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 you
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
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 they are
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
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 ,
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
https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/s720x720/10698438_610527725718483_574889276774171791_n.jpg?oh=19a589987217d977b1bd6405a114aa2aoe=54BBBAE2__gda__=1421665936_039f165285dbc97c5c6f11a9c75d96fe
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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
