HT Relay
 

In article , David Looser
wrote:

Had you thought about simply hard-wiring the two units together? then
the problem vanishes. Or if you *must* use a plug & socket make it
impossible to remove it without unplugging the mains first. I really do
think that you are likely to end up with an electrical interlock system
that is so complex, and based on potentially unreliable components, as
to fail to provide the safety that is supposedly your aim.

I also worry about that. The more complex the system is - particularly when
physical items like relays and plugs/sockets are involved - the more
failure modes and sources of failure there will be.

TBH it still seems safer as well as simpler (and cheaper) to me to just fit
appropriate forms of connectors and use a protection diode and bleeds to
the destination. Safer because the number of items present has been
reduced, and no mechanical sensing is involved.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

HT Relay
 

"Phil Allison" wrote in message
...

"David Looser has Roos loose in his top paddock "


BTW why do you think PCB relays won't have enough voltage rating?

** The laws of physics ??


I've just found a relay with a 10kV rating for the contact,
and that is a PCB mounting type.


** One of these - right ?

http://www.farnell.com/datasheets/56123.pdf

As it happens no, but that one will do.

It's a reed relay, so switching is done in a vacuum.

Yes, and? Did I say otherwise?

The 50 watt max rating means it will switch 5mA at 10kV.

Or 140mA at 350 VDC .............

Yes, and?

Same as many other types mentioned already.


It's a high voltage relay that is PC mounted, which is what I said. Whether
it is a reed-relay or not, or what its current rating is is irrelevant to
the point.

Wot a pathetic bull**** artist you are.


Sorry Phil, the "bull**** artist" around here is you, always has been.


David.

David Loser has Roos loose in his top paddock
 

"David Loser has Roos loose in his top paddock "


BTW why do you think PCB relays won't have enough voltage rating?

** The laws of physics ??


I've just found a relay with a 10kV rating for the contact,
and that is a PCB mounting type.


** One of these - right ?

http://www.farnell.com/datasheets/56123.pdf

It's a reed relay, so switching is done in a vacuum.

The 50 watt max rating means it will switch 5mA at 10kV.

Or 140mA at 350 VDC .............

Same as many other types mentioned already.

Wot a pathetic ****img bull**** artist you are.

FOAD.



...... Phil

Phil Allison has lost the argument
 

"Phil Allison" wrote

It's a reed relay, so switching is done in a vacuum.

The 50 watt max rating means it will switch 5mA at 10kV.

Or 140mA at 350 VDC .............

Same as many other types mentioned already.


Why re-post stuff which I have already explained is irrelevant?

Because you simply cannot bear to lose an argument, even when you are
talking complete ********.

Goodbye Phil..

David.

HT Relay
 

"Jim Lesurf" wrote in

During the first years of manufacture the ampliers/recievers in the
Armstrong 600 range used a thermal delay relay to avoid a surge when the
unit was switched on.


I remember it well as I had a 600 with one in. To me it appeared to be a
cheap & nasty little thing that failed very early on. I simply shorted it
out and the receiver continued to work for many years without it.

These were expensive.

Maybe, but it was still cheap & nasty.

And they were one of the main failure modes which
brought sets back for repair. One of the reasons I avoid physical relays.

But a thermal relay is a totally different animal from a conventional
electromagnetic relay. They have very slow make & break of the contacts, and
the characteristics of the bi-metal strip changes with age. Having said that
I've known *much* better and more reliable thermal relays than the one you
used.

I replaced them in later sets with a better PSU that simply didn't need a
mechanical relay.

Your original PSU didn't need it either IME. :-)

David.

David Loser is a DAMN LIAR
 

"David Loser is a DAMN LIAR "


Why re-post stuff which I have already explained is irrelevant?


** Because you " explained " no such ****ing thing.

You are nothing but a context manipulating pile of autistic garbage.

BTW:

Autism is 100% genetic.

So your parents and any children have it too.

A pox on the lot of them.




..... Phil

HT Relay
 

"Jim Lesurf"


During the first years of manufacture the ampliers/recievers in the
Armstrong 600 range used a thermal delay relay to avoid a surge when the
unit was switched on.

These were expensive. And they were one of the main failure modes which
brought sets back for repair. One of the reasons I avoid physical relays.
I
replaced them in later sets with a better PSU that simply didn't need a
mechanical relay. Over the following few years it was quite clear that
this
had a big impact on the reliability of the sets.


** So the pig ignorant pommy ****wit was so stupid he used one of these ?

http://www.tpub.com/content/neets/14...4175_153_1.jpg

The kind on the left - I bet.

ROTFLMAO !!!!!!!!!!

Wot a ****ing MORON !!!



....... Phil

HT Relay
 

In article , David Looser
wrote:
"Jim Lesurf" wrote in

During the first years of manufacture the ampliers/recievers in the
Armstrong 600 range used a thermal delay relay to avoid a surge when
the unit was switched on.


I remember it well as I had a 600 with one in. To me it appeared to be a
cheap & nasty little thing that failed very early on. I simply shorted
it out and the receiver continued to work for many years without it.

In that case you were fortunate to get away with not realising what other
changes needed to be made! Sometimes the Ghods forgive those who make
changes in ignorance of the likely consequences. The main point of the
delay relay was that the bridge diodes that had been used had too low a
surge current rating. So bypassing the relay without also changing to new
diodes was increasing the chance of PSU failure.

These were expensive.

Maybe, but it was still cheap & nasty.

Odd that you haven't noticed that 'expensive' and 'cheap' clash here. :-)

However I tested a number of them over a period of time, and compared them
with alternatives. I note your opinion based - presumably - on appearance,
though. :-)

And they were one of the main failure modes which brought sets back
for repair. One of the reasons I avoid physical relays.

But a thermal relay is a totally different animal from a conventional
electromagnetic relay. They have very slow make & break of the contacts,
and the characteristics of the bi-metal strip changes with age.

You may need to think more carefully about the application in the example
before assuming that is relevant. You could also check to see if the relay
was such that it flipped state with some hysteresis.

Your original PSU didn't need it either IME. :-)

As I said, you were lucky. I probably saw more of the sets than you did.
:-) Without the relay the surge peak applied was well above the rating of
the original bridge diodes. ...And the orginal PSU wasn't actually mine. It
was designed by Ted Rule. I just changed it a few years later to be cheaper
and far more reliable.

The particular problem was easily solved simply by using high surge rated
diodes. So far as I was concerned any mechanical relay at all was expensive
and nasty in such a situation, and easily avoided with far more reliable
solid state devices. Hence my mentioning it in this thread.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

HT Relay
 

In article , Phil Allison
wrote:

"Jim Lesurf"


During the first years of manufacture the ampliers/recievers in the
Armstrong 600 range used a thermal delay relay to avoid a surge when
the unit was switched on.

These were expensive. And they were one of the main failure modes
which brought sets back for repair. One of the reasons I avoid
physical relays. I replaced them in later sets with a better PSU that
simply didn't need a mechanical relay. Over the following few years it
was quite clear that this had a big impact on the reliability of the
sets.


** So the pig ignorant pommy ****wit was so stupid he used one of these ?

http://www.tpub.com/content/neets/14...4175_153_1.jpg

The kind on the left - I bet.

You lose you bet on both counts. :-)

I did not use them. I replaced them with something else.

Nor was that type used.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

HT Relay
 

"Jim Lesurf is a ****wit LIAR "

During the first years of manufacture the ampliers/recievers in the
Armstrong 600 range used a thermal delay relay to avoid a surge when
the unit was switched on.

** All you needed was a simple NTC thermistor.

You wanking IMBECILE !!!!!!!


These were expensive. And they were one of the main failure modes
which brought sets back for repair. One of the reasons I avoid
physical relays. I replaced them in later sets with a better PSU that
simply didn't need a mechanical relay. Over the following few years it
was quite clear that this had a big impact on the reliability of the
sets.


** So the pig ignorant pommy ****wit was so stupid he used one of these ?

http://www.tpub.com/content/neets/14...4175_153_1.jpg

The kind on the left - I bet.

You lose you bet on both counts. :-)

I did not use them. I replaced them with something else.

Nor was that type used.


** Really ?????

How ****ing typical of a grossly autistic **** like Jim Lesurf to only
ever ALLUDE to something while never saying what it is, so forcing folk to
make guesses.

Then he still refuses to be specific.

It must been an even stupider choice than the one above.

Hope the lying pommy **** gets cancer - ASAP.




...... Phil