27 Mar
2001
27 Mar
'01
5:28 p.m.
On Mar 27, 22:02, Mike Ford wrote:
Don't be silly. My crystal set had a germanium diode, and I bet Allison's
did too :-)
I do remember my father buying a Philips Compact Cassette recorder when
they were new and even cooler than my 7-transistor radio finished in red
artificial leatherette. A cassette recorder of the same model still
happily reads and writes tapes on some of my older home micros, despite
being old when they were new (if you see what I mean).
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
I'm old,
dirts older. When I was in school you were really cool of your
radio
had six transistors, cooler if it had FM and rich if your portable tape
Are you sure you weren't trying to impress people with the catwhisker on
your crystal set? ;) 
27 Mar
27 Mar
8:47 p.m.
I do remember my father buying a Philips Compact
Cassette recorder when
they were new and even cooler than my 7-transistor radio finished in red
artificial leatherette. A cassette recorder of the same model still
happily reads and writes tapes on some of my older home micros, despite
being old when they were new (if you see what I mean).
I got one of the GE portable cassette recorders in the early
70's and remember thinking how cool it was and I had a freind who's
father had a reel-reel deck that he actually let us use all the time.
I have had a couple of cars though that had tube AM radios in them!
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757
28 Mar
28 Mar
4:41 a.m.
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27 Mar
27 Mar
10:35 p.m.
I don't think Allison's quite that old but neither am I. I can remember
JFK's funeral on TV (BW Motorola) and they made one of the best Chevy's when
I was born (57) and I don't think Allison is much off from that. At least
she won't tell us I'm sure.
I had a crystal radio in my early teens that we built from a library book
and then I moved to a Hallicrafters multiband reciever w/ long dipole
antenna. I still have the radio but have to find the capacitor that blew and
doesn't allow audio into the preamp. Good thing I have the schematic, now I
just need time.
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Pete Turnbull
Sent: Wednesday, March 28, 2001 1:29 AM
To: classiccmp(a)classiccmp.org
Subject: Re: List spammer ID'd
On Mar 27, 22:02, Mike Ford wrote:
Don't be silly. My crystal set had a germanium diode, and I bet Allison's
did too :-)
I do remember my father buying a Philips Compact Cassette recorder when
they were new and even cooler than my 7-transistor radio finished in red
artificial leatherette. A cassette recorder of the same model still
happily reads and writes tapes on some of my older home micros, despite
being old when they were new (if you see what I mean).
--
Pete Peter Turnbull
Network Manager
Dept. of Computer Science
University of York
>I'm old, dirts older. When I was in
school you were really
cool of your
radio
had six transistors, cooler if it had FM and rich if your portable tape
Are you sure you weren't trying to impress people with the catwhisker on
your crystal set? ;) 
28 Mar
28 Mar
2:22 a.m.
On Wed, 28 Mar 2001 06:35:40 -0600 Russ Blakeman
<rhblake(a)bigfoot.com> wrote:
I had a crystal radio in my early teens that we built
from a library book
and then I moved to a Hallicrafters multiband reciever w/ long dipole
antenna. I still have the radio but have to find the capacitor that blew and
doesn't allow audio into the preamp. Good thing I have the schematic, now I
just need time.
Well, I can remember the days of 405-line TV here in
England. We watched it on a valve set made by Pye (now
part of Philips). By the time of the Moon landings we had
dual-standard 405/625 and VHF/UHF sets. Oh, and BBC 2 was
a new channel on UHF, 625-line only!
I started in electronics with PNP germanium transistors,
although a lot of valve radio and tape recording gear was
still around. My idea of "high-tech" shortly after that
was a 741 op-amp.
I've just done a lecture where I showed people an
acoustically-coupled modem (300 baud). I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
"...and you try to tell the young people that, and they
won't believe you!"
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
4:02 a.m.
----- Original Message -----
From: "John Honniball" <John.Honniball(a)uwe.ac.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, March 28, 2001 11:22 AM
Subject: Re: RE: List spammer ID'd
<snip>
part of Philips). By the time of the Moon landings we
had
dual-standard 405/625 and VHF/UHF sets. Oh, and BBC 2 was
a new channel on UHF, 625-line only!
Does this explain why old episodes of Dr. Who look so wacky on NTSC? :)
I started in electronics with PNP germanium
transistors,
although a lot of valve radio and tape recording gear was
still around. My idea of "high-tech" shortly after that
was a 741 op-amp.
I'd like to try to build a computer only using 741's...
I've just done a lecture where I showed people an
acoustically-coupled modem (300 baud). I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
I've got one of those! I've been scouring salvation armys for old style
phones for years. I miss those things, they weighed a ton, you knew when you
were holding one in your hands..
"...and you try to tell the young people that,
and they
won't believe you!"
Oh, aye... aye...
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
5:08 a.m.
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7:17 a.m.
On Wed, 28 Mar 2001, Jason McBrien wrote:
----- Original Message -----
From: "John Honniball" <John.Honniball(a)uwe.ac.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, March 28, 2001 11:22 AM
Subject: Re: RE: List spammer ID'd
<snip>
There is a thrift store locally that has about a dozen of those, but in the
touchtone version.
- don
part of Philips). By the time of the Moon
landings we had
dual-standard 405/625 and VHF/UHF sets. Oh, and BBC 2 was
a new channel on UHF, 625-line only!
Does this explain why old episodes of Dr. Who look so wacky on NTSC? :)
I started in electronics with PNP germanium
transistors,
although a lot of valve radio and tape recording gear was
still around. My idea of "high-tech" shortly after that
was a 741 op-amp.
I'd like to try to build a computer only using 741's...
I've just done a lecture where I showed
people an
acoustically-coupled modem (300 baud). I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
I've got one of those! I've been scouring salvation armys for old style
phones for years. I miss those things, they weighed a ton, you knew when you
were holding one in your hands.. "...and
you try to tell the young people that, and they
won't believe you!"
Oh, aye... aye...
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
31 Mar
31 Mar
12:05 a.m.
On 28-Mar-2001 Jason McBrien wrote:
----- Original Message -----
From: "John Honniball" <John.Honniball(a)uwe.ac.uk>
To: <classiccmp(a)classiccmp.org>
I spent a few months looking for an old black standard bell phone, from
back in the days that bell canada required you rent phones from them.
Finaly picked one up that someone had tossed into the garbage, fully
functionnal (though the finish is a bit messed) It was to replace the one
I had that got very smashed up (under embarrassing circumstances).
This fone is in the living room and is plugged in and usable. Why?
Short story : I was at a party a few years back. A riotous party of the
halloween sort. I wanted to call up a friend and the only phone in the
place had a rotary dial. What with my unfamiliarity with the number i was
phoning, certain substances that were coursing through my metabolism
(ahem) and the fact I was out of practice with rotary dial, I was unable
to compose the number. Since then, I've made sure to have a rotary dial
in the house and use it, for "practice".
I just wish I had a red version of this phone..... "I'll call them on the
Red Phone." :-)
-Philip
I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
I've got one of those! I've been scouring salvation armys for old style
phones for years. I miss those things, they weighed a ton, you knew when
you were holding one in your hands.. 
28 Mar
28 Mar
4:36 a.m.
Long time since I've heard vacuum tubes referred to as valves...
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of John Honniball
Sent: Wednesday, March 28, 2001 10:22 AM
To: classiccmp(a)classiccmp.org
Subject: Re: RE: List spammer ID'd
On Wed, 28 Mar 2001 06:35:40 -0600 Russ Blakeman
<rhblake(a)bigfoot.com> wrote:
I had a crystal radio in my early teens that we
built from a
library book
and then I moved to a Hallicrafters multiband
reciever w/ long dipole
antenna. I still have the radio but have to find the capacitor
that blew and
doesn't allow audio into the preamp. Good
thing I have the
schematic, now I
just need time.
Well, I can remember the days of 405-line TV here in
England. We watched it on a valve set made by Pye (now
part of Philips). By the time of the Moon landings we had
dual-standard 405/625 and VHF/UHF sets. Oh, and BBC 2 was
a new channel on UHF, 625-line only!
I started in electronics with PNP germanium transistors,
although a lot of valve radio and tape recording gear was
still around. My idea of "high-tech" shortly after that
was a 741 op-amp.
I've just done a lecture where I showed people an
acoustically-coupled modem (300 baud). I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
"...and you try to tell the young people that, and they
won't believe you!"
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
5:06 a.m.
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7:23 a.m.
On Wed, 28 Mar 2001, Russ Blakeman wrote:
Long time since I've heard vacuum tubes referred
to as valves...
You have missed much of Tony Duell's email?
- don
-----Original
Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of John Honniball
Sent: Wednesday, March 28, 2001 10:22 AM
To: classiccmp(a)classiccmp.org
Subject: Re: RE: List spammer ID'd
On Wed, 28 Mar 2001 06:35:40 -0600 Russ Blakeman
<rhblake(a)bigfoot.com> wrote:
I had a crystal radio in my early teens that we
built from a
library book
and then I moved to a Hallicrafters multiband
reciever w/ long dipole
antenna. I still have the radio but have to find the capacitor
that blew and
doesn't allow audio into the preamp. Good
thing I have the
schematic, now I
just need time.
Well, I can remember the days of 405-line TV here in
England. We watched it on a valve set made by Pye (now
part of Philips). By the time of the Moon landings we had
dual-standard 405/625 and VHF/UHF sets. Oh, and BBC 2 was
a new channel on UHF, 625-line only!
I started in electronics with PNP germanium transistors,
although a lot of valve radio and tape recording gear was
still around. My idea of "high-tech" shortly after that
was a 741 op-amp.
I've just done a lecture where I showed people an
acoustically-coupled modem (300 baud). I had to take an
old phone along to show how it would fit, because no-one
would imagine that now, with all phones being different
sizes.
"...and you try to tell the young people that, and they
won't believe you!"
--
John Honniball
Email: John.Honniball(a)uwe.ac.uk
University of the West of England
9:38 a.m.
----- Original Message -----
From: "Russ Blakeman" <rhblake(a)bigfoot.com>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, March 29, 2001 4:06 AM
Subject: RE: RE: List spammer ID'd
Long time since I've heard vacuum tubes referred
to as valves...
Stilll common useage in Oz and NZ, and also in England I believe. A
tube is something you put in a tyre
to most people here.
(Except for a Picture Tube - I guess Picture Valve doesn't have quite
the same ring to it)
If a person points to their tv and says "I think the tubes gone." This
is a standard response to a "Whats the problem" question
from a TV Tech by virtually any customer with an old
TV. Sometimes they
were even right. Some of the early (K9 and C9
chassis) Philips TV's have a problem where in old age, the tube
fractures around the neck under the yoke, letting air in gradually.
This eventually leads to a lightning display inside the neck when there
is enough air to let the HV electrodes flash over, and often the neck
simple falls off the rest of the tube.
The semi competent techs that used to make a fortune running around
fixing TV's in the pre
solid state era were often known as 'valve jockeys'.
Cheers
Geoff in Oz
12:08 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
On Mar 27, 22:02, Mike Ford wrote:
Don't be silly. My crystal set had a germanium diode, and I bet Allison's
did too :-)
So did mine, but my father built a real crystal set in the 1940's. Somewhere,
I have printed instructions on how to build one, down to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days? I have
a nephew that will be old enough to build one, soon. I figured on the diode
type, first, then, if he's still interested, show him how they did it when
Grandpa was a kid.
-ethan
-ethan
__________________________________________________
Do You Yahoo!?
Get email at your own domain with Yahoo! Mail.
http://personal.mail.yahoo.com/?.refer=text
I'm
old, dirts older. When I was in school you were really cool of your
radio had six transistors...
Are you sure you weren't trying to impress people with the catwhisker on
your crystal set? ;) 
3:24 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
On Wed, 28 Mar 2001, Ethan Dicks wrote:
I have printed instructions on how to build one, down
to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days? I have
[...]
My crystal radio used a germanium diode as well - it was one of those
Radio Shack kits back in the 1970's.... still have it somewhere.
Anyway, if you want to start from scratch at building one, crystals
are probably plentiful at the various "new age" & crafts shops. Last
time I checked, there were a few places still selling real "cats
whiskers" (no - you don't catch the neighbor's cat to get one of these
- that won't work). Did you try Antique Radio Supply? Several years
ago, they had catswhiskers listed in their catalog. Alas, they don't
appeart have a functional web site at this time.
--
Copyright (C) 2001 R. D. Davis Ancient guru who see future once say:
All Rights Reserved "wise man who meditate upon immortal wisdom
rdd(a)perqlogic.com 410-744-4900 of Bart Simpson's words: "Don't have a cow,
http://www.perqlogic.com/rdd man" will enjoy interesting life."
31 Mar
31 Mar
2:01 p.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Upon the date 12:24 PM 3/28/01 -0500, R. D. Davis said something like:
On Wed, 28 Mar 2001, Ethan Dicks wrote:
> I have printed instructions on how to build one, down to how to cut a
section
> of pipe/conduit with ears to screw it down to the
block of wood that you use
> as the base. Anyone know where to get a hunk of crystal these days? I
have
[...]
My crystal radio used a germanium diode as well - it was one of those
Radio Shack kits back in the 1970's.... still have it somewhere.
Anyway, if you want to start from scratch at building one, crystals
are probably plentiful at the various "new age" & crafts shops. Last
time I checked, there were a few places still selling real "cats
whiskers" (no - you don't catch the neighbor's cat to get one of these
- that won't work). Did you try Antique Radio Supply? Several years
ago, they had catswhiskers listed in their catalog. Alas, they don't
appeart have a functional web site at this time.
Website still works, R.D. I just ordered some parts today to finish
restoring a friend's '49 Ford radio.
http://www.tubesandmore.com/
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.antiquewireless.org/
2:25 p.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
mmm. phosphor-bronze wires. Um... Some kinds of guitar strings are
supposedly made, or more likely wound in this. Would that work for a
cats whisker?
Upon the date 12:24 PM 3/28/01 -0500, R. D. Davis said something like:
--
Jim Strickland
jim(a)DIESPAMMERSCUMcalico.litterbox.com
-----------------------------------------------------------------------
BeOS Powered!
-----------------------------------------------------------------------
On Wed, 28 Mar 2001, Ethan Dicks wrote:
> I have printed instructions on how to build one, down to how to cut a
section
> of pipe/conduit with ears to screw it down to
the block of wood that you use
> as the base. Anyone know where to get a hunk of crystal these days? I
have
[...]
My crystal radio used a germanium diode as well - it was one of those
Radio Shack kits back in the 1970's.... still have it somewhere.
Anyway, if you want to start from scratch at building one, crystals
are probably plentiful at the various "new age" & crafts shops. Last
time I checked, there were a few places still selling real "cats
whiskers" (no - you don't catch the neighbor's cat to get one of these
- that won't work). Did you try Antique Radio Supply? Several years
ago, they had catswhiskers listed in their catalog. Alas, they don't
appeart have a functional web site at this time.
Website still works, R.D. I just ordered some parts today to finish
restoring a friend's '49 Ford radio.
http://www.tubesandmore.com/
Regards, Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA cfandt(a)netsync.net
Member of Antique Wireless Association
URL: http://www.antiquewireless.org/
28 Mar
28 Mar
3:47 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Hi,
Ethan Dicks <ethan_dicks(a)yahoo.com> said:
Somewhere,
I have printed instructions on how to build one, down to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days? I have
a nephew that will be old enough to build one, soon.
Try the Xtal Set Society's website:
http://www.midnightscience.com/
for info. I'm in the middle of building one with a genuine reproduction
cat's whisker.
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
5:27 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Hi
One other thing that one can do to improve the sensitivity
of a crystal set is to slightly forward bias the diode.
I used a 100K pot across a 1.5 volt battery. I used a
10K isolation resistor and used a blocking capacitor
when using a dynamic head phone.
I also made traps for the strong stations ( I had two
that were real close ) so that I could get some of the weaker
ones. I also found an old scrap radio that used a
TRF front stages. I used this to make a two stage tuner
that improved the selectivity quite a bit. I wish
I'd save some of this stuff but it always seemed like
the next project needed the parts used in the first.
My favorite was a short wave regenerative set made
with a dual triode. I got the schematic from the "Boys
Life" magazine ( Boy Scout magazine ).
Dwight
3:50 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Ethan Dicks <ethan_dicks(a)yahoo.com> wrote:
So did mine, but my father built a real crystal set in the 1940's. Somewhere,
I have printed instructions on how to build one, down to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days? I have
a nephew that will be old enough to build one, soon. I figured on the diode
type, first, then, if he's still interested, show him how they did it when
Grandpa was a kid.
Hi
I built several crystal sets. One I built using a razor
blade and a piece of graphite from a pencil. It doesn't
work with stainless blades. You need one of the older
style "Blue Blades".
Most rock shops have some galena. With some lead and
sulfur, you can make your own galena.
Dwight
4:31 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Hi
I built several crystal sets. One I built using a razor
blade and a piece of graphite from a pencil. It doesn't
work with stainless blades. You need one of the older
style "Blue Blades".
Most rock shops have some galena. With some lead and
sulfur, you can make your own galena.
Dwight
A razor blade and pencil lead!?! Wow.. that is very cool! I am old
enough (errrgh... I never thought I would say that!) to know about using
germanium diodes (ala Crystal Radio Kits from that once wonderful store Radio
Shack), but a razor blade and pencil lead... How do you put it together?
Cheers,
Bryan
P.S. Are you good friends with MacGyver? ;-)
4:52 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Bryan Pope <bpope(a)wordstock.com> wrote:
Hi
I put the razor blade down with a thumb tack on a piece
of wood. I wrapped a few loops of 20 gauge copper wire
around the lead. The pencil lead is the cats whisker.
The blades do need to be the tempered steel,
not the stainless. That area with the thin colored
oxide is the best place to look for good rectification.
It was graphite lead out of a standard #2 wood pencil.
I never did determine the direction of the diode but
for the purposes of a crystal detector, it doesn't make
much difference. You did need to look for the best spot,
just like a galena crystal.
Dwight
Hi
I built several crystal sets. One I built using a razor
blade and a piece of graphite from a pencil. It doesn't
work with stainless blades. You need one of the older
style "Blue Blades".
Most rock shops have some galena. With some lead and
sulfur, you can make your own galena.
Dwight
A razor blade and pencil lead!?! Wow.. that is very cool! I am old
enough (errrgh... I never thought I would say that!) to know about using
germanium diodes (ala Crystal Radio Kits from that once wonderful store Radio
Shack), but a razor blade and pencil lead... How do you put it together? 
6:37 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
They are known as Foxhole Radios, and you can find more information by
using a web search engine.
-Lawrence LeMay
Bryan Pope <bpope(a)wordstock.com> wrote:
Hi
I put the razor blade down with a thumb tack on a piece
of wood. I wrapped a few loops of 20 gauge copper wire
around the lead. The pencil lead is the cats whisker.
The blades do need to be the tempered steel,
not the stainless. That area with the thin colored
oxide is the best place to look for good rectification.
It was graphite lead out of a standard #2 wood pencil.
I never did determine the direction of the diode but
for the purposes of a crystal detector, it doesn't make
much difference. You did need to look for the best spot,
just like a galena crystal.
Dwight
Hi
I built several crystal sets. One I built using a razor
blade and a piece of graphite from a pencil. It doesn't
work with stainless blades. You need one of the older
style "Blue Blades".
Most rock shops have some galena. With some lead and
sulfur, you can make your own galena.
Dwight
A razor blade and pencil lead!?! Wow.. that is very cool! I am old
enough (errrgh... I never thought I would say that!) to know about using
germanium diodes (ala Crystal Radio Kits from that once wonderful store Radio
Shack), but a razor blade and pencil lead... How do you put it together?
6:51 a.m.
New subject: Crystal Radios
Since we're mentioning unusual crystal radios such as the Foxhole radios,
I'll just mention that there is one other type that always interested me,
though I never actually built one. These crystal radios include a
transistor amplification section, which gets the power to drive the
transistor from the signal strength of other local AM stations.
-Lawrence LeMay
11:32 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
On Wed, 28 Mar 2001, Bryan Pope wrote:
He forgot to mention the safety pin.
bill
--
Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves
bill(a)cs.scranton.edu | and a sheep voting on what's for dinner.
University of Scranton |
Scranton, Pennsylvania | #include <std.disclaimer.h>
Hi
I built several crystal sets. One I built using a razor
blade and a piece of graphite from a pencil. It doesn't
work with stainless blades. You need one of the older
style "Blue Blades".
Most rock shops have some galena. With some lead and
sulfur, you can make your own galena.
Dwight
A razor blade and pencil lead!?! Wow.. that is very cool! I am old
enough (errrgh... I never thought I would say that!) to know about using
germanium diodes (ala Crystal Radio Kits from that once wonderful store Radio
Shack), but a razor blade and pencil lead... How do you put it together?
3:53 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
Anyone know where to get a hunk of crystal these days?
I have
a nephew that will be old enough to build one, soon. I figured on the diode
type, first, then, if he's still interested, show him how they did it when
Grandpa was a kid.
-ethan
www.midnightscience.com
From that site you will be able to find sources for
everything you need,
such as this interesting link:
http://members.aol.com/scottswim/larry.htm
-Lawrence LeMay
4:45 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
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29 Mar
29 Mar
5:30 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
I've heard that you can use pyrite cristals, and I tried it once
with cristals that formed on an old rotten lead-acid battery
but the result was not optimal. You should also experiment
with the wisker. Metals like silver and phosphor-bronze come
to mind. In essence anything that creates a PN-junction with
a low voltage drop (0.2 .. 0.3 V) should do the trick if the
ohmic resistance is not too high.
Sipke de Wal
--------------------------------------------------
"In the land of the blind .....
...... One-Eye is torchbearer"
--------------------------------------------------
http://xgistor.ath.cx
----- Original Message -----
From: Ethan Dicks <ethan_dicks(a)yahoo.com>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, March 28, 2001 4:08 PM
Subject: Crystal Radios (was Re: List spammer ID'd)
--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
On Mar 27, 22:02, Mike Ford wrote:
Don't be silly. My crystal set had a germanium diode, and I bet Allison's
did too :-)
So did mine, but my father built a real crystal set in the 1940's. Somewhere,
I have printed instructions on how to build one, down to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days? I have
a nephew that will be old enough to build one, soon. I figured on the diode
type, first, then, if he's still interested, show him how they did it when
Grandpa was a kid.
-ethan
-ethan
__________________________________________________
Do You Yahoo!?
Get email at your own domain with Yahoo! Mail.
http://personal.mail.yahoo.com/?.refer=text I'm
old, dirts older. When I was in school you were really cool of your
radio had six transistors...
Are you sure you weren't trying to impress people with the catwhisker on
your crystal set? ;) 
30 Mar
30 Mar
2:34 a.m.
New subject: Crystal Radios (was Re: List spammer ID'd)
At 06:08 AM 3/28/01 -0800, Ethan Dicks wrote:
So did mine, but my father built a real crystal set in
the 1940's. Somewhere,
I have printed instructions on how to build one, down to how to cut a section
of pipe/conduit with ears to screw it down to the block of wood that you use
as the base. Anyone know where to get a hunk of crystal these days?
The mineral is "galena", a lead ore that apparently had enough
interesting impurities to semi-conduct depending on where the
whisker floated. In SW Wisconsin, you can find it on the ground.
Raw, it's dull grey. It cleaves easily to expose shiny surfaces.
- John
28 Mar
28 Mar
4:18 a.m.
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6:43 a.m.
I remember my prep school trying to raise funds to buy a reel to reel video
recorder (1969). My dad said that it was a ridiculous idea - "no one will
ever want to record TV programmes"
--
Regards
Pete
-----Original Message-----
From: owner-classiccmp(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Tony Duell
Sent: 28 March 2001 19:19
To: classiccmp(a)classiccmp.org
Subject: Re: List spammer ID'd
I've even got a portable reel-to-reel _video_ recorder and camera that is
still operational. And a portable U-matic recorder in need of a little
TLC...
8433
days inactive
8437
days old
31 comments
22 participants
participants (22)
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