7504

Manuals – Specifications – Links – Pictures

The Tektronix 7504 is a 90 MHz 7000-series mainframe, one of the initial oscilloscopes introducing the 7000-Line in 1969.

It is very lavishly built, using contacts embedded in the aluminium frame for interconnecting the gold plated circuit boards. It also features the 7000-series remote control connector on the rear panel.

It can take two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins., and was in production for about one year.

Key Specifications

Bandwidth	90 MHz
Fastest calibrated sweep	5 ns/Div
Calibrator	DC, square wave (1 kHz or ½ B Sweep gate), 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA current loop
Vertical modes	Left / Alt / Add / Chop / Right
Horizontal modes	A / Alt / Chop / B
Trigger Source	Left / Vert Mode / Right
Inputs	Z Axis High Speed (60 Vp-p, DC−75 MHz) Z Axis High Sensitivity (2 Vp-p, DC−2 MHz; 0.4 Vp-p @ 10 MHz)
Outputs	Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ) +Sawtooth +Gate camera power probe power
CRT	8x10 Div @ 1 cm/Div internal gradicule, 154-0608-00 with P31 phosphor 18 kV acceleration (+15/-2.96)
Options	Opt.01 – without readout Opt.02 – X-Y compensation network Opt.03 – EMI shielding
Power	90−136 V or 180−272 V, 48−440 Hz, 280 W max.
Weight	24.6 kg (54 lb)
Size	34.2 cm × 30.5 cm × 62.2 cm (H×W×L) (13.5 in x 12.0 in x 24.6 in)

Internals

Like other 75xx and 76xx mainframes, the 7504 has a linear power supply, as opposed to the switchmode supplies used in the later 4-slot mainframes.

It is equipped with a rear remote control connector similar to the 7904 but lacking the remote readout features, and two probe power connectors.

Logic, channel switching, and readout use the classic TEK 7000 series custom ICs (155-0009-00 to 155-0022-00), the vertical amplifier (also designed by Andrews) and the horizontal amplifier are completely discrete.

The 7504 does not implement the Aux Y input (B16), therefore the Trace Separation control on a 7B92/7B92A will have no effect.

The 7504 contains a mercury-based elapsed time meter on the low voltage regulator board.

Links

• Troubleshooting a 7504 @ KC0WOX / Detailed internal pictures
• Tektronix 7504 @ barrytech.com

Pictures

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Components

Some Parts Used in the 7504

Custom ICs used in the 7000 series readout system

Page	Model	Part nos	Description	Designers	Used in
155-0014-01	M019D	155-0014-00 • 155-0014-01	analog-to-decimal converter	Barrie Gilbert	7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001
155-0015-01	M020F	155-0015-00 • 155-0015-01	analog data switch	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0017-00	M025	155-0017-00	5 MHz decade counter	Barrie Gilbert	7000 series readout system • 7854 • 7934
155-0018-00	M026	155-0018-00	zeros logic control	Les Larson	7000 series readout system • 7934
155-0019-00	M027	155-0019-00	decimal point and spacing control	Les Larson	7000 series readout system
155-0020-00	M028	155-0020-00	output assembler	Les Larson	7000 series readout system
155-0021-00	M029C	155-0021-00 • 155-0021-01	timing generator	Les Larson	7000 series readout system • 7854 • 7934
155-0023-00	M160	155-0023-00	character generator (0 1 2 3 4 5 6 7 8 9)	Barrie Gilbert	7000 series readout system
155-0024-00	M161	155-0024-00	character generator (↓ < I / + - + C Δ >)	Barrie Gilbert	7000 series readout system
155-0025-00	M162	155-0025-00	character generator (m μ n p X K M G T R)	Barrie Gilbert	7000 series readout system
155-0026-00	M163	155-0026-00	character generator (S V A W H d B c Ω E)	Barrie Gilbert	7000 series readout system
155-0027-00	M164	155-0027-00	character generator (U N L Z Y P F J Q D)	Barrie Gilbert	7000 series readout system