I'm trying to find a modern CDS cells to replace these old timers (1982)
from the 70s, I did find a catalogue page for these CDS cells, but the
details are not as useful to me as perhaps they would be to someone
handy with using CDS cells.

The ratings are:
VT212L - 6 R1, 5 R2
VT212 - 7.8 R1, 5 R2

R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
R2 defined as min dark resistance (Megohms) in 5 sec.

Having a heck of a time matching these to more modern cds such as
carried by DK or Mouser. I tried the NSL-06S53, but its light resistance
is too sensitive and nothing else on DK was better.

Anyone have a VACTEK catalogue who could scan the pages that might help?

I suspect that PerkinElmer bought out Vactek as they used similar part
(VT200x) numbers as early as 2001 that I could find on web.archive.org,
but that archive doesn't have the parts books captured.

Bitsavers doesn't list it, nothing on ebay either...

Why am I bothering? I have a rifle gallery
(http://www.bonanzagallery.com/) that uses flash tubes in the rifles to
trip the cds cells in the targets and there are around 70 cds cells. A
number of them are failing so I want to replace them with something that
will work reliably.

Thanks as always for your time!

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

On 8/28/2024 8:19 PM, John Robertson wrote:
> I'm trying to find a modern CDS cells to replace these old timers (1982)
> from the 70s, I did find a catalogue page for these CDS cells, but the
> details are not as useful to me as perhaps they would be to someone
> handy with using CDS cells.
>
> The ratings are:
> VT212L - 6 R1, 5 R2
> VT212  - 7.8 R1, 5 R2
>
> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
> R2 defined as min dark resistance (Megohms) in 5 sec.
>
> Having a heck of a time matching these to more modern cds such as
> carried by DK or Mouser. I tried the NSL-06S53, but its light resistance
> is too sensitive and nothing else on DK was better.
>
> Anyone have a VACTEK catalogue who could scan the pages that might help?
>
> I suspect that PerkinElmer bought out Vactek as they used similar part
> (VT200x) numbers as early as 2001 that I could find on web.archive.org,
> but that archive doesn't have the parts books captured.
>
> Bitsavers doesn't list it, nothing on ebay either...
>
> Why am I bothering? I have a rifle gallery
> (http://www.bonanzagallery.com/) that uses flash tubes in the rifles to
> trip the cds cells in the targets and there are around 70 cds cells. A
> number of them are failing so I want to replace them with something that
> will work reliably.
>
> Thanks as always for your time!
>
> John :-#)#
>
>

Here's a possibility: diffuse the light hitting the
innards of the cds by painting or scratching its lens.
You could try sliding it across sandpaper - say 220 grit
for some specific distance - the see if the sensitivity
has been reduced the right amount. Or try translucent
paint. If you can get it to work properly with one cds,
the next step would be to set up a process where every
cds would be identically painted or scratched.

Ed

On 2024-08-29 10:57 a.m., ehsjr wrote:
> On 8/28/2024 8:19 PM, John Robertson wrote:
>> I'm trying to find a modern CDS cells to replace these old timers
>> (1982) from the 70s, I did find a catalogue page for these CDS cells,
>> but the details are not as useful to me as perhaps they would be to
>> someone handy with using CDS cells.
>>
>> The ratings are:
>> VT212L - 6 R1, 5 R2
>> VT212  - 7.8 R1, 5 R2
>>
>> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K
>> Source
>> R2 defined as min dark resistance (Megohms) in 5 sec.
>>
>> Having a heck of a time matching these to more modern cds such as
>> carried by DK or Mouser. I tried the NSL-06S53, but its light
>> resistance is too sensitive and nothing else on DK was better.
>>
>> Anyone have a VACTEK catalogue who could scan the pages that might help?
>>
>> I suspect that PerkinElmer bought out Vactek as they used similar part
>> (VT200x) numbers as early as 2001 that I could find on
>> web.archive.org, but that archive doesn't have the parts books captured.
>>
>> Bitsavers doesn't list it, nothing on ebay either...
>>
>> Why am I bothering? I have a rifle gallery (http://
>> www.bonanzagallery.com/) that uses flash tubes in the rifles to trip
>> the cds cells in the targets and there are around 70 cds cells. A
>> number of them are failing so I want to replace them with something
>> that will work reliably.
>>
>> Thanks as always for your time!
>>
>> John :-#)#
>>
>>
>
> Here's a possibility: diffuse the light hitting the
> innards of the cds by painting or scratching its lens.
> You could try sliding it across sandpaper - say 220 grit
> for some specific distance - the see if the sensitivity
> has been reduced the right amount.  Or try translucent
> paint. If you can get it to work properly with one cds,
> the next step would be to set up a process where every
> cds would be identically painted or scratched.
>
> Ed
I'm leaning towards IR filters - I believe the strobe tube puts out a
strong IR pulse and this may solve my problem.
Thanks!
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

On 29/08/2024 10:19 am, John Robertson wrote:
> I'm trying to find a modern CDS cells to replace these old timers (1982)
> from the 70s, I did find a catalogue page for these CDS cells, but the
> details are not as useful to me as perhaps they would be to someone
> handy with using CDS cells.
>
> The ratings are:
> VT212L - 6 R1, 5 R2
> VT212  - 7.8 R1, 5 R2
>
> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
> R2 defined as min dark resistance (Megohms) in 5 sec.
>
> Having a heck of a time matching these to more modern cds such as
> carried by DK or Mouser. I tried the NSL-06S53, but its light resistance
> is too sensitive and nothing else on DK was better.
>
> Anyone have a VACTEK catalogue who could scan the pages that might help?
>
> I suspect that PerkinElmer bought out Vactek as they used similar part
> (VT200x) numbers as early as 2001 that I could find on web.archive.org,
> but that archive doesn't have the parts books captured.
>
> Bitsavers doesn't list it, nothing on ebay either...
>
> Why am I bothering? I have a rifle gallery
> (http://www.bonanzagallery.com/) that uses flash tubes in the rifles to
> trip the cds cells in the targets and there are around 70 cds cells. A
> number of them are failing so I want to replace them with something that
> will work reliably.
>
> Thanks as always for your time!
>
> John :-#)#
>
>

Did you see ths document?:

https://www.worldradiohistory.com/Archive-Tele-Tech/60s/Electronic-Industries-1965-07.pdf

Page 84/85 of the pdf, or page 82/83 printed on the original.

It says
Type VT212
CdSe material
0.62 - 0.86 micron spectral limits (10% points)
0.74 micron peak sensitivity
0.21 inch diameter
0.146 inch depth
>0.5Meg dark resistance, 25 deg C
7.8kOhm at 2 ft-c T 2850K
50mW dissipation
70 Volt rating
at 0.1 ft-c resistance is 67% of room temperature resistance at 65 deg C
6ms rise time, 5ms decay time at 10 ft-c

On 2024-09-09 9:33 p.m., Chris Jones wrote:
> On 29/08/2024 10:19 am, John Robertson wrote:
>> I'm trying to find a modern CDS cells to replace these old timers
>> (1982) from the 70s, I did find a catalogue page for these CDS cells,
>> but the details are not as useful to me as perhaps they would be to
>> someone handy with using CDS cells.
>>
>> The ratings are:
>> VT212L - 6 R1, 5 R2
>> VT212  - 7.8 R1, 5 R2
>>
>> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K
>> Source
>> R2 defined as min dark resistance (Megohms) in 5 sec.
>>
>> Having a heck of a time matching these to more modern cds such as
>> carried by DK or Mouser. I tried the NSL-06S53, but its light
>> resistance is too sensitive and nothing else on DK was better.
>>
>> Anyone have a VACTEK catalogue who could scan the pages that might help?
>>
>> I suspect that PerkinElmer bought out Vactek as they used similar part
>> (VT200x) numbers as early as 2001 that I could find on
>> web.archive.org, but that archive doesn't have the parts books captured.
>>
>> Bitsavers doesn't list it, nothing on ebay either...
>>
>> Why am I bothering? I have a rifle gallery (http://
>> www.bonanzagallery.com/) that uses flash tubes in the rifles to trip
>> the cds cells in the targets and there are around 70 cds cells. A
>> number of them are failing so I want to replace them with something
>> that will work reliably.
>>
>> Thanks as always for your time!
>>
>> John :-#)#
>>
>>
>
> Did you see ths document?:
>
> https://www.worldradiohistory.com/Archive-Tele-Tech/60s/Electronic-
> Industries-1965-07.pdf
>
> Page 84/85 of the pdf, or page 82/83 printed on the original.
>
> It says
> Type VT212
> CdSe material
> 0.62 - 0.86 micron spectral limits (10% points)
> 0.74 micron peak sensitivity
> 0.21 inch diameter
> 0.146 inch depth
> >0.5Meg dark resistance, 25 deg C
> 7.8kOhm at 2 ft-c T 2850K
> 50mW dissipation
> 70 Volt rating
> at 0.1 ft-c resistance is 67% of room temperature resistance at 65 deg C
> 6ms rise time, 5ms decay time at 10 ft-c
>
>
Thanks!
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

On 2024-09-10 01:55, John Robertson wrote:
> On 2024-09-09 9:33 p.m., Chris Jones wrote:
>> On 29/08/2024 10:19 am, John Robertson wrote:
>>> I'm trying to find a modern CDS cells to replace these old timers
>>> (1982) from the 70s, I did find a catalogue page for these CDS cells,
>>> but the details are not as useful to me as perhaps they would be to
>>> someone handy with using CDS cells.
>>>
>>> The ratings are:
>>> VT212L - 6 R1, 5 R2
>>> VT212  - 7.8 R1, 5 R2
>>>
>>> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K
>>> Source
>>> R2 defined as min dark resistance (Megohms) in 5 sec.
>>>
>>> Having a heck of a time matching these to more modern cds such as
>>> carried by DK or Mouser. I tried the NSL-06S53, but its light
>>> resistance is too sensitive and nothing else on DK was better.
>>>
>>> Anyone have a VACTEK catalogue who could scan the pages that might help?
>>>
>>> I suspect that PerkinElmer bought out Vactek as they used similar
>>> part (VT200x) numbers as early as 2001 that I could find on
>>> web.archive.org, but that archive doesn't have the parts books captured.
>>>
>>> Bitsavers doesn't list it, nothing on ebay either...
>>>
>>> Why am I bothering? I have a rifle gallery (http://
>>> www.bonanzagallery.com/) that uses flash tubes in the rifles to trip
>>> the cds cells in the targets and there are around 70 cds cells. A
>>> number of them are failing so I want to replace them with something
>>> that will work reliably.
>>>
>>> Thanks as always for your time!
>>>
>>> John :-#)#
>>>
>>>
>>
>> Did you see ths document?:
>>
>> https://www.worldradiohistory.com/Archive-Tele-Tech/60s/Electronic-
>> Industries-1965-07.pdf
>>
>> Page 84/85 of the pdf, or page 82/83 printed on the original.
>>
>> It says
>> Type VT212
>> CdSe material
>> 0.62 - 0.86 micron spectral limits (10% points)
>> 0.74 micron peak sensitivity
>> 0.21 inch diameter
>> 0.146 inch depth
>>  >0.5Meg dark resistance, 25 deg C
>> 7.8kOhm at 2 ft-c T 2850K
>> 50mW dissipation
>> 70 Volt rating
>> at 0.1 ft-c resistance is 67% of room temperature resistance at 65 deg C
>> 6ms rise time, 5ms decay time at 10 ft-c
>>
>>
> Thanks!
>
> John :-#)#
>
I have a 1988 Clairex catalog that cross-references the VT212 and VT212L
to a Clairex CL903L, which is

6k +- 2k ohms @ 2 footcandles, 40M dark, 100VAC (peak), TO18 case.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On 2024-09-11 2:15 p.m., Phil Hobbs wrote:
> On 2024-09-10 01:55, John Robertson wrote:
>> On 2024-09-09 9:33 p.m., Chris Jones wrote:
>>> On 29/08/2024 10:19 am, John Robertson wrote:
>>>> I'm trying to find a modern CDS cells to replace these old timers
>>>> (1982) from the 70s, I did find a catalogue page for these CDS
>>>> cells, but the details are not as useful to me as perhaps they would
>>>> be to someone handy with using CDS cells.
>>>>
>>>> The ratings are:
>>>> VT212L - 6 R1, 5 R2
>>>> VT212  - 7.8 R1, 5 R2
>>>>
>>>> R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K
>>>> Source
>>>> R2 defined as min dark resistance (Megohms) in 5 sec.
>>>>
>>>> Having a heck of a time matching these to more modern cds such as
>>>> carried by DK or Mouser. I tried the NSL-06S53, but its light
>>>> resistance is too sensitive and nothing else on DK was better.
>>>>
>>>> Anyone have a VACTEK catalogue who could scan the pages that might
>>>> help?
>>>>
>>>> I suspect that PerkinElmer bought out Vactek as they used similar
>>>> part (VT200x) numbers as early as 2001 that I could find on
>>>> web.archive.org, but that archive doesn't have the parts books
>>>> captured.
>>>>
>>>> Bitsavers doesn't list it, nothing on ebay either...
>>>>
>>>> Why am I bothering? I have a rifle gallery (http://
>>>> www.bonanzagallery.com/) that uses flash tubes in the rifles to trip
>>>> the cds cells in the targets and there are around 70 cds cells. A
>>>> number of them are failing so I want to replace them with something
>>>> that will work reliably.
>>>>
>>>> Thanks as always for your time!
>>>>
>>>> John :-#)#
>>>>
>>>>
>>>
>>> Did you see ths document?:
>>>
>>> https://www.worldradiohistory.com/Archive-Tele-Tech/60s/Electronic-
>>> Industries-1965-07.pdf
>>>
>>> Page 84/85 of the pdf, or page 82/83 printed on the original.
>>>
>>> It says
>>> Type VT212
>>> CdSe material
>>> 0.62 - 0.86 micron spectral limits (10% points)
>>> 0.74 micron peak sensitivity
>>> 0.21 inch diameter
>>> 0.146 inch depth
>>>  >0.5Meg dark resistance, 25 deg C
>>> 7.8kOhm at 2 ft-c T 2850K
>>> 50mW dissipation
>>> 70 Volt rating
>>> at 0.1 ft-c resistance is 67% of room temperature resistance at 65 deg C
>>> 6ms rise time, 5ms decay time at 10 ft-c
>>>
>>>
>> Thanks!
>>
>> John :-#)#
>>
> I have a 1988 Clairex catalog that cross-references the VT212 and VT212L
> to a Clairex CL903L, which is
>
> 6k +- 2k ohms @ 2 footcandles, 40M dark, 100VAC (peak), TO18 case.
>
> Cheers
>
> Phil Hobbs
>
Thanks all, I think I have enough information now.
John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."