Author Topic: What did you buy today? Post your latest purchase!  (Read 1550749 times)

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Offline technix

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Re: What did you buy today? Post your latest purchase!
« Reply #9975 on: April 18, 2020, 05:50:17 am »
TPLink is not just SOHO. It does have SMB grade gears. It doesn't tap into the real big gun business though.
TP-Link gracefully yielded to Huawei when coming to big gun stuff, and to Lenovo at computing equipment.

I went for 2x 4TB WD Blue. The "bang for buck" or price per kB seems to be best at 4TB at the moment and I also have no idea how I could need more than 8TB.
4TB WD Blue are ex-Greens. (WD scratched the Greens after that brand tanked, and rebranded them into the Blues. 1TB and smaller Blues are what they was - blues through and through, 3TB and above are ex-Greens, and at 2TB you have both genuine Blues and ex-Greens)

I'd suggest avoid those ex-Greens, well, for they are Greens after all. The Reds are just much more stabler.
 

Offline Kilrah

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Re: What did you buy today? Post your latest purchase!
« Reply #9976 on: April 18, 2020, 06:30:54 am »
I'd suggest avoid those ex-Greens, well, for they are Greens after all. The Reds are just much more stabler.
Well if you ignore the recently discovered mess of Reds undisclosedly using SMR and being buggy/often failing when resilvering arrays. Kinda stupid when they're sold as specifically made for use in arrays.

Meanwhile I have a bunch of Greens still running strong... but all my main HDD storage is on Seagates at the moment for capacity reasons.
« Last Edit: April 18, 2020, 06:34:17 am by Kilrah »
 

Offline technix

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Re: What did you buy today? Post your latest purchase!
« Reply #9977 on: April 18, 2020, 03:45:20 pm »
Well if you ignore the recently discovered mess of Reds undisclosedly using SMR and being buggy/often failing when resilvering arrays. Kinda stupid when they're sold as specifically made for use in arrays.
I don't use any drive that can not rebuild itself within six hours. Since modern hard drives can do about 1TB continuous write per hour, that means 6TB maximum per drive. This is well before SMR would come in play. My current storage arrays are constructed using 8x 2TB drives and 6x 3TB drives, in a mixed RAID-60 setup across two MegaRAID 9271-8iCC hardware RAID cards.
 

Offline 6h8c

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Re: What did you buy today? Post your latest purchase!
« Reply #9978 on: April 18, 2020, 06:44:31 pm »
The collection is growing    |O   
just where to put it ?
Don't tell my wife how much this fun costs ... I want to live to build.
 

Offline Kilrah

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Re: What did you buy today? Post your latest purchase!
« Reply #9979 on: April 18, 2020, 07:47:59 pm »
I don't use any drive that can not rebuild itself within six hours. Since modern hard drives can do about 1TB continuous write per hour, that means 6TB maximum per drive. This is well before SMR would come in play
No that's the whole point, SMR used to be for large capacities and clearly marketed "for archival", but somehow they decided standard desktop and RAID-spec drives all the way down to 2TB that were previously conventional would now silently become SMRs, under the same branding and at the same price with no notice or any mention/change in advertised specs. They're at best 2x slower on writes than conventional, and cause some arrays to fail to rebuild on them, it runs for a while and aborts because once the CMR cache is full they essentially lock up for extended periods while they rearrange their stuff internally and the systems time out and cancel the rebuild (plus more issues depending on access patterns).

Saving pennies by removing a platter / pair of heads or 2... and when confronted try to hide/lie behind "we don't mention it becasue these are technical details consumers don't need to know" kind of stuff.
https://blocksandfiles.com/2020/04/14/wd-red-nas-drives-shingled-magnetic-recording/
https://blocksandfiles.com/2020/04/15/shingled-drives-have-non-shingled-zones-for-caching-writes/

Quote
I _was_ able to force the WD40EFAX to resilver – by switching off write caching and lookahead. This dropped the drive’s write speed to less than 6MB/sec and the resilvering took 8 days instead of the more usual 24 hours. More worryingly, once added, a ZFS SCRUB (RAID integrity check) has yet to successfully complete without that drive producing checksum errors, even after 5 days of trying.

I could afford to try that test because RAIDZ3 gives me 3 parity stripes, but it’s clear the drive is going to have to come out and the 3 WD Reds returned as unfit for the purpose for which they are marketed.

It's a total shitshow.

Seems the other drive manufacturers are doing the same lately but at least haven't denied it like WD did.
« Last Edit: April 18, 2020, 09:05:51 pm by Kilrah »
 
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Online rdl

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Re: What did you buy today? Post your latest purchase!
« Reply #9980 on: April 18, 2020, 08:10:18 pm »

https://arstechnica.com/gadgets/2020/04/caveat-emptor-smr-disks-are-being-submarined-into-unexpected-channels/

Unbelievable almost that companies can be so stupid. Did they really think no one would notice?
 
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Offline Kilrah

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Re: What did you buy today? Post your latest purchase!
« Reply #9981 on: April 18, 2020, 08:13:01 pm »
Yes it's absolutely ridiculous. Seems some management bonehead had a bright idea to save almost nothing and somehow got greenlighted on the gamble... it deserves to blow back HARD.
 

Offline duckduck

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Re: What did you buy today? Post your latest purchase!
« Reply #9982 on: April 18, 2020, 09:43:02 pm »
Pretty. Look at those caps "Made in the USA". Ha! That hasn't been printed on anything in ages. All that glass and point to point / tagboard wiring reminds me of a guitar amp. It has both input and output. One setting on the voltage range is 1MV.  :wtf: What is that thing? Nice Pics. Thanks for sharing.
 

Offline beanflying

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Re: What did you buy today? Post your latest purchase!
« Reply #9983 on: April 19, 2020, 05:07:35 am »
Another $400 AU pesos worth of Nuts, Bolts, Rails and Drive gear for my Laser Build - Broke Bean Again. Time to start saving for the expensive bits now while the $ hopefully recovers a bit :palm:
« Last Edit: April 19, 2020, 05:16:10 am by beanflying »
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 

Offline technix

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Re: What did you buy today? Post your latest purchase!
« Reply #9984 on: April 19, 2020, 05:35:08 am »
No that's the whole point, SMR used to be for large capacities and clearly marketed "for archival", but somehow they decided standard desktop and RAID-spec drives all the way down to 2TB that were previously conventional would now silently become SMRs, under the same branding and at the same price with no notice or any mention/change in advertised specs. They're at best 2x slower on writes than conventional, and cause some arrays to fail to rebuild on them, it runs for a while and aborts because once the CMR cache is full they essentially lock up for extended periods while they rearrange their stuff internally and the systems time out and cancel the rebuild (plus more issues depending on access patterns).
Unbelievable almost that companies can be so stupid. Did they really think no one would notice?
Currently all my Reds are the older WDxxEFRX variant that uses CMR. I'm noting this so I can specifically ask for WD20EFRX and WD30EFRX as my 2TB and 3TB replacement units.
 

Online mansaxel

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Re: What did you buy today? Post your latest purchase!
« Reply #9985 on: April 19, 2020, 01:09:26 pm »
One setting on the voltage range is 1MV.  :wtf: What is that thing?

In the olden days some US vendors did not fully appreciate that SI units are case significant. milli and Mega must of course be discerned by case. hp was also responsible for such misses on some devices. 

As to what it is, it is a valve voltmeter or "vacuum tube volt meter", VTVM for short. The classic model everyone else tried to copy is the hp 410b which is much more competent than this Eico. Not that the Eico is bad; the 410b is simply exceptional, with AC measurement up to 700MHz, with DC and resistance ranges to boot. 

Why was there such a focus on them being valve voltmeters? Well, for starters, the only electronic amplifier available was the valve. Very early VTVMs started appearing in the 30s, and were perfected in the early 50s. And, with the alternative being electromechanical meters like the Avometer or the Simpson, where, even in those quality instruments, there is a low resistance in the meter (affecting the DUT and the reading) and bad AC frequency response (most likely not above 20KHz, and even that was a stretch) it obviously was important to point out things like a DCV resistance in the range of 10MΩ and AC response up into UHF.

I've wanted one since I read the service instructions for 60s HiFi gear stating "you need a VTVM to get this right, don't try it with a purely mechanical instrument". As a consequence, a lot of gear was shipped with service manuals that said "if you're using an Avometer 8, this is the value you should be seeing at test point 46"

You can get a cheap one like the Heathkit VTVM for perhaps $50, with lots of variation in price.  I've got an ex MoD Marconi. Temperamental, but works.

Offline vk6zgo

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Re: What did you buy today? Post your latest purchase!
« Reply #9986 on: April 19, 2020, 11:50:17 pm »
One setting on the voltage range is 1MV.  :wtf: What is that thing?

In the olden days some US vendors did not fully appreciate that SI units are case significant. milli and Mega must of course be discerned by case. hp was also responsible for such misses on some devices. 

As to what it is, it is a valve voltmeter or "vacuum tube volt meter", VTVM for short. The classic model everyone else tried to copy is the hp 410b which is much more competent than this Eico. Not that the Eico is bad; the 410b is simply exceptional, with AC measurement up to 700MHz, with DC and resistance ranges to boot. 

Why was there such a focus on them being valve voltmeters? Well, for starters, the only electronic amplifier available was the valve. Very early VTVMs started appearing in the 30s, and were perfected in the early 50s. And, with the alternative being electromechanical meters like the Avometer or the Simpson, where, even in those quality instruments, there is a low resistance in the meter (affecting the DUT and the reading) and bad AC frequency response (most likely not above 20KHz, and even that was a stretch) it obviously was important to point out things like a DCV resistance in the range of 10MΩ and AC response up into UHF.

I've wanted one since I read the service instructions for 60s HiFi gear stating "you need a VTVM to get this right, don't try it with a purely mechanical instrument". As a consequence, a lot of gear was shipped with service manuals that said "if you're using an Avometer 8, this is the value you should be seeing at test point 46" e

You can get a cheap one like the Heathkit VTVM for perhaps $50, with lots of variation in price.  I've got an ex MoD Marconi. Temperamental, but works.

HP410C is my favourite!
We used them, back in the day, along with the hp coaxial sampler to measure power on lower power TV transmitters, using V^2/R.

The good thing was that the probe was a "sample & hold" type, so we could read the RMS value of the "sync tip" voltage, & directly calculate "sync tip power", as that was what the specification for vision/aural power was specified w.r. t.

I picked one up a couple of years ago at a Hamfest--- the "ac zero" pot was jammed, but a bit of "working " of it back & forth cleared the problem.

As is common with old ones like this, the centre spike from the DC probe is missing, but everything else works well, now.

As to using an AVO 8, both Tektronix & Marconi often built in voltage dividers to a test point, so that critical voltages could be checked with an AVO, Simpson, or similar VOMs.

A.T.E. tube type VHF point to point Radio links provided special test points so that grid & anode currents could be read with an AVO 8.

All good, except if you are trying to "peak the grid & dip the plate" at a minesite, where the primary function of the power station was to power an enormous machine which, every time it dug into the ore face caused the Mains to dip alarmingly.
You would be just approaching an anode dip, when the lights would suddenly dip, & the AVO would go crazy!

We had Stabilacs, but the voltage drop was too severe & too fast for them to handle.
 

Offline ChristofferB

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Re: What did you buy today? Post your latest purchase!
« Reply #9987 on: April 20, 2020, 12:39:58 pm »
"It doesn't clearly detect the Potassium in a banana"

Get a bottle of 100% "no salt" substitute for people on a low salt diet at the grocery store. The potassium 40 in that lights up my NaI detector very well with the 1.46MeV gamma.
I tried the "lite salt" stuff, presumably 50% NaCl and 50% KCl and was not able to detect a clear change in count rate.
I didn't put it on a counter and take a couple minute count.  I might try that after I get the thing into a more packaged form.

Jon


I've been collecting gear for almost this exact setup for a while!

I was able to manually do gamma spectroscopy with a single-channel analyzer and a lot of spare time.

I recently got both Ortec counters, their RS232/GPIB interface, the single-channel analyzer, a 7-decade scaler and a Canberra delay amplifier for way too much, but I'm having too much fun to care!

The attached spectrum is from around 100g potassium carbonate. I also did a video on it, but my setup has evolved quite a bit since.

You really should be able to see a count rate difference, even with a normal geiger counter for a decent potassium source, though!
--Christoffer
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Offline richnormand

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Re: What did you buy today? Post your latest purchase!
« Reply #9988 on: April 20, 2020, 09:37:03 pm »

@ChristofferB
see reply #9974 on: April 17, 2020, 10:44:19 pm in this thread for the expected Geiger counter signal and a NaI detector MCA response.
Your SCA curve is pretty much on the nose :) Have you considered writing a program to automate the process since you mentionned having RS232 and GPIB available?

REPAIR, RENEW, REUSE, RECYCLE, REDUCE, REPURPOSE....
 

Offline djos

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Re: What did you buy today? Post your latest purchase!
« Reply #9989 on: April 20, 2020, 10:37:02 pm »
A DS218+ plus some WD Harddrives to put into it. Up to now I have been sharing files via Win10 from an external USB drive, but due to unreliability and the fact that it stops working every time Win10 updates anything I've finally decided to get a NAS.

McBryce.

Nice, I've got the older DS213J with a pair of 6TB WD reds in JBOD - it runs my IP Camera System via Synologies Surveillance Station and serves as an iSCSI Target for my HP N36L Microserver (Windows Server 2012 R2 Backup's).
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Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #9990 on: April 21, 2020, 07:28:57 am »
A DS218+ plus some WD Harddrives to put into it. Up to now I have been sharing files via Win10 from an external USB drive, but due to unreliability and the fact that it stops working every time Win10 updates anything I've finally decided to get a NAS.

McBryce.

Nice, I've got the older DS213J with a pair of 6TB WD reds in JBOD - it runs my IP Camera System via Synologies Surveillance Station and serves as an iSCSI Target for my HP N36L Microserver (Windows Server 2012 R2 Backup's).

After a few days of playing about with it, I'm happy with the Hardware, but the software could be a lot better. Can anyone tell me if there's a simple way of refreshing the index for the music ctation, without having to go 7 levels into the admin settings??

McBryce.
 

Offline djos

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Re: What did you buy today? Post your latest purchase!
« Reply #9991 on: April 21, 2020, 07:36:33 am »
I'd suggest using Plex as the media/music Server on your Synology - it's a much better solution.
The impossible often has a kind of integrity which the merely improbable lacks.

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Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #9992 on: April 21, 2020, 07:44:03 am »
I did consider that, but someone told me it needs clients at the other end and my TV (Panasonic) doesn't have Plex or any way of installing it.

Edit: Just checked it out. It would work on one of the TV's but Plex involves setting up accounts etc, all I want is to stream around the house.

McBryce.
« Last Edit: April 21, 2020, 07:52:31 am by McBryce »
 

Offline djos

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Re: What did you buy today? Post your latest purchase!
« Reply #9993 on: April 21, 2020, 07:51:50 am »
I did consider that, but someone told me it needs clients at the other end and my TV (Panasonic) doesn't have Plex or any way of installing it.

McBryce.

It has a web client plus DNLA server built-in too.

I have a Panasonic TV too and the Plex client is so old I use an Xbox One S as my main media player.
The impossible often has a kind of integrity which the merely improbable lacks.

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Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #9994 on: April 21, 2020, 07:54:17 am »
Yeah, just read up on it. It looks good, but I don't want something that involves setting up yet another online account, when all I want is a piece of software that works within my home.

McBryce.
 

Offline djos

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Re: What did you buy today? Post your latest purchase!
« Reply #9995 on: April 21, 2020, 07:59:38 am »
Fair enough.
The impossible often has a kind of integrity which the merely improbable lacks.

Visit my Tindie store for Tandy 1000 Adapters for EX, HX, SX, SL, TX & TL etc
 

Offline McBryce

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Re: What did you buy today? Post your latest purchase!
« Reply #9996 on: April 21, 2020, 08:27:50 am »
Just read up some more. suposedly there is a way of using Plex without an account. I'll give it a go... Just installed it on the DS218+ and will try it out once it has indexed the database (so probably tomorrow).

McBryce.
 

Offline djos

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Re: What did you buy today? Post your latest purchase!
« Reply #9997 on: April 21, 2020, 08:39:09 am »
Just read up some more. suposedly there is a way of using Plex without an account. I'll give it a go... Just installed it on the DS218+ and will try it out once it has indexed the database (so probably tomorrow).

McBryce.

I have a lifetime subscription so that has never been an issue for me - for us it's well worth it, just makes media playback and management so easy. My favorite feature, and why I dropped Kodi for it (some years ago), is the media playback tracking - I can start watching something in my study and then resume watching it in my lounge or on my iPad. 
« Last Edit: April 21, 2020, 09:18:06 pm by djos »
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Offline Black Phoenix

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Re: What did you buy today? Post your latest purchase!
« Reply #9998 on: April 21, 2020, 02:28:59 pm »
Well big haul today:
 - Rotring Triangular Ruler S0220721 1:500;
 - 1 bag of Merries S and 2 bags of Merries M diapers (the kid sh#ts a lot!!! :-DD);
 - 2.5m by 4m grey photography backdrop (I do photography as a hobby and there was a chance of making some money with portraits, so why not try?);
 - Pentel Graphgear 1000 Mechanical Pencil .7 (to make the pair with the Ballpoint .7 that I already own since 2013 - discontinued);
 - TFZ T2 Galaxy IEM plus TFZ My Love IEM for my SO (Good V-Shape IEMs that rival brands as Shure/Shennheiser/AKG/Westone plus the TFZ My Love were just more 99RMB to the total price because of a promotion they have. I also got free a hoodie from the brand. That way my K845BT can stay at home);
 - Earpads for my old Sennheiser Momentum On-Ear that I gave to my wife (the rubber that fits them cracked and the original ones are kaput. They grey from the new ones is a lighter one compared with the original ones, but the sound signature is the same as the official ones that Sennheiser don't sell anymore)
 - Leatherette headband for my AKG K845BT (disintegrated as the original pads with the use. Pads already exchanged for the Brainwavz Hybrid);
 - Kokuyo Urban Monochrome B5 Binder (needed an extra one other than the Campus I already own).
« Last Edit: April 21, 2020, 03:04:55 pm by Black Phoenix »
 

Online nctnico

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Re: What did you buy today? Post your latest purchase!
« Reply #9999 on: April 21, 2020, 02:51:18 pm »
I bought a holder for a mobile phone on my bycicle. I intend/hope to use it for navigation. I'm in need to try new routes.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 


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