""to common B-" is fine if thats what you are tying to on a return side, but
"to chassis" is the correct term in the case we were dealing with here.

I just want to break the habit many servicers have of saying "to GROUND" as
its definitely NOT "GROUND" unless you bond the chassis to ground...and, 90%
of the time its just not... and a goodly portion of the sets being restored
are indeed what can be called "hot chassis" or AC-DC sets... which, unless
converted to have a polarized plug with ground can not be referred to ever
as being grounded.

Mark Oppat

"Jim Mueller" wrote in message
...
How about COMMON? This would take care of the AC/DC sets with a floating
"ground", any set using the chassis as the power return connection, sets
with back bias, sets with printed circuit boards and no chassis, and
battery portables with nothing like an earth ground connection.
--
Jim Mueller

To get my real email address, replace wrongname with eportiz. Then
replace nospam with sacbeemail.

"John Byrns" wrote in message
...
In article ,
"Mark Oppat" wrote:


snip


Carter,
lets get in the habit of saying "to CHASSIS" rather than "to GROUND". I
mentioned this before in this group... its really the correct term to be
using,

"CHASSIS" sounds good for AC sets like the one being discussed here.

especially since sometimes we are working on "hot chassis" sets too.

How many "hot chassis" sets actually have a hot chassis? "GROUND" seems
more correct for "AC/DC" sets where the power line neutral is not
connected to the chassis, in the case of "AC/DC" sets "NEUTRAL" would
seem to be most accurate, except for those sets using full wave voltage
doublers, which calls for yet another word.


Regards,

John Byrns

--
Surf my web pages at, http://fmamradios.com/

Mark, it is worth noting that some modern high tech IC based equipment
is built on multilayer PC boards, and one of the layers is commonly
referred to as the "ground plane", and even in lesser equipment using
simple two sided boards, there are often large areas of foil referred to
as a "ground plane".

I think your condemnation of the term "ground" is misplaced given its
common usage even in the most modern technologically advanced equipment.
I think the problem is that you are confusing "ground" with "earth" and
they are not always the same thing.


Regards,

john Byrns


In article ,
"Mark Oppat" wrote:

""to common B-" is fine if thats what you are tying to on a return side, but
"to chassis" is the correct term in the case we were dealing with here.

I just want to break the habit many servicers have of saying "to GROUND" as
its definitely NOT "GROUND" unless you bond the chassis to ground...and, 90%
of the time its just not... and a goodly portion of the sets being restored
are indeed what can be called "hot chassis" or AC-DC sets... which, unless
converted to have a polarized plug with ground can not be referred to ever
as being grounded.

Mark Oppat

--
Surf my web pages at, http://fmamradios.com/

John,
I stand my "ground" here. "Ground" IS INDEED "earth", one is the USA term,
one is used in the UK and elsewhere most often. However, in antique
radios we should use the term "CHASSIS" if that is what you are tying onto,
or "B-", also called "Common Negative, or Common neg" when you are tying to
that.

Mark Oppat


"John Byrns" wrote in message
...
Mark, it is worth noting that some modern high tech IC based equipment
is built on multilayer PC boards, and one of the layers is commonly
referred to as the "ground plane", and even in lesser equipment using
simple two sided boards, there are often large areas of foil referred to
as a "ground plane".

I think your condemnation of the term "ground" is misplaced given its
common usage even in the most modern technologically advanced equipment.
I think the problem is that you are confusing "ground" with "earth" and
they are not always the same thing.


Regards,

john Byrns


In article ,
"Mark Oppat" wrote:

""to common B-" is fine if thats what you are tying to on a return side,
but
"to chassis" is the correct term in the case we were dealing with here.

I just want to break the habit many servicers have of saying "to GROUND"
as
its definitely NOT "GROUND" unless you bond the chassis to ground...and,
90%
of the time its just not... and a goodly portion of the sets being
restored
are indeed what can be called "hot chassis" or AC-DC sets... which,
unless
converted to have a polarized plug with ground can not be referred to
ever
as being grounded.

Mark Oppat

--
Surf my web pages at, http://fmamradios.com/

Mark Oppat wrote:

John,
I stand my "ground" here. "Ground" IS INDEED "earth", one is the USA term,
one is used in the UK and elsewhere most often. However, in antique
radios we should use the term "CHASSIS" if that is what you are tying onto,
or "B-", also called "Common Negative, or Common neg" when you are tying to
that.

I'd be careful with "B-" as that's sometimes not circuit common
(return) -esp. with output tubes needing a negative bias. Chassis is
also dangerous because most AA5s use an isolated circuit common - with
the only (active) parts tied to chassis being the tuning cap (and
sometimes associated trimmers) - which are RF coupled to circuit common
through a cap. Though line AC can couple "backwards" through those caps
- (if they aren't leaking) - their small value should limit any shock
current to "tingle" level. The last thing you'd want someone to do is
tie a typical AA5 common to the chassis... Yes I know - some are anyway
- but they *should* be isolated from the user by design - where a
floating AA5 isn't.

Just my .02
--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com

My post was intentionally mentioning that "B-" or "common neg" are NOT
necessarily "Chassis"... they are separate terms... sorry if that wasn't
clear.

Mark Oppat



"Randy or Sherry Guttery" wrote in message
. ..
Mark Oppat wrote:

John,
I stand my "ground" here. "Ground" IS INDEED "earth", one is the USA
term, one is used in the UK and elsewhere most often. However, in
antique radios we should use the term "CHASSIS" if that is what you are
tying onto, or "B-", also called "Common Negative, or Common neg" when
you are tying to that.

I'd be careful with "B-" as that's sometimes not circuit common
(return) -esp. with output tubes needing a negative bias. Chassis is also
dangerous because most AA5s use an isolated circuit common - with the only
(active) parts tied to chassis being the tuning cap (and sometimes
associated trimmers) - which are RF coupled to circuit common through a
cap. Though line AC can couple "backwards" through those caps - (if they
aren't leaking) - their small value should limit any shock current to
"tingle" level. The last thing you'd want someone to do is tie a typical
AA5 common to the chassis... Yes I know - some are anyway - but they
*should* be isolated from the user by design - where a floating AA5 isn't.

Just my .02
--
randy guttery

A Tender Tale - a page dedicated to those Ships and Crews
so vital to the United States Silent Service:
http://tendertale.com