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7059 tubes NOS 5 pcs Sylvania    US $19.99

7061 tubes NOS 5 pcs RCA Sylvania    US $17.99

7025 Dynascan 12AX7A radio amplifier vintage electron vacuum tube valve tested    US $24.99

6350 DuMont radio amplifier vintage electron vacuum tubes 3 tested 6350 black pl    US $39.99

5687 DuMont radio amplifier vintage electron vacuum tubes 4 tested 5687 black pl    US $99.99

5751 General Electric radio amplifier electron vacuum tubes 3 tested 12AX7A 5751    US $89.99

PENTA PL172 PL8295 PENTA LAB POWER TRANSMITER PENTRODE ELECTRON TUBE    US $175.00

JAN 4B24 CONTINENTAL ELECTRIC CO ELECTRON RADIO TUBE    US $10.00

Vintage Amperex Electron Vacuum Tube 6GY6 6GX6 NOS    US $2.00

Vintage Radio Shack Realistic Lifetime Electron Vacuum Tube 6FQ7 6CG7 NOS    US $5.00

GE General Electric 5814 12AU7 Tube Tested 5 Star    US $29.00

Miniatron Relay Electron Tube XT45A FSE F9031A 63V    US $14.00

3V4 AA5 radio amplifier vintage transoceanic electron vacuum 4 tubes valves DL94    US $16.49

3S4 AA5 radio amplifier vintage electron vacuum 4 tubes valves 3S4 tested DL92    US $14.99

3A4 AA5 radio amplifier vintage electron vacuum 4 tubes valves 3A4 tested DL93    US $11.99

1U5 AA5 radio amplifier vintage transoceanic electron vacuum 4 tubes valves 1U5    US $14.99

1R5 AA5 radio amplifier transoceanic vintage electron vacuum 3 tubes tested 1R5    US $9.99

1T4 AA5 RCA radio amplifier vintage electron vacuum tubes 4 valves tested 1T4    US $14.49

1x R209 RT Tube Lampe TSF Röhre Valvola NOS    US $99.99

7360 Tube Used Tested    US $15.99

5879 Tube NOS Tested    US $6.49

No 6AV5GA Vacuum Tube RCA Electron Tested Good 170    US $7.50

Sylvania 6BG6 GA Vacuum Electron Tube    US $8.99

kit of 12 BIANCHI mustard 10nF 22nF 33nF 47nF 56nF 68nF 150nF 220nF Marshall JTM    US $48.00

NOS TUNG SOL 5J6 VINTAGE ELECTRON TUBE RADIO    US $4.99

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

1957 RCA Receiving Type Tubes Industry Communications    US $10.95

RCA RECEIVING TUBE MANUAL    US $19.99

RCA Receiving Tube Manual    US $39.90

8458 NOS Amperex USA tube    US $36.00

4X150D EIMAC sealed NOS tube made in USA mil spec NIB    US $65.00

7554 NOS pencil triode tube USA MIL SPEC sealed NIB microwave up to 4 GHZ    US $65.00

NOS RCA BRAND RADIOTRON ELECTRON TUBE 5Y3GT TV RADIO TUBE IN BOX    US $11.50

NOS 4 RCA BRAND ELECTRON TUBE 6AZ8 6AN8 6AR5 6CL6 TV RADIO TUBE IN BOX    US $11.50

3 NOS RCA BRAND ELECTRON TUBE 42KN6 35LR6 6JF6 TV RADIO TUBE IN BOX    US $11.50

3 NOS RCA BRAND ELECTRON TUBE 12X4 12DT8 12BZ7 TV RADIO TUBE IN BOX    US $11.50

NOS Telefunken EF804S SINGLE Diamond tube for V72 Preamp or Microphone QUIET    US $98.00

TWO PACK WESTINGHOUSE 12AU6 RADIO ELECTRON TUBES    US $10.00

NOS RCA brand Electron Tube 6CB6A Radio Tube in Box Never Used        US $2.99

NOS RCA brand Electron Tube 5AM8 Radio Tube in Box Never Used        US $3.99

NOS RCA brand Electron Tube 6JV8 TV Radio Tube in Box Never Used       US $2.99

NOS Pro Comm Brand Electron Tube 6GN8 6EB8 Radio Tube in Box Never Used    US $2.99

1x EF80 6BX6 Z719 RT NOS Tube Röhre Valvola Lampe TSF Valvula    US $19.99

4HA7 NOS NEW IN THE BOX EMERSON TUBE 4HC7 NIB TESTED    US $5.25

NOS Westinghouse Brand Electron Tube 12AF3 TV Radio Tube in Box Never Used    US $4.99

NOS Westinghouse Brand Electron Tube 6AF4 TV Radio Tube in Box Never Used    US $1.99

NOS RCA brand Electron Tube 11Y9 TV Radio Tube in Box Never Used    US $1.99

a very rare VT 4 C UNITED ELECTRONICS 211 USA audio triode good for Ongaku    US $950.00

1000 pieces 3A5 RCA audio dht dual triode tubes 7pin USA 1976 made NOS NIB LOT    US $2,860.00

GL 8020 GE ELECTRON RADIO TUBE NOS    US $20.00

NOS Rauland Brand Electron Tube 6DZ4 TV Radio Tube in Box Never Used    US $4.99

NOS SEARS Brand Electron Tube 17HB25 TV Radio Tube in Box Never Used    US $3.99

NOS Mullard Telefunken ECF86 BLACKBURN UNITED KINGDOM    US $24.00

Vintage NOS Radio TV Vacuum Tube United Electron 6BC4    US $20.00

6712 BX3000 Beam Switching Tube Burroughs USA NOS Trochotron Rare    US $47.95

1 NOS RCA Electron Vacuum Radio Tube 50Y6 GT in Box    US $5.00

NEW IN BOX PHILCO 6KU8 STAR LIGHT TUBE 6ET7 NOS NIB    US $3.99

1x 4687 RT Tube Lampe TSF Röhre Valvola NOS    US $39.99

1x GZ41 RT NOS Tube Röhre Lampe TSF Valvola Valvula    US $24.99

RCA Electron Tube 3 Sets of 5 15 total    US $59.99

AN INTRODUCTION TO ELECTRONICS 1946 CD RG Hudson    US $6.99

RADIO ENGINEERING MAGAZINE OCT 1930 ELECTRON TUBE RELAYS VACUUM TUBE RADIO    US $12.00

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

Vintage Electronic Tube Radio Repair Part 452 1310    US $10.95

1x 6AM6S 6AM6 EF91 PM07 SFR NOS Tube Röhre Valvola Lampe TSF Valvula    US $19.99

GE 6AK5 EF95 NOS Vacuum Tube    US $12.99

1x 50V 500M RADIO CELSIOR NOS Tube Röhre Lampe TSF Valvola Valvula    US $29.99

50 pieces 5R4WGY CHATHAM USA sealed box 1952 made NOS lot 5R4 WGY EXCELLENT    US $585.00

1x 85A1 0E3 CV431 RT Tube Röhre Lampe TSF Valvola NOS    US $19.99

RCA 17JB6A Vacuum Electron Tube    US $9.99

EB4 MEB4 RT Tube Röhre Lampe TSF Valvola NOS    US $49.99

1x EZ4 4651 TEZ4 RT NOS Tube Röhre Lampe TSF Valvola Valvula    US $49.99

6BJ6 JAN tubes NOS boxed one sleeve of 5 tubes    US $48.00

500X Mustard BIANCHI Philips Spain 0047uF 1000V capacitors LOT for Marshall    US $980.00

RCA VT 200 vintage TUBE NOS    US $14.99

NOS 6v6gt CBS HYTRON TUBE RADIO AMP ELECTRON    US $14.99

6AN8A Vacuum Electron Tube    US $8.99

Mixed Lot 7 6CG7 Electron Tubes    US $59.99

3 RCA 6SN7 GT Vacuum Electron Tubes 6SN7GT    US $59.99

Sylvania 6CD6GA Vacuum Electron Tube    US $8.99

Motorola 6V6GT Vacuum Electron Tube    US $14.99

VINTAGE ELECTRON RADIO TUBES PACKAGE    US $4.00

EZ81 6CA4 vacuum tubes 4 pcs rectifier RCAGE NOS    US $149.90

RCA 5R4G 5R4GYB 5R4 5U4G 5U4GB BLACK PLATE 1960 Amp Audio Vacuum Tube Valve    US $23.64

6U8 6U8A 6KD8 radio tubes NOS 5 pcs assorted brands beautiful quality    US $28.99

6688 E180F radio tubes NOS GE Amperex Mullard 7 pcs    US $34.99

5654W 6AK5 radio tubes 5 pcs NOS    US $14.99

Vintage RCA 57 48 Radiotron Electron Tube    US $7.99

3xEM4 electron tubes valve röhre 10off sale TUNGSRAM strong    US $42.00

19xECL80 NOS electron tubes valve röhre 10off sale TUNGSRAM strong    US $85.00

164xEF80 electron tubes valve röhre TUNGSRAM Vacuum Pentode RF IF Stage    US $99.00

NOS RCA electron radiotron tube 6GE5 TV radio television    US $5.25

NOS National Union electron tube 6K5GT TV radio television    US $5.25

NOS Cunningham electron tube CL 14 CL14 CL 14 TV radio television    US $5.25

NOS Sylvania electron tube 56 radio TV television electronic    US $10.25

NOS Sylvania electron tube 35Z5GT 35Z5 GT TV radio television    US $5.25

NOS TUNG SOL electron tube 35Z5GT 35Z5 GT TV radio television    US $5.25

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..

Basic Radio: the Essentials of Electron Tubes and Their Circuits Sale Price: $15.00   Eligible for free shipping! Availability: Usually ships in 1-2 business days

BASIC RADIO VOL. 3 ELECTRON TUBE CIRCUITS Sale Price: $2.33   Eligible for free shipping! Availability: Usually ships in 1-2 business days