guess
I'm wondering if the act of inspecting it is going to let in dust,
thus spoiling the whole point of it.
- Earl
4215
days inactive
4216
days old
9 comments
8 participants
participants (8)
-
ajp166＠verizon.net -
ard＠p850ug1.demon.co.uk -
chrise＠pobox.com -
david＠hheng.plus.com -
earl＠retrobits.com -
jack.rubin＠ameritech.net -
mcguire＠neurotica.com -
tdk.knight＠gmail.com