On Dec 13, 6:50*am, Dave wrote:

- - RHF wrote:
- - Most Young People only know Chips [ICs] and Micro-Circuits
- - and may not even know about Transistors, Diodes etc.

- ????

Dave - Any You ? ? ? ? ? Is . . . . . ~ RHF

On Dec 13, 4:53�am, dxAce wrote:

Now now Steve. Not to butt in here ;-) but I thought you and Michael
made up a while ago.

Perhaps, but he's since become obnoxious again.



Steve's a good guy when he's sober, but the Holidays seem to drive him
to drink year-after-year. Check the archives and you'll see that
December is when Steve gets really aggressive. When Steve's in this
mood, Burr usually gets sucked into it as an accomplice. Maybe we
should all head up to Michigan and throw Steve a Christmas party. Do
you think he'd let us listen to those famous Drakes? ;-)

Merry Chistmas!

Mike
Louisville, KY

Mike wrote:

On Dec 13, 4:53�am, dxAce wrote:

Now now Steve. Not to butt in here ;-) but I thought you and Michael
made up a while ago.

Perhaps, but he's since become obnoxious again.


Steve's a good guy when he's sober, but the Holidays seem to drive him
to drink year-after-year. Check the archives and you'll see that
December is when Steve gets really aggressive. When Steve's in this
mood, Burr usually gets sucked into it as an accomplice. Maybe we
should all head up to Michigan and throw Steve a Christmas party. Do
you think he'd let us listen to those famous Drakes? ;-)

Merry Chistmas!

Thought you had me blocked, boy! You just screwed up and answered MY post.

LMFAO at the fat boy who pretended to have a PhD.

Run boy, run, before the tallow makers catch you.

In article ,
Billy Burpelson wrote:

RHF wrote:
On Dec 12, 12:03 pm, Billy Burpelson wrote:
Mike wrote:
Just thought I'd mention a project that I'm a part of. Here, at the
college where I teach, we've purchased several old Hallicrafter S-38s
off of eBay for our beginning Electronic Engineering students to get
some hands-on experience with communication electronics.
CAUTION! ---- SHOCK HAZARD!!!!!

You may or may not be familiar with the following:

The S-38s are basically 5 tube 'All American Five' radios that do not
have power transformers, but rather have one side of the AC line tied to
the chassis.

To add insult to injury, these radios have a METAL cabinet.

The only thing between the students receiving a severe (or fatal)
electrical shock is the 50 year old (read dry and crumbly) rubber
washers that Hallicrafters used between the chassis and metal cabinet.

If you've not replaced these washers or put on a polarized line plug
(and checked for correct polarity on the wall socket), you have a
potentially large liability problem on your hands.

Great idea, but bad choice of receiver (IMHO)...

BP - The Voice of Experience Speaks . . .
ZAP ! - Ouch That Hurt ;-{ ~ RHF

Dave wrote:

I burned a nasty hole in my "Electronics Technology" metal workbench at
PU with an S-38.

Isn't there an "A" variation with a proper transformer?

No. None of the 'S-38' series had transformers. Obviously however,
Hallicrafters had more upscale receivers that DID have transformers.

That might be the best answer. Adding a power transformer if there is
room for one.

--
Telamon
Ventura, California

On Sat, 13 Dec 2008 17:54:19 -0800, Telamon wrote:

In article ,
Billy Burpelson wrote:

RHF wrote:
On Dec 12, 12:03 pm, Billy Burpelson wrote:
Mike wrote:
Just thought I'd mention a project that I'm a part of. Here, at
the college where I teach, we've purchased several old
Hallicrafter S-38s off of eBay for our beginning Electronic
Engineering students to get some hands-on experience with
communication electronics.
CAUTION! ---- SHOCK HAZARD!!!!!

You may or may not be familiar with the following:

The S-38s are basically 5 tube 'All American Five' radios that do
not have power transformers, but rather have one side of the AC
line tied to the chassis.

To add insult to injury, these radios have a METAL cabinet.

The only thing between the students receiving a severe (or fatal)
electrical shock is the 50 year old (read dry and crumbly) rubber
washers that Hallicrafters used between the chassis and metal
cabinet.

If you've not replaced these washers or put on a polarized line
plug (and checked for correct polarity on the wall socket), you
have a potentially large liability problem on your hands.

Great idea, but bad choice of receiver (IMHO)...

BP - The Voice of Experience Speaks . . . ZAP ! - Ouch That Hurt ;-{
~ RHF

Dave wrote:

I burned a nasty hole in my "Electronics Technology" metal workbench
at PU with an S-38.

Isn't there an "A" variation with a proper transformer?

No. None of the 'S-38' series had transformers. Obviously however,
Hallicrafters had more upscale receivers that DID have transformers.

That might be the best answer. Adding a power transformer if there is
room for one.

A suitable external 1:1 isolation transformer might help.

In article ,
"Frank Dresser" wrote:

"Billy Burpelson" wrote in message
...

CAUTION! ---- SHOCK HAZARD!!!!!

You may or may not be familiar with the following:

The S-38s are basically 5 tube 'All American Five' radios that do not
have power transformers, but rather have one side of the AC line tied to
the chassis.

That's true of the original S-38, but early in the series Hallicrafters
switched to a seperate common bus wire and floated the chassis. I don't
remember exactly when the change started, may be with the S-38B. I'm
certain the S-38D had a floating chassis.


To add insult to injury, these radios have a METAL cabinet.

The only thing between the students receiving a severe (or fatal)
electrical shock is the 50 year old (read dry and crumbly) rubber
washers that Hallicrafters used between the chassis and metal cabinet.

The same thing could be said of an old lamp, especially a metal lamp.
What's to prevent a shock hazard? Just a roll of paper between the lamp
socket and the shell.


If you've not replaced these washers or put on a polarized line plug
(and checked for correct polarity on the wall socket), you have a
potentially large liability problem on your hands.

Actually, putting in a polarized plug, by itself, won't help much. The
power switch is on the volume control and transformerless radios typically
switched the neutral in order to reduce hum pickup from the hot wire. Even
with the radio switched off, the chassis can still be energized with AC
through the tube filaments. There's also an antenna coupling capacitor
which should be changed.


Great idea, but bad choice of receiver (IMHO)...

Anyone who can learn radio can, and should, learn safety.

And plugging these old radios into modern GFCI protected outlets would
provide a good margin of safety.

I was going to ask you what the earth ground was supposed to be
connected to for the GFCI but you answered it in this post. The outside
metal cabinet. This is fine with the radio assembled but what about
while it is being worked on outside of the cabinet and connected to test
equipment? The only answer I know of here is an isolation transformer.

You cab easily have potentials between the test equipment chassis and
the radio if the equipment is plugged into another circuit, and mention
you could have ground loops.

--
Telamon
Ventura, California

Michael "I'm a college professor with a PhD" Bryant wrote:

On Dec 13, 12:24�pm, dxAce wrote:

Thought you had me blocked, boy! You just screwed up and answered MY post.

LMFAO at the fat boy who pretended to have a PhD.

Run boy, run, before the tallow makers catch you.- Hide quoted text -

- Show quoted text -

As you pointed out before, I using the Google web page to read this
newsgroup, so blocking isn't really an option. I just try my best to
not read your posts, Steve. Happy drinking!

Bryant, you're a well known liar and the PhD incident is merely the tip of the
iceberg.

Hopefully, the honchos at Louisville Technical Institute, and even more
importantly those who spend their hard earned dollars at same, will toss your
sorry fat ass out into the streets of Louisville.

Personally, I think that it's a real shame that those of your ilk are allowed to
"instruct" the young people of this country.

"Telamon" wrote in message
...

I was going to ask you what the earth ground was supposed to be
connected to for the GFCI but you answered it in this post. The outside
metal cabinet. This is fine with the radio assembled but what about
while it is being worked on outside of the cabinet and connected to test
equipment? The only answer I know of here is an isolation transformer.

You cab easily have potentials between the test equipment chassis and
the radio if the equipment is plugged into another circuit, and mention
you could have ground loops.


That's right, I use an isolation transformer when I'm serviceing the radio.

Frank Dresser

dxAce wrote:

Mike wrote:

On Dec 13, 12:24�pm, dxAce wrote:
Thought you had me blocked, boy! You just screwed up and answered MY post.

LMFAO at the fat boy who pretended to have a PhD.

Run boy, run, before the tallow makers catch you.- Hide quoted text -

- Show quoted text -
As you pointed out before, I using the Google web page to read this
newsgroup, so blocking isn't really an option. I just try my best to
not read your posts, Steve. Happy drinking!

Happy lying!


Google wants to rule you. I suggest you find a safer method of relating
to the internets..