> I think that the best thing you can do is to ask the company who replaced it
> if they can help you with any schematics, otherwise you will have to draw one
> yourself from what you have left of the elevator panel and we can take it
> from there, then you will know what voltages you need and y
all my tubes have 2040 printed on them, all of them have a TD71 sticker,
and two say 425A5 on a sticker.
On Tuesday, October 21, 2014 1:55:29 PM UTC-5, Dekatron42 wrote:
>
> Here is a photo of a tube marked 2040 on the glass and 425A5 on the base
> http://www.radiomuseum.org/tubes/tube_2040.html
Here is a photo of a tube marked 2040 on the glass and 425A5 on the base
http://www.radiomuseum.org/tubes/tube_2040.html , I can't vote for its
authenticity but I have both types but not one with both markings.
I have also scraped away the black paint from 1C21s and they have an
identical const
Thanks for the clarification.
On Tuesday, October 21, 2014 1:48:36 PM UTC-5, I wrote:
>
> Tube Lore lists 2040 in the RCA section as A.K.A. 1C21.Ira.
>
>
>
> On 10/20/2014 4:32 PM, Joe Zatarski wrote:
>
> thanks, I had the Otis document, but no datasheet for these tubes. I don't
> believe
Tube Lore lists 2040 in the RCA section as A.K.A. 1C21.Ira.
On 10/20/2014 4:32 PM, Joe Zatarski wrote:
thanks, I had the Otis document, but no datasheet for these tubes. I
don't believe they are 1C21, but maybe they are close enough? I think
my tubes say 2040 on them. Also, that article s
thanks, I had the Otis document, but no datasheet for these tubes. I don't
believe they are 1C21, but maybe they are close enough? I think my tubes
say 2040 on them. Also, that article seems to be something current (2008)
whereas this elevator panel is from the 60's or 70's at the latest I think
https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/s720x720/10698438_610527725718483_574889276774171791_n.jpg?oh=19a589987217d977b1bd6405a114aa2a&oe=54BBBAE2&__gda__=1421665936_039f165285dbc97c5c6f11a9c75d96fe
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So I found an elevator control panel in the garbage. They were replacing a
broken one in the dorm next to mine. It appears to have 425A5 'touch tube'
trigger tubes instead of mechanical switches. I saw an old thread here about
them which had a bit of info. I think you need to connect a 150vac su
