60 Volts AC from ariel cable

[mike]

Neil wrote in news:qx8xcwbvuhcr.194oor2qmzes8$. [e-mail]:

Never mind, your face is nowhere near as red as...

mike

[EricP]

I knew you had quality, but they seem to have got bored and left us to die!

Rad tail! I missed that one. :(( Suppose we could get Brownie Points by bonding every bit of pipework, and please the purists in here.

Dunno! Sounds *bad*. And I don't know how to earth the thing.

Oh bum!

[EricP]

You can feel both of ours apparently. Mine gives you a nip but you have to be eathed to get it. So you think the source is the chassis of one or more of the tv's?

I also have a tv amplifier in my aerial but disconnecting that completely does nothing to the voltage.

[Bob Eager]

On my degree course, they preferred the term 'antenna'....!

[meow2222]

Simple solution is to earth the outer shield of the fixed aerial system wiring somewhere.

NT

[<me9]

You never see it wiv the two letters at the beginning combined these days.

ærial

now you do.

It'll be different after it's been through usenet though.

[<me9]

That's an american abomination, or else the appendages of an insect.

[Guy King]

The message from "Bob Eager" contains these words:

Only 'cos it's easier to spell.

[EricP]

That's not difficult for my stuff. Will do, and thanks for the input.

:))

[Bob Eager]

Not according to the OED.

[Guy King]

The message from contains these words:

Nope - I got a real dipthong here.

[gort]

^^^^^^^^^^^^

Years ago maybe. You would be hard pushed to find a ' chassis' in a modern TV, single pcb's rule and virtually all use a SMPSU now.

Dave

[meow2222]

there are still many live chassis sets in use. Also there are lots of more recent smpsu sets with rfifilters between L/N and local 'ground' which give similar result, 120v to aeirial via a capacitor.

NT

[robgraham]

My Panasonic TV gave me a nip when I installed it and made all the aerial terminals sit at 120v - ignore the comment about high impedance DVMs, it's only electrostatic voltmeters that collect high votage readings from thin air. I found that if I changed over line and neutral the aerial terminal went happily to 0v.

I wasn't at all happy about this and complained to the manufacturer about this - they ignored me and told me to go through the dealer and as it was an internet buy I just left the set on an extension lead with crossed over wires. When the set was out of warranty I swapped over the mains lead inside.

Rob

[Brian Sharrock]

Is a diphthong hand-wash-do-not-tumble-dry? Can one use that Proctor & Gamble stuff?

[gort]

By ' live' chassis you do mean one side taken to mains ?. Because most of those were valve sets and I have not come across a valve set for ages.

Dave

[meow2222]

Cue potted history...

Chassis is really a misplaced term for local ground, as modern tvs havent had metal chassis for years. But the term 'live chassis' is still standard in the repair world. The typical mains input for a 1980s tv is a bridge rectifier then reservoir cap (ignoring the filtering for the moment), which means the local ground is live. This is why earphone sockets were so few on these sets, to fit an ear/headphone socket meant either an iso tf for the socket (rare but occasionally done) or else a whole new isolated supply design, which was a fair bit more money.

This type of arrangement also applied to some of the older smpsu sets, such as the Philips G8, which had a live chassis non-iso smpsu. (Unusual type of smpsu as well.)

Many live chassis sets are still in use, mainly form the 80s.

Re valve sets, most were neutral chassis, which is generally called live chassis, but is a bit different. With 1980s live chassis sets the bridge rec means that no matter how you connect the mains lead, the chassis is always live. Thus almost everything in the set can electrocute if given a chance, including pot fixings etc. The older neutral chassis had the advantage that in nearly all cases, but not all, the chassis was harmless, so when owners fitted longer grub screws to fallen off knobs on metal spindle pots or kids put their hands round the back they mostly got away with it.

Universal sets were different again, as were isolated transformer sets like mine.

NT

[Guy King]

The message from "Brian Sharrock" contains these words:

Definitely drip-dry, do not iron.

[Weatherlawyer]

Bloody impossible to wash with though.

[Grimly Curmudgeon]

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Guy King saying something like:

Only here for the crack?