it's a good point - I just looked and it's not that different from water. But, I've seen fuel systems that ran on pure methanol corroded pretty quickly if they weren't cleaned out after a run. I guess the corrosion is enhanced in methanol by effects on the surface layer of metals like aluminum and magnesium, that depend on a surface layer to halt corrosion.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
-----Original Message----- From: Hans Vlems
Sent: Saturday, May 17, 2014 3:31 PM
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] TK50 issues
Lee, have you looked up the pKa for methanol?
Verzonden vanaf mijn BlackBerry 10-smartphone.
Origineel bericht
Van: Lee Gleason
Verzonden: zaterdag 17 mei 2014 22:17
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] TK50 issues
Methanol would do as well but is more poisonous.
Careful with methanol - it's a more potent solvent in general than ethanol
or isopropanol. Lots of rubber and plastic compounds are attacked by
methanol.
Additionally, the H in the OH group isn't held onto as tightly as in the
other organic OH compounds, so methanol is corrosive to metal.
It's also a middlin' good oxidizer for some metals.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
Lee, have you looked up the pKa for methanol?
Verzonden vanaf mijn BlackBerry 10-smartphone.
Origineel bericht
Van: Lee Gleason
Verzonden: zaterdag 17 mei 2014 22:17
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] TK50 issues
Methanol would do as well but is more poisonous.
Careful with methanol - it's a more potent solvent in general than ethanol
or isopropanol. Lots of rubber and plastic compounds are attacked by
methanol.
Additionally, the H in the OH group isn't held onto as tightly as in the
other organic OH compounds, so methanol is corrosive to metal.
It's also a middlin' good oxidizer for some metals.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
Methanol would do as well but is more poisonous.
Careful with methanol - it's a more potent solvent in general than ethanol or isopropanol. Lots of rubber and plastic compounds are attacked by methanol.
Additionally, the H in the OH group isn't held onto as tightly as in the other organic OH compounds, so methanol is corrosive to metal.
It's also a middlin' good oxidizer for some metals.
--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net
On 4 May 2014, at 03:41, Mark Abene <phiber at phiber.com> wrote:
I was emulating a full cisco 7206VXR in dynamips/dynagen on my linux/ARM
Okay, I want to get this up and going but I have ZERO experience on Cisco, IOS or anything that emulates it. Google results are a bit confusing, so some pointers would be greatly appreciated!
--
Mark Benson
http://DECtec.info
Twitter: @DECtecInfo
HECnet: STAR69::MARK
Online Resource & Mailing List for DEC Enthusiasts.
On 2014-05-17 20:19, Brian Schenkenberger, VAXman- wrote:
Johnny Billquist <bqt at softjar.se> writes:
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the
TK50. :-)
Hopefully, your Exabyte isn't the 8200. ;)
I never remember if it is an 8200 or an 8500. Either way, it's been working fine for the last 20 years or so... :-)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
On 05/17/2014 02:19 PM, Brian Schenkenberger, VAXman- wrote:
Hopefully, your Exabyte isn't the 8200. ;)
Wha. WHAT. No. NO. NOOOOOOO!!!
YYAAAAAAAAAAAAA!! *BLAM!* (<-- head explodes)
--
Dave McGuire, AK4HZ
New Kensington, PA
Johnny Billquist <bqt at softjar.se> writes:
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the
TK50. :-)
Hopefully, your Exabyte isn't the 8200. ;)
--
VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)ORG
I speak to machines with the voice of humanity.
On 2014-05-17 20:14, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives
that occasionally decided to not give the cartridge back, and I have
had to extract them and manually rewind the tape in (boring as hell),
but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is
confusing. The TK70 is better... And TK50 exists in different firmware
revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E
install media on that.
I have Exabyte, DDS-3 and TK50 on my PDP-11 at home. I never use the TK50. :-)
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
On Sat, 17 May 2014, Johnny Billquist wrote:
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives that occasionally decided to not give the cartridge back, and I have had to extract them and manually rewind the tape in (boring as hell), but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is confusing. The TK70 is better... And TK50 exists in different firmware revisions, and some are quirkier than others.
Agreed with the operation being confusing. ;)
I think I'm going to end up just cleaning a DAT drive and shoving RSTS/E install media on that.
Johnny
--
Cory Smelosky
http://gewt.net Personal stuff
http://gimme-sympathy.org Projects
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
On 2014-05-17 19:33, Cory Smelosky wrote:
On Sat, 17 May 2014, Johnny Billquist wrote:
Others have replied, but anyway.
Yes, you need to clean the TK50. Almost certain that is your problem.
And cleaning them is easy. Open the box, so that you can see the
drive. There is a cover plate over the drive, fastened by four screws.
Remove the cover plate and you'll see the head, the rollers, and the
pickup hub.
Use iso-propanol and a swab, and just clean the head.
Reassemble, and you're done.
Johnny
I got the one perfectly cleaned...but the motor appears to be failing at
times and putting a cartridge in seals its fate. If I start using it
beyond the first foot or so I'd be fine...so long as I never want to
REMOVE the cartridge.
A bit odd. I don't remember ever having that problem. I've had drives that occasionally decided to not give the cartridge back, and I have had to extract them and manually rewind the tape in (boring as hell), but after some mucking around I've normally gotten them working again.
But the TK50 is not the best design around, and the operation is confusing. The TK70 is better... And TK50 exists in different firmware revisions, and some are quirkier than others.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
--
DECtec mailing list
http://dectec.info
To unsubscribe from this list see page at: http://dectec.info/mailman/listinfo/dectec_dectec.info
