AVO 8 Mk 4 ...

A

Arfa Daily

Guest
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and drawers
high and low, and can't find my book anywhere ... I thought that the 'net
would be awash with copies of the schematic, but it seems only for the Mk 2,
which is totally different to the MK 4.

TIA

Arfa
 
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
Click to expand...
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a Mk
II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com
 
"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a Mk
II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com
Click to expand...
Hi Robin, thanks for that. It would appear to be the correct one. Looks as
though you need to pay to become a member, so I will hold off for now until
all the feelers that I have out, run dry. It's really annoying because I
have owned the meter from new when I was an apprentice, and I have the book,
which has the schematic in it, carefully filed away somewhere, but I'm
buggered if I can now find it. It is in a box file, but said boxfile is not
where I know it should be. Even more annoying is that I have damaged the
meter by my own stupidity, so now have the need to fix it ... :-(

Arfa
 
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:5Rqlp.4508$o81.2161@newsfe28.ams2...
"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a Mk
II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks as
though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file, but
said boxfile is not where I know it should be. Even more annoying is that
I have damaged the meter by my own stupidity, so now have the need to fix
it ... :-(
Click to expand...
There may be an outside chance its turned up on
alt.binaries.e-book.technical at some time or other.

Whether I'd have downloaded it is another matter, and it would take a while
to search my archives.

You could try a REQ: on that group while I try to remember where I put all
the unsorted stuff.
 
Arfa Daily wrote:
"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

Have you tried:-
Click to expand...

http://www.megger.com/eu/index.php

And get a log on for the support pages?

They seem to be the sort of company who do product support properly. It
might even be worth giving them a call at their head office in Dover.

--
Tciao for Now!

John.
 
In message <Cqmlp.4035$KZ7.856@newsfe08.ams2> on Fri, 1 Apr 2011 16:45:37 +0100
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and drawers
high and low, and can't find my book anywhere ... I thought that the 'net
would be awash with copies of the schematic, but it seems only for the Mk 2,
which is totally different to the MK 4.
Click to expand...
Have you tried the Vintage Radio Forum?

http://www.vintage-radio.net/forum/index.php

They have a vintage test equipment forum and there are lots of nice, helpful
people on there ...

On the other hand, there's also me ...

--

Terry
 
In article <5Rqlp.4508$o81.2161@newsfe28.ams2>, Arfa Daily
<arfa.daily@ntlworld.com> writes

Even more annoying is that I have damaged the
meter by my own stupidity
Click to expand...
Measured the resistance of the mains?

BTDTGTTS.

--
(\__/)
(='.'=)
(")_(")
 
Arfa Daily wrote:
"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's
a Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one.
Looks as though you need to pay to become a member, so I will hold
off for now until all the feelers that I have out, run dry. It's
really annoying because I have owned the meter from new when I was an
apprentice, and I have the book, which has the schematic in it,
carefully filed away somewhere, but I'm buggered if I can now find
it. It is in a box file, but said boxfile is not where I know it
should be. Even more annoying is that I have damaged the meter by my
own stupidity, so now have the need to fix it ... :-(
Click to expand...
**I can't help you, but I do know that AVOs are bloody hard to damage. You
must have put considerable effort into it.


--
Trevor Wilson
www.rageaudio.com.au
 
On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote:

"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic, but
it seems only for the Mk 2, which is totally different to the MK 4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

Arfa
Click to expand...
That's too bad. I have some old gear I used as an apprentice that have a
high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801
freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other
things that I can't think of right now.



--
Live Fast Die Young, Leave A Pretty Corpse
 
In article <Cqmlp.4035$KZ7.856@newsfe08.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and
drawers high and low, and can't find my book anywhere ... I thought
that the 'net would be awash with copies of the schematic, but it seems
only for the Mk 2, which is totally different to the MK 4.
Click to expand...
Have you tried AVO direct? They still make the Model 8, IIRC.

--
*Dance like nobody's watching.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
 
"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in message
news:51bd54ef3adave@davenoise.co.uk...
In article <Cqmlp.4035$KZ7.856@newsfe08.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and
drawers high and low, and can't find my book anywhere ... I thought
that the 'net would be awash with copies of the schematic, but it seems
only for the Mk 2, which is totally different to the MK 4.

Have you tried AVO direct? They still make the Model 8, IIRC.

--
*Dance like nobody's watching.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
Click to expand...
Thanks all. Some useful suggestions there. You are of course all quite
correct in that it is very difficult to damage an AVO. This one is now
around 40 years old, and it has been in use on a daily basis for all of
those years, and has withstood much normal workshop abuse - yes, including
measuring the resistance of the mains ! - many times over. It was a very
high pulse voltage that caused the problem that I now have. I have recently
been working on some pro lighting equipment that makes use of short-arc
discharge lamps, and it is important that the running voltage, once they
have struck, is correct. They are fed with a 50% duty factor square wave at
about 200v p-p, resulting in an average 'AC' voltage of 100V across the
lamp. The AVO reads this nicely on either its 100V or 250V AC ranges. When
the lamp is being started, however, it is subjected to a pulsed igniter
voltage of several kV. When the lamp strikes, its impedance drops quite low,
and this swamps the igniter circuit and stops it. Stupidly, I had the meter
connected during the ignition sequence, and now, 100V of 'real' sinusoidal
AC reads about 35V ...

I am at this point thinking that it is going to be one of the two rectifier
diodes, which seem to be "OA" germanium types, but I guess it could also be
a fried metal film precision resistor. Needless to say, there is no visible
evidence of any problem :-\

Arfa
 
On Apr 1, 11:53 pm, "Trevor Wilson" <tre...@rageaudio.com.au> wrote:

**I can't help you, but I do know that AVOs are bloody hard to damage. You
must have put considerable effort into it.
Click to expand...
Not that hard. The overload cutout is a sensitive beast and the
adjustment procedure is a little convoluted.
 
Dave Plowman (News) used his keyboard to write :
In article <Cqmlp.4035$KZ7.856@newsfe08.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and
drawers high and low, and can't find my book anywhere ... I thought
that the 'net would be awash with copies of the schematic, but it seems
only for the Mk 2, which is totally different to the MK 4.

Have you tried AVO direct? They still make the Model 8, IIRC.
Click to expand...
They stopped making it about, oh - two or three years ago. I think too
expensive, too complex to make were the reasons quoted.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk
 
Harry Bloomfield wrote:
Dave Plowman (News) used his keyboard to write :
In article <Cqmlp.4035$KZ7.856@newsfe08.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Anybody got a copy of the schematic that's in the back of the user guide
that they can scan for me, please ? I've searched all my files and
drawers high and low, and can't find my book anywhere ... I thought
that the 'net would be awash with copies of the schematic, but it seems
only for the Mk 2, which is totally different to the MK 4.

Have you tried AVO direct? They still make the Model 8, IIRC.

They stopped making it about, oh - two or three years ago. I think too
expensive, too complex to make were the reasons quoted.

The last one came off the line in November 2008. This gave rise to
Click to expand...
simultaneous nostalgia and relief that reference quality meters now
weighed less than a sack of coal. ;-)

--
Tciao for Now!

John.
 
"Ian Field" <gangprobing.alien@ntlworld.com> wrote in message
news:c1rlp.2624$Pi.960@newsfe22.ams2...
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:5Rqlp.4508$o81.2161@newsfe28.ams2...


"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a Mk
II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

There may be an outside chance its turned up on
alt.binaries.e-book.technical at some time or other.

Whether I'd have downloaded it is another matter, and it would take a
while to search my archives.

You could try a REQ: on that group while I try to remember where I put all
the unsorted stuff.
Click to expand...
Thanks Ian. Be appreciated if you were able to have a quick look. Wouldn't
have been a problem back in our old TeleMag days. John would have flung an
ad in "Help Wanted" for me ... :)

Arfa
 
"Meat Plow" <mhywattt@yahoo.com> wrote in message
news:pan.2011.04.01.21.02.25@lmao.lol.lol...
On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote:

"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic, but
it seems only for the Mk 2, which is totally different to the MK 4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

Arfa

That's too bad. I have some old gear I used as an apprentice that have a
high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801
freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other
things that I can't think of right now.
Click to expand...
Yes, Meat. It's very frustrating. I cut my 'professional' teeth with that
meter, and it has served me faithfully over the years without serious
mishap. It is still in weekly use, but not quite the daily use that it once
was. For some types of repair, the swinging needle of a quality instrument
like this, is so much more appropriate than a digital type ...

Arfa
> --
 
Arfa Daily wrote:
"Meat Plow" <mhywattt@yahoo.com> wrote in message
news:pan.2011.04.01.21.02.25@lmao.lol.lol...
On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote:

"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic, but
it seems only for the Mk 2, which is totally different to the MK 4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

Arfa

That's too bad. I have some old gear I used as an apprentice that have a
high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801
freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other
things that I can't think of right now.




Yes, Meat. It's very frustrating. I cut my 'professional' teeth with
that meter, and it has served me faithfully over the years without
serious mishap. It is still in weekly use, but not quite the daily use
that it once was. For some types of repair, the swinging needle of a
quality instrument like this, is so much more appropriate than a digital
type ...
Click to expand...
Its a well known fact that the human eye can gain a rough ideas of
what's going on much faster with an analogue display, as it takes longer
to read a digital display, although in the end that is more accurate.

I have never felt the need for a DVM or DAM..99.99% of voltage and
current readings are of the 'is it within 20% of where it should be'
flavour.

The fact is an LCD meter is CHEAPER than a quality moving needle display.

Not better.

Arfa
--
Click to expand...
 
In article <mn.12727db4d00bbc3b.106911@NOSPAM.tiscali.co.uk>,
Harry Bloomfield <harry.m1byt@NOSPAM.tiscali.co.uk> wrote:
Have you tried AVO direct? They still make the Model 8, IIRC.

They stopped making it about, oh - two or three years ago. I think too
expensive, too complex to make were the reasons quoted.
Click to expand...
They were certainly very expensive last time I saw them for sale - about
700 quid? So most probably just bought for a museum or display purposes.

--
*Could it be that "I do " is the longest sentence? *

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
 
Not MK4 but MK3 is here:-
http://www.richardsradios.co.uk/avo8.html

MK4 on ebay but high priced (IMO):-
http://cgi.ebay.co.uk/Avo8-Mk4-Manual-Circuit-/270727895670#ht_500wt_1156
 
In message <5Rqlp.4508$o81.2161@newsfe28.ams2>, Arfa Daily
<arfa.daily@ntlworld.com> writes
"Robin" <see@sig.sep> wrote in message
news:97olp.1305$bT6.318@newsfe05.ams2...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but it seems only for the Mk 2, which is totally different to the MK
4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_universal_avometer_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
-- Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for
now until all the feelers that I have out, run dry. It's really
annoying because I have owned the meter from new when I was an
apprentice, and I have the book, which has the schematic in it,
carefully filed away somewhere, but I'm buggered if I can now find it.
It is in a box file, but said boxfile is not where I know it should be.
Even more annoying is that I have damaged the meter by my own
stupidity, so now have the need to fix it ... :-(
Click to expand...
http://www.vintage-radio.net/forum/showthread.php?t=756
---->
http://www.g1jbg.co.uk/service.htm
Any good?
--
Ian
 
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