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 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. 
> Perhaps you meant a different article?
>
> On Monday, October 20, 2014 4:32:18 PM UTC-5, OrangeGlow wrote: 
>>
>> Here is the Otis document that has the info I've based my work on. Also, 
>> the 1C21 specs and a newspaper article.  These panels ended up as scrap 
>> because of the ionizing source added to lower the trigger voltage. 
>>
>> Tim Lang has been my supplier of tubes and info.  If you search for his 
>> posts on this list you will probably find more info. 
>>
>> Cheers, 
>> Tom 
>>
>> On 10/20/2014 11:47 AM, Joe Zatarski wrote: 
>> > 
>> 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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