Lamps?
 

Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they are
so expensive. These are just inexpensively made tiny bulbs with wire leads.

Any suggestions?

Bob

Bob wrote:
Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they are
so expensive. These are just inexpensively made tiny bulbs with wire leads.

Any suggestions?

Bob



Could they be 5 volts? If so, Mouser has some lamps with wire leads and
..094 diameter bulb. Search p/n 6833 and 7153.

-Bill M

Bob wrote:
Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they are
so expensive. These are just inexpensively made tiny bulbs with wire leads.

Any suggestions?

Bob



Could they be 5 volts? If so, Mouser has some lamps with wire leads and
..094 diameter bulb. Search p/n 6833 and 7153.

-Bill M

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.

Looking for tiny incandescent lamps for my TM-451A Kenwood.


Have you considered putting in a small clear LED with limiting resister
to the 6 volts? I've done this. Never have to replace a bulb again.



Ed

Looking for tiny incandescent lamps for my TM-451A Kenwood.


Have you considered putting in a small clear LED with limiting resister
to the 6 volts? I've done this. Never have to replace a bulb again.



Ed

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they are
so expensive. These are just inexpensively made tiny bulbs with wire leads.

Any suggestions?

The 272-1140 6V lamp from Radio Shark should work, if they still stock it.

Bob

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they are
so expensive. These are just inexpensively made tiny bulbs with wire leads.

Any suggestions?

The 272-1140 6V lamp from Radio Shark should work, if they still stock it.

Bob

James Robinson wrote:

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.


You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.

One thing that you should already realize is that the new ones will
eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

James Robinson wrote:

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.


You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.

One thing that you should already realize is that the new ones will
eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

Lizard Blizzard wrote:
James Robinson wrote:

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.



You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.


One thing that you should already realize is that the new ones will
eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I do that routinely at the shop where I work on TAD M-8's and MD-150's,
which use a similar scheme. However, you have to be sure to add
appropriate limiting resistors for each series string!

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

Lizard Blizzard wrote:
James Robinson wrote:

Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.



You might try a model train shop. The ones catering to people who build
their own locomotives have small bulbs of various voltages, though 1.5
and 12 volt are the most common. Prices range from $1 to $3 per bulb.


One thing that you should already realize is that the new ones will
eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I do that routinely at the shop where I work on TAD M-8's and MD-150's,
which use a similar scheme. However, you have to be sure to add
appropriate limiting resistors for each series string!

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they
are
so expensive. These are just inexpensively made tiny bulbs with wire
leads.

Any suggestions?
========
Suggest you have a look at QST -Sep 2003 , page 38 .
There you find an article : Solid-State Those Pilot Lamps , by AD5X

Since your bulbs have wire leads you can readily replace them by a LED (of
your desired coulour) and an appropriate resistor.
After that you can forget about replacement for ever .

Good Luck

Frank GM0CSZ / KN6WH

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but they
are
so expensive. These are just inexpensively made tiny bulbs with wire
leads.

Any suggestions?
========
Suggest you have a look at QST -Sep 2003 , page 38 .
There you find an article : Solid-State Those Pilot Lamps , by AD5X

Since your bulbs have wire leads you can readily replace them by a LED (of
your desired coulour) and an appropriate resistor.
After that you can forget about replacement for ever .

Good Luck

Frank GM0CSZ / KN6WH

In article , Lizard Blizzard wrote:

eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

--
Sven Weil
New York City, U.S.A.

In article , Lizard Blizzard wrote:

eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

--
Sven Weil
New York City, U.S.A.

Sven Franklyn Weil wrote:
In article , Lizard Blizzard wrote:


eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.


I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

Sven Franklyn Weil wrote:
In article , Lizard Blizzard wrote:


eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.


I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

Fred Nachbaur wrote:

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Cheers,
Fred

I noticed in the new Mouser catalog that there is a line of LED lamps
designed as direcet drop-ins for incandesent lamps. Horribly expensive
at this time.

-Bill

Fred Nachbaur wrote:

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Cheers,
Fred

I noticed in the new Mouser catalog that there is a line of LED lamps
designed as direcet drop-ins for incandesent lamps. Horribly expensive
at this time.

-Bill

"Fred Nachbaur" wrote in message
news:xe33b.61864$K44.43700@edtnps84...
That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Either blue or while LEDs have pretty high voltage. Of course, they
require current limiting, which requires an overhead of voltage...

Tim

--
In the immortal words of Ned Flanders: "No foot longs!"
Website @ http://webpages.charter.net/dawill/tmoranwms

"Fred Nachbaur" wrote in message
news:xe33b.61864$K44.43700@edtnps84...
That being said, there *is* an LED rated for operation directly from a 5
volt line. Unfortunately, it's a flasher.

Either blue or while LEDs have pretty high voltage. Of course, they
require current limiting, which requires an overhead of voltage...

Tim

--
In the immortal words of Ned Flanders: "No foot longs!"
Website @ http://webpages.charter.net/dawill/tmoranwms

To all who suggested LEDs, thanks for the suggestions but there is a
problem. These are not pilot lamps. They illuminate an LCD and need to be
controllable by a regulator circuit for intensity. LEDs aren't really
suited to this application, although some modification of the circuitry and
optics might make it work.

All I want to do is get some more incandescent lamps for this radio, and
keep it close to original.

Bob

To all who suggested LEDs, thanks for the suggestions but there is a
problem. These are not pilot lamps. They illuminate an LCD and need to be
controllable by a regulator circuit for intensity. LEDs aren't really
suited to this application, although some modification of the circuitry and
optics might make it work.

All I want to do is get some more incandescent lamps for this radio, and
keep it close to original.

Bob

In article ,
(Sven Franklyn Weil) wrote:

In article , Lizard Blizzard wrote:

eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

http://www.oxley.co.uk/lamps/bulb_replace.html

http://www.ledtronics.com/pages/News56.htm

http://www.ccrane.com/led_replacemen...ight_index.asp

and many more.

Al

--
There's never enough time to do it right the first time.......

In article ,
(Sven Franklyn Weil) wrote:

In article , Lizard Blizzard wrote:

eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.

I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!

Are there any 5 volt LEDs around?

http://www.oxley.co.uk/lamps/bulb_replace.html

http://www.ledtronics.com/pages/News56.htm

http://www.ccrane.com/led_replacemen...ight_index.asp

and many more.

Al

--
There's never enough time to do it right the first time.......

Lizard Blizzard wrote:
Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD
and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but
they are
so expensive. These are just inexpensively made tiny bulbs with wire
leads.

Any suggestions?


The 272-1140 6V lamp from Radio Shark should work, if they still stock it.

They have them. I just bought a pack a few weeks ago.

- Mike KB3EIA -

Lizard Blizzard wrote:
Bob wrote:

Looking for tiny incandescent lamps for my TM-451A Kenwood.

Apparently these are 6 V or so; there are four of them in series parallel
controlled by a regulator to vary intensity. They light up the LCD
and two
of them are burned out.

I have searched many of the usual sources and can't seem to locate
replacement lamps; as a last resort I could go to Pacific Parts but
they are
so expensive. These are just inexpensively made tiny bulbs with wire
leads.

Any suggestions?


The 272-1140 6V lamp from Radio Shark should work, if they still stock it.

They have them. I just bought a pack a few weeks ago.

- Mike KB3EIA -

"Sven Franklyn Weil" wrote in message
...
In article , Lizard Blizzard wrote:

Are there any 5 volt LEDs around?

Indeed there are. Check for panel lights or LED panel illuminators in any
good electronics catalog- they come in lamp style mounts. The units have
multiple dice inside and the proper dropping resistor in place already.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

"Sven Franklyn Weil" wrote in message
...
In article , Lizard Blizzard wrote:

Are there any 5 volt LEDs around?

Indeed there are. Check for panel lights or LED panel illuminators in any
good electronics catalog- they come in lamp style mounts. The units have
multiple dice inside and the proper dropping resistor in place already.

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

Bob wrote:

All I want to do is get some more incandescent lamps for this radio, and
keep it close to original.

email JKL Lamps and ask what they've got to meet your specs. If they
don't have it - you're in trouble- they have several THOUSAND types
available. You do have to go through one of their distributors - but
they'll tell you who has the lamp you want.

You're going to need to measure the bulb very carefully length &
diameter - is it round or cylindrical; wires out the bottom (standard)
or each end (axial)... and you're going to need the voltage and current
of one bulb.

JKL has wire base bulbs in 5 and 6 volts from T-3/4 size (.187 Long X
..094 diameter( to T-1 3/4 (.520 long X .230 diameter)...

the T-1 1/4 standard size come in
5V @21, 40, 60, 75, 115ma -
6V @ 40, 60, 200ma
6.3V @70 & 200ma -
life ave 10,000 - 100,000

This is the bunch that the has "fuse clip" bulbs in 6.3, 8 and 12V

email:

best regards...
--
randy guttery

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

Bob wrote:

All I want to do is get some more incandescent lamps for this radio, and
keep it close to original.

email JKL Lamps and ask what they've got to meet your specs. If they
don't have it - you're in trouble- they have several THOUSAND types
available. You do have to go through one of their distributors - but
they'll tell you who has the lamp you want.

You're going to need to measure the bulb very carefully length &
diameter - is it round or cylindrical; wires out the bottom (standard)
or each end (axial)... and you're going to need the voltage and current
of one bulb.

JKL has wire base bulbs in 5 and 6 volts from T-3/4 size (.187 Long X
..094 diameter( to T-1 3/4 (.520 long X .230 diameter)...

the T-1 1/4 standard size come in
5V @21, 40, 60, 75, 115ma -
6V @ 40, 60, 200ma
6.3V @70 & 200ma -
life ave 10,000 - 100,000

This is the bunch that the has "fuse clip" bulbs in 6.3, 8 and 12V

email:

best regards...
--
randy guttery

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

Sven Franklyn Weil wrote:

In article , Lizard Blizzard wrote:



eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.



I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!



Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs
myself....

Sven Franklyn Weil wrote:

In article , Lizard Blizzard wrote:



eventually burn out, too. So it would be wise to do the right thing and
replace them with LEDs, and they will last tens of thousands of hours.



I replaced a grain-of-wheat lightbulb for a clock-radio dial with one from
Radio Shack. The supply voltage is 5 volts so I bought a 12 volt bulb.

Imagine my surprise when these damned things are only rated for 15
hours!!!!



Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs
myself....

But the light output goes down with at least as strong a function, I
believe. So although you can greatly extend the life of a bulb by
reducing the voltage, you also greatly reduce the light output. And
without nearly as much of a reduction of the input power. So you end up
with a dim, very inefficient bulb. That might be ok for some
applications (say, if it's at the top of a tower where it's a really
major pain to change) but not others (like all the bulbs in your house,
unless you love to pay that electric bill).

Roy Lewallen, W7EL

Robert Casey wrote:

Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs
myself....

But the light output goes down with at least as strong a function, I
believe. So although you can greatly extend the life of a bulb by
reducing the voltage, you also greatly reduce the light output. And
without nearly as much of a reduction of the input power. So you end up
with a dim, very inefficient bulb. That might be ok for some
applications (say, if it's at the top of a tower where it's a really
major pain to change) but not others (like all the bulbs in your house,
unless you love to pay that electric bill).

Roy Lewallen, W7EL

Robert Casey wrote:

Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs
myself....

--- Bill --- wrote:
Fred Nachbaur wrote:

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a
5 volt line. Unfortunately, it's a flasher.

Cheers,
Fred


I noticed in the new Mouser catalog that there is a line of LED lamps
designed as direcet drop-ins for incandesent lamps. Horribly expensive
at this time.

-Bill

If you have a parts distributor nearby that stocks (or can order the
Mode line) you might find their variants marginally cheaper:

http://www.mode-elec.com/Products/Page_44-46.pdf

Distributor list he

http://www.mode-elec.com/Distributors/distributors.html

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

--- Bill --- wrote:
Fred Nachbaur wrote:

Any LED can be a 5 volt LED with an appropriate dropping resistor. ;-)

That being said, there *is* an LED rated for operation directly from a
5 volt line. Unfortunately, it's a flasher.

Cheers,
Fred


I noticed in the new Mouser catalog that there is a line of LED lamps
designed as direcet drop-ins for incandesent lamps. Horribly expensive
at this time.

-Bill

If you have a parts distributor nearby that stocks (or can order the
Mode line) you might find their variants marginally cheaper:

http://www.mode-elec.com/Products/Page_44-46.pdf

Distributor list he

http://www.mode-elec.com/Distributors/distributors.html

Cheers,
Fred
--
+--------------------------------------------+
| Music: http://www3.telus.net/dogstarmusic/ |
| Projects, Vacuum Tubes & other stuff: |
| http://www.dogstar.dantimax.dk |
+--------------------------------------------+

In article , Robert Casey wrote:
Well, the life of a bulb is roughly (rated voltage/operating voltage)^6
so (12/5)^6= 191 * 15 hours = 2865 hours. I'd call these 5V bulbs
myself....

Rob, I'm probably being dense but I don't follow the math. Then again
I was never really good at math.

what is the ^6? Elevated to the 6th power? So is this bulb going to
last a while?

P.S.: If it blows in my lifetime I'm not replacing it again. The only
reason I did so the first time was because the original had blown its
glass envelope (I _don't_ know why). Yikes!!

--
Sven Weil
New York City, U.S.A.