R7903

Tektronix R7903
500 MHz non-storage mainframe Tektronix R7903 Produced from 1974 to 1982 Manuals R7903 Operator Manual R7903 Service Manual (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix R7903 is a rackmount version of the 7903, a 3-slot 7904 that takes only one horizontal plug-in. Otherwise, aside from being rackmount shape, it the same as a 7904.

Key Specifications

Bandwidth	500 MHz
Fastest calibrated sweep	500 ps/Div (with 7B92A, other time bases "uncalibrated for first 60 ns")
Acceleration voltage	24 kV

Links

Anchorite Nevada Instrumentation Trailer with over 100 R7903s (photo and article @ vintagetek.org)

Internals

Early R7903 (SN B159999 and earlier) have issues with horizontal aberrations for sweep rates of 1 ns/Div or faster. After discovery of the issue modification kits (040-0801-00) that replace the horizontal amplifier were offered. For more information see the manual of the 067-0657-00 Normalized Ramp Generator that was use to investigate this issue.

Pictures

Option 4: brighter, smaller scan CRT
Option 4: brighter, smaller scan CRT
R7903 rear
R7903 Option 4 trace

Components

Some Parts Used in the R7903

Part	Part Number(s)	Class	Description	Used in
154-0644-00	154-0644-00 • 154-0644-04 • 154-0644-05 • 154-0644-09 • 154-0893-05	CRT	CRT with distributed deflection plates	7704A • 7854 • 7904 • 7904A • R7903
155-0009-00	155-0009-00	Monolithic integrated circuit	horizontal lockout logic	7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0010-00	155-0010-00	Monolithic integrated circuit	chop divider and blanking	7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0011-00	155-0011-00	Monolithic integrated circuit	clock and chop blanking	485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00	155-0012-00	Monolithic integrated circuit	Z Axis Logic	485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0013-00	155-0013-00 • 155-0013-01	Monolithic integrated circuit	horizontal chop and alt. binary	7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104
155-0022-00	155-0022-00 • 155-0022-01	Monolithic integrated circuit	analog multiplexer	147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
155-0059-00	155-0059-00	Monolithic integrated circuit	HF amplifier	7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD
155-0060-00	155-0060-00 • 155-0060-01	Monolithic integrated circuit	channel selector amplifier	R7903 • 7904 • R7912
155-0064-00	155-0064-00	Hybrid integrated circuit	vertical output amplifier	7834 • 7854 • 7904 • R7903 • 7912AD • 485 • PG502
155-0065-00	155-0065-00 • 155-0064-01 • 155-0125-00	Hybrid integrated circuit	deflection amplifier	7844 • 7904 • R7912 • R7903
155-0067-02	155-0067-00 • 155-0067-02 • 155-0067-03	Monolithic integrated circuit	SMPS controller	7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
155-0078-00	155-0078-xx • 155-0273-00 • 155-0274-00	Monolithic integrated circuit	broadband amplifier	464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
155-0095-00	155-0095-00 • 155-0095-01 • 155-0095-03	Hybrid integrated circuit	HF differential amplifier	7834 • 7844 • 7904 • R7903 • R7912 • 7912AD
203-0126-90	203-0126-90	Monolithic integrated circuit	ft doubler amplifier	R7903 • 7904 • 7844

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