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6AX5GT NOS RCA radio amplifier vintage electron vacuum tubes 4 valve tested 6AX5    US $19.99

6AG7 NOS NIB RCA radio amplifier electron vacuum tubes 4 tested 6AG7GT VT 247    US $19.99

6AF11 RCA NOS radio amplifier electron vintage vacuum tubes 4 tube tested 6AF11    US $11.99

1S5 NOS Sylvania radio amplifier cb vintage electron vacuum 3 tubes tested 1S5    US $11.09

12AD6 RCA NOS radio amplifier electron vintage vacuum tubes 4 tube tested 12AD6    US $11.09

7B6 loctal radio amplifier vintage electron vacuum tubes 4 tube valve tested 7B6    US $13.49

7B8 loctal radio amplifier vintage electron vacuum tubes 4 tube valve tested 7B8    US $11.19

1959 RCA Power and Gas Tubes Radio Corp Electron    US $10.95

50C5 NOS Sylvania radio amplifier electron vintage vacuum tubes 4 tested sb HL92    US $68.99

TWO PACK WESTINGHOUSE 12AU6 RADIO ELECTRON TUBES    US $10.00

No 43 RCA NOS vacuum tubes radio amplifier vintage electron tested ST shape 243    US $9.49

Lot of 7 Vintage Assorted Electron Radio Tubes In Boxes    US $8.99

7G7 loctal radio amplifier vintage electron vacuum tubes 3 valves tested 7G7    US $14.89

7A5 Westinghouse loctal radio amplifier vintage electron vacuum tubes tested 7A5    US $9.99

6X5GT vacuum tubes amplifier vintage electron radio tube tested 6X5GT 6X5G 6X5    US $14.29

6SA7GT radio amplifier vintage electron vacuum tubes 3 tube tested 6SA7G 6SA7    US $11.69

50EH5 NOS Sylvania radio amplifier vintage electron vacuum 3 tubes tested 50EH5    US $19.69

6DT5 NOS Sylvania radio amplifier vintage electron vacuum 3 tubes tested 6DT5    US $10.99

6C4 RCA EC90 radio amplifier vintage electron vacuum tubes 4 tested 6C4 EC90    US $20.59

6AU6 RCA radio amplifier electron vacuum tubes 4 tested EF94 6AU6 vintage 6AU6A    US $16.59

12AU7 ECC82 IEC Mullard radio amplifier vintage electron vacuum tubes 3 12AU7A    US $59.19

12CA5 RCA NOS radio amplifier vintage electron vacuum tubes 4 valve tested 12CA5    US $14.69

6AX8 NOS RCA radio amplifier electron vintage vacuum tubes 3 tested 6AX8 sb 6U8A    US $11.99

6X8 RCA radio amplifier vintage electron vacuum tubes 4 valves tested 6X8 6X8A    US $14.39

6GN8 NOS RCA radio amplifier electron vintage vacuum tubes 3 tested 6GN8 sb 6EB8    US $14.39

6CL8A RCA NOS vacuum radio amplifier vintage electron tubes 5 valves tested 6CL8    US $14.39

6CH8 RCA NOS radio amplifier vintage electron vacuum tubes 4 valves tested 6CH8    US $11.99

6AV6 RCA radio amplifier vintage electron vacuum tubes 4 tube tested 6AV6 RCA    US $16.39

6BJ6 NOS RCA radio amplifier electron vintage vacuum tubes 3 tested 6BJ6A 6662    US $19.29

35 VINTAGE TUNG SOL ELECTRON VACUUM GLOBE TUBES AUDIO RADIO NOS    US $175.00

Set of two sylvania Raytheon radio electron tubes 6BQ6 6CU6 Untested    US $5.99

Set of two sylvania RCA radio electron tubes 6CK4 Untested    US $5.99

Set of two sylvania Admiral radio electron tubes 6BZ3 Untested    US $3.99

Set of two sylvania zenith radio electron tubes 6DE4 Untested    US $5.99

Set of two Zenith RCA radio electron tubes 6CJ3 6DW4B Untested    US $5.99

Set of two Sylvania radio electron tubes 6JZ8 Untested    US $5.99

Set of two RCA Sylvania radio electron tubes 6SA7 GT Untested    US $5.99

Set of two Westinghouse Philco radio electron tubes 6SL7 GT Untested    US $9.99

Set of two RCA radio electron tubes 6SJ7 Untested    US $6.00

Set of two sylvania Ken Rad glass radio electron tubes 6SC7 Untested    US $24.99

6C4 General Electric radio amplifier electron vacuum tubes 4 tested 6C4 EC90    US $15.79

63 Vacuum Electron Tubes Radio GE Sylvania RCA CEI Raytheon Vintage    US $36.00

Vacuum Electron Tubes Radio 52 Lindel GE Sylvania RCA Vintage    US $34.20

6BA6 EF93 RCA radio amplifier vintage electron vacuum tubes 3 tube tested 6BA6    US $13.19

6DA6 EF89 radio amplifier vintage electron vacuum tubes 3 tested mesh plates    US $37.79

VINTAGE ELECTRON RADIO TUBES PACKAGE    US $4.00

6KY8A NOS Sylvania radio amplifier vintage electron vacuum 3 tubes tested 6KY8    US $10.59

Vintage TUNG SOL ELECTRON TUBES Radio Electronics Characteristic Chart 1948    US $14.99

565 ELECTRON VACUUM RADIO TV TUBES With Cases    US $750.00

6CJ3 6DW4B NOS radio amplifier Zenith electron vacuum tubes 3 tested 6CJ3 6DW4    US $15.99

6BA11 NOS Zenith radio amplifier vintage electron vacuum 3 tubes tested 6BA11    US $10.59

Lot 159 Vintage Electron Radio TV Tubes RCA Sylvania GE US Navy Army ITT Admiral    US $495.00

Basic Radio The Essentials of ELECTRON TUBES AND THEIR CIRCUITS by Hoag    US $16.95

Pair of Vintage RCA Radiotron Electron Radio Tubes 6AS7G Tested Working    US $9.99

lot RCA 472 NOS new radio TV vintage electron vacuum tubes repairman caddy case    US $.99

vintage RADIO VACUUM AMPLIFIER ELECTRON TUBES CORNELL 6AN8 DELTA 5T8    US $5.99

Vintage 1949 Basic Radio Essentials of Electron Tubes Their Circuits by Hoag    US $4.99

Large Lot of Approx 125 Vintage Radio Electron Vacuum Tubes Most in box    US $49.99

My grandma's radio has an indicator that looks like aurora borealis?

I wonder how to make one myself because she wouldn't give it to me.The radio is old and big but beautiful so I wouldn't want to destroy it anyways.
In my opinion it has something to do with thermo-electron emission because it looks like a vacuum tube.

I think you are talking about a magic eye tube.
These are a variation of a cathode ray tube. It is a vacuum tube, where the electron beam hits a fluorescent screen, and the shape can be altered by a control voltage.

The type shown in the link below is the earlier round type, but during the early 1960s these were usually straight (rectangular) bars that could be used as a tuning indicator or an audio level bar graph for example, mainly for show. See the page on display patterns for the various types. This is in the time before digital electronics and integrated circuits, but served the same purpose as an led bar graph display, more or less..

My electron tube collection