[GerryE123]

Hi:

I came across a strange, unknown tube. Here's a photo:

http://i27.photobucket.com/albums/c1...ye123/tube.jpg

On the bottom of the base it has the usual "licensed only to extent
indicated on carton". There are no pins, just the two leads coming out the
side of the base. As can be seen in the photo the letters/numbers
"AP-1337-C" are printed on the base. Also, printed on the base are some
much smaller numbers "147" over "?-2" (the glue covers the question mark
character).

Is this a home-made tube, an experimental tube or just a bad repair job?
Any idea of what kind of tube it is? Thanks.

Gerry

[Bob Weiss]

Looks to be a phototube. I've seen a few of them with the flying lead
connections before...

Bob Weiss N2IXK

GerryE123 wrote:
Hi:

I came across a strange, unknown tube. Here's a photo:

http://i27.photobucket.com/albums/c1...ye123/tube.jpg

On the bottom of the base it has the usual "licensed only to extent
indicated on carton". There are no pins, just the two leads coming out the
side of the base. As can be seen in the photo the letters/numbers
"AP-1337-C" are printed on the base. Also, printed on the base are some
much smaller numbers "147" over "?-2" (the glue covers the question mark
character).

Is this a home-made tube, an experimental tube or just a bad repair job?
Any idea of what kind of tube it is? Thanks.

Gerry

[Phil Allison]

"GerryE123"

I came across a strange, unknown tube. Here's a photo:

http://i27.photobucket.com/albums/c1...ye123/tube.jpg

Any idea of what kind of tube it is?


** Definitely looks like a " phototube " - you can Google the term for
more info.

Some were made with inert gas inside while others had a hard vacuum - were
once widely used as optical sensors and also in the sound heads of film
projectors.

I recall seeing one used as a slave flash trigger device for professional
photography.

Now been replaced by photo-resistors, ( ie CdS cells ) photo-transistors,
photo-diodes and small solar cells.



...... Phil

[GerryE123]

"Phil Allison" wrote in message
...

** Definitely looks like a " phototube " - you can Google the term for
more info.

I did just that after Bob's post and I found this photo:

http://cache.eb.com/eb/image?id=62961&rendTypeId=4

That sure looks like it! Thank you phil and Bob!

Gerry

[PeterD]

On Fri, 01 Aug 2008 22:17:41 -0400, Bob Weiss
wrote:

Looks to be a phototube. I've seen a few of them with the flying lead
connections before...

Bob Weiss N2IXK


Base looks homemade, IMHO. But clearly a phototube.