545

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The Tektronix Type 545 is a 30 (33) MHz scope that takes letter-series and 1-series plug-ins. It has two timebases, which allows delayed triggering.

Type 545 was introduced February 7th, 1955 along with Type 541, and superseded in 1959 by Type 545A, which was in turn superseded in 1964 by Type 545B, which was produced until 1973. Type 543, which is a 541 with 100x sweep magnifier, was introduced in 1958.

The difference between the 545A and 545 is the control ergonomics, not any major circuit design changes. The main improvement was to replace a pair of switches for the time base (8-position Time/Div and 6-position multiplier) with a single 24-position switch, freeing up front panel space for a Time Base B Trigger Mode rotary switch. Additionally, the delaying timebase on the 545A supports delays up to 10 seconds while the 545 supports delays only up to 100 milliseconds.

The older 545 uses the T54 / 5BHP2 CRT, P2 phosphor was standard. The 545A uses the T5430 CRT for which also P2 phosphor was standard. The newer 545B came with the further improved T5470 CRT (also used in the 543B, 544, 546 and 547) and P31 phosphor as standard.

Versions

There were also rack-mount versions. Types RM41 and RM45 were introduced in October 1957, Types RM41A and RM45A were introduced in May 1959 simultaneously with their bench counterparts, and the rackmount Type RM545B or R545B was introduced at the same time as Type 545B.

Clones of the 545A are the Lavoie LA-265A and Hickok 1805A. These clones were not licensed by Tektronix.

Relationship of 545B to 547

Some feel that Type 547 replaced Type 545, but this is not quite true; Types 545B and 546/547 were introduced simultaneously (1964). It is more correct to say that the 50 MHz 546 and 547 were upgrades. (Type 544 is likewise the upgrade for 541/543.)

The Type 53K/54K plug-in was introduced with the 545 and 541, and until Type 53/54L came out in 1957, it was the only plug-in that could take full advantage of their bandwidth. There was never a full-speed dual-trace plug-in — that would wait until Types 1A1 and 1A2, which came out with the 545B.

Specifications

Bandwidth 30 MHz (33 MHz with a 50 MHz plug-in such as Type 1A1)
     — 545B
Sweep 0.1 μs/div to 5 s/div, 1−2−5
CRT T5470-31-2, 10 kV acceleration
Probes 2 P6006 probes with BNC connectors

please add

Internals

Early 545 units have selenium rectifiers. Later units have silicon rectifiers.

The trigger circuit used a 6DJ8 tube in the 545 and 545A. NPN transistors are used in the 545B trigger circuit.

545 and 545A Vertical Path

Types 545 and 545A have a six stage differential distributed vertical amplifier made of twelve 6DK6 tubes. The vertical amplifier used in the 545A is also used in the 551 and 555. The 545 uses the 154-098 CRT. With the limited CRT technology available at the time, the higher bandwidth of the 541 and 545 came with a tradeoff. The vertical scale is only 4 divisions, 2 above and 2 below the graticule center line. The lower bandwidth 531/533/535 retained the 6 vertical divisions, as used in most other Tektronix scopes. Shorting the outputs of the vertical amplifier to ground can cause expensive damage by burning out the termination resistor network. Starting at Type 545A serial number 29960, there is a 150 mA fuse, F1054, to prevent that failure. This change was made available for instruments already built, in Modification Kit 040-227.

545B Vertical Path

Type 545B differs significantly from the 545 and 545A. It was designed by Dave Barton. It has a partly solid-state, non-distributed vertical amp, and uses the 154-0478-00 CRT which is also used in the 544, 546, and 547. Improvements in CRT design, including reduced deflection plate capacitance and increased sensitivity, increased the vertical scale in the 545B from 4 to 6 divisions. The improved CRT also uses a ceramic envelope, with a flat glass faceplate with internal graticule markings to eliminate parallax errors.

Links

Pictures

545

545A

RM45A

545B

RM545B


Some Parts used in the 545

Page Class Description Used in
12AL5 Vacuum Tube (Double Diode) high-perveance dual diode 545 545A 549
12AU6 Vacuum Tube (Pentode) RF pentode 112 512 556 575 545 549 581 585 C G K H L M Z
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
12BY7 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 531 533 535 536 541 543 535 545 545A 549 555
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
5BHP CRT 5" CRT 541 545
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6AU5 Vacuum Tube (Pentode) 10 W beam power pentode 513 531 535 541 535 545 581 581A 585 585A
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA
6AW8 Vacuum Tube (Triode/Pentode) triode-pentode combo 132 541 535 545
6BQ7A Vacuum Tube (Double Triode) dual triode 107 181 315 524 531 532 535 541 545
6CB6 Vacuum Tube (Pentode) pentode 105 112 513 517 541 535 545
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
6DK6 Vacuum Tube (Pentode) high-frequency miniature pentode 180 503 513 514 541 543 535 545 545A 551 555
6U8 Vacuum Tube (Triode/Pentode) triode-pentode combo 130 535 545
T54 CRT CRT 541 545


Some Parts used in the RM45

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Some Parts used in the 545A

Page Class Description Used in
12AL5 Vacuum Tube (Double Diode) high-perveance dual diode 545 545A 549
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
12BY7 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 531 533 535 536 541 543 535 545 545A 549 555
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
6DK6 Vacuum Tube (Pentode) high-frequency miniature pentode 180 503 513 514 541 543 535 545 545A 551 555
8426 Vacuum Tube (Pentode) RF pentode O 545A 549 581A 585A
T5430 CRT 5" CRT 541A 543 543A 545A


Some Parts used in the 545B

Page Class Description Used in
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
7119 Vacuum Tube (Dual Triode) dual triode 067-0532-00 191 3A3 3B4 3B5 516 545B 549 661
T5470 CRT 5" electrostatic deflection CRT 543B 544 545B 546 547


Some Parts used in the RM545B

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