515

From TekWiki
Jump to navigation Jump to search
Tektronix 515
15 MHz Tube scope
Tektronix 515 front

Produced from 1955 to (?)

Manuals
(All manuals in PDF format unless noted otherwise)
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.

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, 6 cm linear vertical deflection
Input impedance 1 MΩ // 30 pF
Power consumption 275 W
Weight 40 pounds (18 kg)

Links

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

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
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 316 317 360 453 502 502A 503 504 506 513 515 516 524 529 RM529 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 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 W Z 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


Some Parts Used in the 515A

Part Part Number(s) Class Description Used in
120-142 120-142 Discrete component power transformer 515A 516
T0550 154-344 154-0344-00 CRT CRT 515 515A 516
T55 154-0344-00 CRT CRT 515 515A 516