Kodak 75000 Vacum tube or bulb

[Photo51]

i have several of these Kodak 75000 tubes, or bulbs? I wonder if anyone knows what they were used for?

 

[photog_ed]

Photodiode maybe? Can you post a picture?

 

[Leigh B]

Why are there two threads on the same subject? That's a no-no.

I already answered the first one.

- Leigh

 

[ic-racer]

Like this?
If so, the RCA Phototube guide suggests it is a 917 style used in "relays and measurements." Perhaps even a re-branded RCA 917.

 

[Leigh B]

Like this?

Looks just like the one I posted in the other thread, but mine is horizontal.

(there was a url link here which no longer exists)

- Leigh

 

[Photo51]

Like this?
If so, the RCA Phototube guide suggests it is a 917 style used in "relays and measurements." Perhaps even a re-branded RCA 917.

That is just what it looks like. Thanks for answering. I searched Google, and Duck and couldn't find any info on it. Posted other thread by mistake.

Still wonder what these were used for.
Got a box of vacuum tubes at an estate sale that had several of these 75000 in it.

 

[ic-racer]

Still wonder what these were used for.

I read "relays and measurements" as "densitometer." The other phototubes types were used for film soundtrack reproduction.

 

[Leigh B]

Here's the datasheet for the 917 from RCA's HB3 engineering reference:
https://frank.pocnet.net/sheets/049/9/917.pdf

I expect few folks will care, but it does give the dimensions for confirmation (scroll down).

- Leigh

 

[AgX]

They are the predessors to the photodiode.

 

[Kilgallb]

Not a predessesor, it is a photo diode, albeit in vacuum tube form.