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From the operational point of view, is there a notable difference between the following electron tubes?

Jan 955

JRC 955

Jan 955 VT121

JHY 955 VT121

I'm asking broadly about the main points (e.g.: frequency range, grid voltage, capacitance and likes). Taking into account the age of these parts and the difficulty to obtain datasheets, even a broad opinion based on some past experience will be welcome.

EDIT: There are the datasheets for the RCA955 tube and the Tung Sol 955 tube, which may or may not be related to the question.

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  • \$\begingroup\$ You're asking us to compare 4 different datasheet (all the data in a datasheet is an aspect of operation, maybe aside from storage conditions), without linking to a single one! We've got no clairvoyant abilities, we can't answer this stuff without datasheets, either. \$\endgroup\$ Jul 23 at 9:53
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    \$\begingroup\$ they still have datasheets; someone who's worked with four clones of the same RCA tube will probably have to look this up, just as well, using these datasheets, or own measurements. Now, finding someone with a notebook that contains notes that go beyond datasheet-specified performance, that would sound slightly unlikely in this community, to be completely honest! As you noticed, these things are 90 years old; they're really rarely the subject of electrical engineering these days: I think you'd have more luck in a tube-related hobbyist forum, that's where the relevant experience would be. \$\endgroup\$ Jul 23 at 10:05
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    \$\begingroup\$ I'll edit my question according to your remarks. \$\endgroup\$
    – MikeTeX
    Jul 23 at 10:36
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    \$\begingroup\$ thank you very much! I still find this very broad, but I think it helped a lot! \$\endgroup\$ Jul 23 at 11:18
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    \$\begingroup\$ I think @MarcusMüller has a point, it's a little broad. I have some old RCA (and other) tube books which very likely cover the 955, but I doubt there is little difference. The 3 letters preceding 955 refer to the manufacturer or source. JAN = Joint Army-Navy; JRC = Japan Radio Company. \$\endgroup\$ Jul 27 at 11:50
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the 955 tube is an acorn type developed by RCA and first appeared in 1935.The data sheet for the RCA 955 tube is available at the following site: https://frank.pocnet.net › sheets › 955

Also just Google "955 vacuum tube" to find additional information. Also Wikipedia has a long article discussing the tube.

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  • \$\begingroup\$ see my edit plz. \$\endgroup\$
    – MikeTeX
    Jul 23 at 14:36

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