The AM Forum

I am trying to find out a bit more about the RCA 913 1" CRT tube used in early National scopes.
Does anyone have a site online where older tubes can be referenced as to date of introducion and other info?

Tnx - Bruce W1UJR

Bruce here are a couple of websites. They seem to be the only ones I could find.  Don't know if you've encountered them yet.

http://www.aade.com/tubepedia/1collection/tubepedia2.htm
http://uv201.com/Tube_Pages/rca_913_crt.htm

GL
Bob

Excellent, thanks Bob.

I did find the second site, but the first one you listed was the info I needed.
Seems the 913 tube was introduced in 1936, and the National CRM scope must have been produced right after.

I'm doing a piece on the National CRM series of scopes for Electric Radio, but have found little data, so thanks for the leads.
I have four of them fun lilttle scopes and they are most buzzardly.
I currently use one with my HRO station, black crackle and green phosper, real boatanchor glowage.

(http://www.io.com/~nielw/nat_list/crm.jpg)

(http://www.brucehowes.com/images/HRO%20Glow.jpg)

What kind of info do you need?  My 1956 handbook lists the tube with the electrical specs.

Thanks, did find the datasheet and year of introduction for the tube.
Mostly need info on the CRM, when it was introduced, used, price, etc.

-BRuce

The back of the manual says Net Price $11.10 Without Tubes.