Yes, that $265 price is in 1969 dollars, the MV2 was insanely expensive
when it was released. The MV2 was not really usable as an indicator
though... it can only be seen in a darkened room. The only evidence I have
ever found of them being used was in scientific experiments in the late
1960s. I
These LEDs are very dim...they can be seen as a dot of light from about 2
feet away in a normal indoor room, but sunlight renders them completely
invisible. The only time I have ever seen them used in a piece of equipment
was in a teletype tester as a panel indicator; the operator would have to
I am not sure if this is offtopic or not, if so, mods please remove. I have
recently come into possession of a small quantity of Monsanto MV1 LEDs...
the MV1 is the first commercially produced LED, released in 1968. I am
selling these for $12 dollars each; I figured I would try selling them here
Wow, that digital sundial is very impressive, and does look like it works
on the same principle. Building a larger digital display does seem like it
could solve most of the problems of making your own symbols... get a bunch
of surplus magnifiers, mount them in a frame, and drill a million holes
The Burroughs SD-11 sphericular display has historically been a pretty
mysterious device... it has incandescent bulbs and looks like a projection
display, but produces numbers using a dramatically different system.
Normally SD-11s are glued shut and can't be dissembled, but I had a damaged
one
I have read in multiple places that the screen electrode in the A201 is to
prevent fouling of the anodes with sputter material from the cathodes.
Regards
Richard Kline
On Saturday, February 16, 2013 7:16:00 AM UTC-5, Dekatron42 wrote:
>
> Hi All,
>
> Does anyone have a circuit diagram for the
On Saturday, February 16, 2013 7:16:00 AM UTC-5, Dekatron42 wrote:
>
> Hi All,
>
> Does anyone have a circuit diagram for the Russian Polyatron A-201 that
> they could share with me - I have the datasheet (a few different versions)
> and also some information from other books but nothing that
The obvious solution is to geek out completely and make a dekatron
watch that tells time in metric! Use two A108s and divide the day into
10 hours of 100 minutes, then have the first tube display hours and
the second 10s of minutes. Sure, nobody is going to be able to read
the thing, but once you g
There is a datasheet for most of the common Aurora displays (including
the FFD51) on this page. The pinouts are, unfortunately, completely
different from the 3015-F.
http://www.decadecounter.com/vta/articleview.php?item=67
Regards
Richard Kline
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The EZ10B is filled with hydrogen and seems to be incredibly unstable,
of the 10 I have bought over the years, six were DOA and another one
failed in storage. The EZ10A is filled with argon and seems to fare
much better from what I have seen, although I have still had a few
show up outgassed from E
I have bought around 100 OG3 tubes over the years and I would say that
about 25% of them have been duds, mostly from gas loss but some with
shorted cathodes and similar manufacturing errors. That said I have
never had an OG3 fail after it comes into my hands, as is common with
the 6909 and 6910. Ap
An IN-6 might be an interesting choice, though I have not tried it
myself; all of the lots of IN-6s on Ebay right now are for silly-huge
quantities that only make sense if you are going to build a dot matrix
display. I only used the MTX90's because they don't seem to get much
use in projects and it
I just completed a clock project that uses a tube I have been wanting
to build something out of for a long time, a Soviet-era ITS1A seven
segment display.
http://www.decadecounter.com/vta/articleview.php?item=1073
I did have a few tubeless kit versions of this clock for sale for $60,
but they sol
These are EL displays, they work in the same manner as the EL wire
that is commonly available nowadays, but spread out flat instead of
rolled in a wire. The Russians made lots of different EL displays but
they do not often come up on Ebay for sale. This is one of the more
unusual types, the strange
A disclaimer; I took the photo on the decadecounter.com website, and
the example provided to us by Terry Kennedy had the same manufacturing
errors as everyone else has noted. At the time I wrote the entry on
the website linked above, I was not aware that any other examples of
this display had the
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