UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > General Vintage Technology Discussions

Notices

General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc.

Closed Thread
 
Thread Tools
Old 25th Dec 2015, 4:32 pm   #41
spamfritter
Pentode
 
spamfritter's Avatar
 
Join Date: Jun 2013
Location: Braintree Essex UK.
Posts: 216
Default Re: Warning fake components

Re fuses that don't fail correctly. If you look at the spec of fuses and MCB's they not only have the marked rating / failure current on them but they are also specified as to how much fault current they can actually break and go open circuit. A lot of older fuses / MCB's are rated to break up to 6000 amps and then go O/C. If the fault level is higher then they can run into problems particularly if the incoming supply fuse to the property is a bit slow. The vapourised metal of the fuse coats the case and thus forming a new conductive path, and, coupled with the gas plasma that exists the arc may re establish and then the bang gets serious. The incoming supply to a house is theoretically capable of delivering a fault current of up to 15,000 amps ! I received a warning from a well known and respected supplier a few years ago regarding a batch of 6 amp type B MCB's which had been supplied to them in good faith. They originated from a dodgy overseas faker and they could catch fire and probably would not operate correctly. So, they are still at it and will continue to as we don't check everything that comes into the country.
spamfritter is offline  
Old 25th Dec 2015, 10:08 pm   #42
Pat Pending
Rest in Peace
 
Join Date: Nov 2015
Location: Kings Lynn, Norfolk, UK.
Posts: 50
Default Re: Warning fake components

My "bread and butter" work, is installing and maintaining industrial power control gear, and I occasionally come across old equipment that need a 2N3055 replaced, (pass transistor or servo output ect.) Under my bench I keep some ancient computer 5v linear PSU's with Motorola devices that act as donors as the "new" ones have recently all been cp. We've also had some X2 caps from a "reputable" supplier that have detonated! (They have light blue moulded cases and been marked "CC capacitor"), all we've had back from the supplier is that we must have installed them incorrectly! Regards. Andy.
Pat Pending is offline  
Old 5th Jan 2016, 10:32 pm   #43
TonyDuell
Dekatron
 
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,133
Default Re: Warning fake components

Incindentally, I am pretty sure a high street shop not too far from me is selling fake fuses. Branded Bussmann (who are a well respected manufacturer), but I am sure they are not. They do not have the sand filling for one thing.

I would report said issue to the appropriate people if only I could find out how to do it!
TonyDuell is online now  
Old 5th Jan 2016, 10:41 pm   #44
dseymo1
Retired Dormant Member
 
Join Date: Dec 2007
Location: Shropshire, UK.
Posts: 3,051
Default Re: Warning fake components

I'm sure Trading Standards would be willing to look into it.
I believe they have specialist technical departments if it needs anything more than just checking with Bussman.
dseymo1 is offline  
Old 6th Jan 2016, 8:50 am   #45
stevehertz
Dekatron
 
stevehertz's Avatar
 
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,788
Default Re: Warning fake components

Quote:
Originally Posted by TonyDuell View Post
Incindentally, I am pretty sure a high street shop not too far from me is selling fake fuses. Branded Bussmann (who are a well respected manufacturer), but I am sure they are not. They do not have the sand filling for one thing.
The fake Bussman fuses is well known and has been going on for donkey's years.
__________________
A digital radio is the latest thing, but a vintage wireless is forever..
stevehertz is online now  
Old 6th Jan 2016, 8:48 pm   #46
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,868
Default Re: Warning fake components

Quote:
Originally Posted by dseymo1 View Post
I'm sure Trading Standards would be willing to look into it.
I believe they have specialist technical departments if it needs anything more than just checking with Bussman.
Unless you've been personally injured, I really doubt Trading Standards could be bothered. Local authorities don't waste money on speculative investigations these days.

[If you've suffered a personal loss/injury a 'no win no fee' legal firm is the best approach]
G6Tanuki is offline  
Old 6th Jan 2016, 10:29 pm   #47
Guest
Guest
 
Posts: n/a
Default Re: Warning fake components

Re trading standards, I got a radio (2m/70cm handheld transceiver) with a lithium charger that merrily fed 5V to the cell depending on the safety circuit of the cell to stop the charging. Very naughty in its self, along with that the charger came with an adaptor for 13A sockets (one of those you can plug anything in here types that are leathal) despite that all UK supplied mains stuff has to have a 13A plug on it.

I got an appointment with the local trading standards department and pointed out the failings, who, after a while, said "we have no reason to take action". What's the point of rules and regulations?
 
Old 7th Jan 2016, 4:56 pm   #48
PJL
Dekatron
 
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
Default Re: Warning fake components

I pointed out to a global PC supplier that the powered speakers they supplied had a 13A fuse in the plug and the cable was only fit for about 3A. No response to that either.
PJL is offline  
Old 7th Jan 2016, 5:00 pm   #49
ms660
Dekatron
 
ms660's Avatar
 
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Warning fake components

Not to mention the battery within battery trick.

Lawrence.
ms660 is offline  
Old 7th Jan 2016, 5:33 pm   #50
Refugee
Dekatron
 
Refugee's Avatar
 
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,546
Default Re: Warning fake components

There are those items that are either unobtainium or unsafe. There is a workaround.
Those slightly oversize promotional tobacco tins that some 50g packs came in are just the right size to act as a fire safety container for charging those dodge E-cig batteries. The best ones don't have hinges on the lid so that you can stand the tin in the lid to give the deck top double steel protection.
Always use a 500ma limited USB charger and not a non approved wall wart.
Refugee is online now  
Old 7th Jan 2016, 10:37 pm   #51
Valve'n'vinyl
Pentode
 
Join Date: Sep 2006
Location: Scarborough , North Riding of Yorkshire
Posts: 202
Default Re: Warning fake components

As regards to 'Fake' fuses I tend to get genuine 1960's MK / ever ready fuses out of vintage scrap equipment . Sounds penny pinching but I was scared to death when I watched a Panorama programme about distribution boards that were marked with MK and were knock offs from China IDENTICAL in every way . The programme showed plugs and boards literally exploding and not behaving as expected . I would rather trust a fuse that has been in an old appliance than anything new . I have an adequate stash of these now and I gave a dozen MK's to a friend who works at university to test to destruction VS new MK fuses as a project a couple of years back , the tests came back well within spec and the modern ones seemed to be chopping out at 15-16amp one at 22 amp ...Not good ! So , I put my faith in the oldies .
Valve'n'vinyl is offline  
Old 8th Jan 2016, 12:01 am   #52
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,830
Default Re: Warning fake components

You can't always blame the consumer. We had an insurance claim for lightning damage to a Microsoft X-box 'house brick' power unit. Gone bang, so a new one was required. All around £15, many trumpeting every CE and BS mark you could think of - and all fake. I refused to supply one of these and eventually sourced one (with difficulty) from Germany. Identical in all respects except price - over £60 - but I can sleep at night. So can the customer - it appears that the fake's fan sounds like a tractor!
Welsh Anorak is offline  
Old 14th Jan 2016, 1:37 am   #53
Andrew B
Heptode
 
Andrew B's Avatar
 
Join Date: May 2015
Location: Bradford, West Yorkshire, UK.
Posts: 509
Default Re: Warning fake components

Hi all

I found this while "creeping around the net", as you do.

Quote:
The old warning about taking wooden nickels has returned in electronic guise: beware of counterfeit radio tubes! Every trade has its own kind of crooks. Electronics' contribution to the criminal roster is the fly-by-night dealer who buys up old, defective tubes for next to nothing, forges a new brand on them, and sells them at "bargain prices."
http://www.rfcafe.com/references/pop...lectronics.htm

Enjoy the read.

73

Andrew
__________________
worried about the electrons entering the circuit and the smoke leaving

Andrew
Andrew B is offline  
Old 4th Dec 2016, 9:29 pm   #54
jimmc101
Heptode
 
jimmc101's Avatar
 
Join Date: Mar 2009
Location: Portsmouth, Hampshire, UK.
Posts: 674
Default Re: R.F. voltmeter: your thoughts, please

Anyone taken a punt on the AD8307s from China at 5 for £1.30 for the SO8 package?
A complete module is available for £12 but does require some work to be usable, see http://owenduffy.net/blog/?p=7559

Jim
jimmc101 is offline  
Old 4th Dec 2016, 11:41 pm   #55
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,654
Default Re: R.F. voltmeter: your thoughts, please

I'd be very wary. I subscribe to the view that if something seems to be too good to be true, it probably is.

There was a typo in my last postAD8307 is what I meant, my fault, sorry.

I got burned with fake AD parts (AD811 video amps) in a former job. They'd been procured by a major global sub-contract board assemble.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Old 4th Dec 2016, 11:47 pm   #56
Bazz4CQJ
Dekatron
 
Bazz4CQJ's Avatar
 
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,902
Default Re: R.F. voltmeter: your thoughts, please

Well this is embarrassing.. I am currently waiting for a pack of 10 AD8307 from China for which I paid something like £2.30 with free P&P

B
Bazz4CQJ is offline  
Old 5th Dec 2016, 2:03 am   #57
Terry_VK5TM
Nonode
 
Terry_VK5TM's Avatar
 
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,303
Default Re: R.F. voltmeter: your thoughts, please

I have bought AD8307's out of China and they were all OK.

The circuit in the original post is from 73 magazine, December 1973 page 53 - Sensitive RF Voltmeter.

Available on the 'net if you google it.

Terry
Terry_VK5TM is offline  
Old 5th Dec 2016, 2:05 am   #58
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,507
Default Re: R.F. voltmeter: your thoughts, please

£2-30 isn't that embarrassing

I wonder what they'll be?
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is offline  
Old 5th Dec 2016, 7:57 am   #59
MrBungle
Dekatron
 
MrBungle's Avatar
 
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
Default Re: R.F. voltmeter: your thoughts, please

Might be lucky. It's a 50/50 on that sort of thing. The least likely to be genuine thing so far I found was MOSFETs. Ids of 20A? More like 500mA.
MrBungle is offline  
Old 5th Dec 2016, 9:04 am   #60
Craig Sawyers
Dekatron
 
Craig Sawyers's Avatar
 
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,918
Default Re: R.F. voltmeter: your thoughts, please

I've been burned too many times with fake Chinese silicon - either from China, or from UK based outlets who import Chinese fakes.

Worst ones (obsolete) were:

2SC3675, a high voltage NPN (Vceo 900V). The rubbish I bought broke down at 500V and annihilated every other bit of silicon in the design.

2SJ74/2SK170 low-noise JFETs. The supplied transistors had completely the wrong Idss and Vp, so could not possibly be the real deal.

After those I swore I would never again buy from China via auction sites or from one particular UK supplier.

As MrBungle said - it is a real lottery buying silicon from oriental sources.

Craig
Craig Sawyers is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 7:28 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.