515

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Tektronix 515
15 MHz Tube scope
Tektronix 515 front

Produced from 1955 to (?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 515 is a 15 MHz single-trace all-tube oscilloscope introduced in 1955. It does not use plug-ins.

A rack-mount version, the RM15, was also sold. There is also a 515A (serial numbers 101 through 1000 are "Type 515", 1001 and upward are "Type 515A").

The 515A has a Z-axis input and slightly higher vertical sensitivity than the 515. Maximum vertical sensitivity is 100 mV/div for the 515 and 50 mV/div for the 515A. The 516 is essentially a dual-trace version of the 515.

The 515 and 515A are fan-cooled, both in benchtop and rackmount forms. They have a 137 °F (58 °C) thermal cut-off.

Key Specifications

Channels One vertical channel (two input connectors and a switch to select)
Bandwidth DC to 15 MHz
Rise time 23 ns
Deflection 50 mV/div to 20 V/div (515A), 100 mV/div to 50 V/div (515)
Sweep 0.2 μs/div to 2 s/div
CRT T55 CRT CRT, P31 phosphor standard (P2 in early version), 6 cm linear vertical deflection, 4 kV acceleration
Input impedance 1 MΩ // 30 pF
Power 275 W
Weight 40 pounds (18 kg)

Links

Prices

515
Year Catalog price In 2026 dollars
 
515A
Year Catalog price In 2026 dollars
1959 $800 ~$9,200
 
RM15
Year Catalog price In 2026 dollars
1959 $875 ~$10,100

Internals

The HV power supply uses three 5642 rectifiers to produce +2,325 V for the CRT anode and −1,675 V for the CRT cathode. The LV power supply is linear, using a 6080 tube as the pass tube of the series regulator for +300 V and +100 V supply. The −150 V supply is regulated by a 6AU5 tube. The voltage reference for the −150 V supply is a 5651 tube.

The 515 and 515A use selenium rectifiers. A kit was later made available for converting them to silicon rectifiers for improved reliability. Starting at serial number 4424, the 515A used the 120-142 power transformer, the same part that is used in the 516.

The vertical amplifier is fully differential, DC-coupled, and all tube. The stages are as follows:

  • input buffer, cathode followers, 6AU6
  • first gain stage, differential amplifier, T-coil, 12BY7
  • unity gain buffer, cathode follower, 6DJ8
  • output amplifier, differential amplifier, T-coil, 6CL6

The horizontal amplifier uses half of a 6DJ8 as a buffer, followed by a 6DJ8 as a differential amplifier and phase splitter, followed by the two halves of another 6DJ8 as the output cathode followers driving the horizontal CRT deflection plates.

The trigger is a 6DJ8 differential trigger amplifier followed by a 6DJ8 Schmitt trigger.

Pictures

515

RM15


Components

Some Parts Used in the 515

Part Part Number(s) Class Description Used in
120-0080-00 120-0080-00 Discrete component power transformer 515
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 515 515A 516 524 525 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C CA G H K L ML M N K R S Z Keithley 610B Nelson-Ross PSA-021 Pentrix L20 Pentrix L30
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 180 180A 181 190 310 310A 315 315D 316 317 3C66 502 502A 507 511A 512 514 514D 514AD 515 515A 516 517 517A 524 526 531A RM31A 532 535 535A RM35A 536 544 546 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825 Keithley 660A Pentrix L20 Pentrix L30
12BY7A 154-047 154-0047-00 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 163 315 315D 515 515A 524 531 531A RM31A 533 535 535A RM35A 536 541 543 535 545 545A 549 555 75 3A75 3B5
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 315 315D 316 317 360 453 502 502A 503 504 506 513 515 515A 516 524 525 529 RM529 531A RM31A 532 533 533A 535 535A RM35A 536 543 543A 543B 544 545 545A 545B 546 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 180 180A 310 310A 315 315D 502 503 504 511A 512 515 515A 516 517 524 525 526 531 531A 532 535 535A RM35A 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
6080 154-0056-00 154-056 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 129 132 160 180A 315 315D 316 317 515 515A 516 525 531A RM31A 532 535 535A RM35A 535 536 541 541A 544 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 180 180A 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 514 514D 514AD 515 515A 516 517 517A 524 525 526 531A RM31A 532 535 535A RM35A 545 545A 549 551 565 570 581 581A 585 585A C CA T Telequipment D52 Telequipment D56 Telequipment S52
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 180A 310 310A 316 317 360 502 502A 515 515A 516 517 517A 526 532 565 570 575 N
6AQ5 154-017 154-0017-00 Vacuum Tube (Pentode) beam pentode 180 310 310A 315 315D 316 360 507 511A 512 515 515A 516 517 517A 524 525 532 536 570 575
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 515 515A 516 517 517A 531 531A RM31A 535 535A RM35A 535 541 544 546 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 129 160 180 180A 181 190 60 2A60 72 3A72 3C66 310 310A 315 315D 316 317 360 502 502A 506 511 511A 512 513 514 514D 514AD 515 515A 516 517 517A 524 526 529 RM529 531 531A RM31A 532 535 535A RM35A 536 544 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q Nelson-Ross PSA-021
6BQ7A 154-028 154-0028-00 157-0003-00 157-0022-00 Vacuum Tube (Dual Triode) dual triode 107 163 181 310 315 316 360 515 524 525 531 532 535 536 541 545 570 T
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 315 315D 316 317 515 515A 524 525 531 531A RM31A 532 535 535A RM35A 545 545A 545B 549 570 581 581A 585 585A 3A74
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 111 132 161 310A 316 317 502 502A 503 504 506 515 515A 516 519 526 529 RM529 531A RM31A 533 535 535A RM35A 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A2 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
6U8 154-0033-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 130 160 163 180 310 315 316 515 524 525 532 535 545 T
T0550 154-344 154-0344-00 CRT CRT 515 515A 516
T55 154-0344-00 CRT CRT 515 515A 516


Some Parts Used in the 515A

Part Part Number(s) Class Description Used in
120-142 120-142 Discrete component power transformer 515A 516
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 515 515A 516 524 525 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C CA G H K L ML M N K R S Z Keithley 610B Nelson-Ross PSA-021 Pentrix L20 Pentrix L30
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 180 180A 181 190 310 310A 315 315D 316 317 3C66 502 502A 507 511A 512 514 514D 514AD 515 515A 516 517 517A 524 526 531A RM31A 532 535 535A RM35A 536 544 546 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825 Keithley 660A Pentrix L20 Pentrix L30
12BY7A 154-047 154-0047-00 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 163 315 315D 515 515A 524 531 531A RM31A 533 535 535A RM35A 536 541 543 535 545 545A 549 555 75 3A75 3B5
154-0764-00 154-0764-00 154-0764-03 154-0764-04 CRT CRT 515A RM15 516
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 315 315D 316 317 360 453 502 502A 503 504 506 513 515 515A 516 524 525 529 RM529 531A RM31A 532 533 533A 535 535A RM35A 536 543 543A 543B 544 545 545A 545B 546 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 180 180A 310 310A 315 315D 502 503 504 511A 512 515 515A 516 517 524 525 526 531 531A 532 535 535A RM35A 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
6080 154-0056-00 154-056 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 129 132 160 180A 315 315D 316 317 515 515A 516 525 531A RM31A 532 535 535A RM35A 535 536 541 541A 544 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 180 180A 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 514 514D 514AD 515 515A 516 517 517A 524 525 526 531A RM31A 532 535 535A RM35A 545 545A 549 551 565 570 581 581A 585 585A C CA T Telequipment D52 Telequipment D56 Telequipment S52
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 180A 310 310A 316 317 360 502 502A 515 515A 516 517 517A 526 532 565 570 575 N
6AQ5 154-017 154-0017-00 Vacuum Tube (Pentode) beam pentode 180 310 310A 315 315D 316 360 507 511A 512 515 515A 516 517 517A 524 525 532 536 570 575
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 515 515A 516 517 517A 531 531A RM31A 535 535A RM35A 535 541 544 546 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 129 160 180 180A 181 190 60 2A60 72 3A72 3C66 310 310A 315 315D 316 317 360 502 502A 506 511 511A 512 513 514 514D 514AD 515 515A 516 517 517A 524 526 529 RM529 531 531A RM31A 532 535 535A RM35A 536 544 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q Nelson-Ross PSA-021
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 315 315D 316 317 515 515A 524 525 531 531A RM31A 532 535 535A RM35A 545 545A 545B 549 570 581 581A 585 585A 3A74
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 111 132 161 310A 316 317 502 502A 503 504 506 515 515A 516 519 526 529 RM529 531A RM31A 533 535 535A RM35A 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A2 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
T0550 154-344 154-0344-00 CRT CRT 515 515A 516
T55 154-0344-00 CRT CRT 515 515A 516