7623

The Tektronix 7623 is a 100 MHz analog multi-mode storage mainframe, introduced in 1973.
The 7623A facelift in 1975 increased standard writing speed to 150 div/µs (from 100 div/µs for a 7623 without option 12). Front panel controls were changed in the 7623A, too. The 7623B version, specified at 100 MHz, added a reduced scan mode to increase stored writing speed (essentially it was a re-named 7633). It replaced the 7613, 7623A and 7633 in 1991. There were also R7623(A,B) rack-mount versions.

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100 MHz multi-mode storage scope Tektronix 7623A, front view Produced from 1973 to 1992 Manuals Tektronix 7623 Manual (PDF) Tektronix 7623A Manual (PDF) Tektronix 7623A Military Service Manual (PDF) B model manuals needed Modifications 7xx3 pushbutton illumination mod 050-0876-10 (1977): CRT replacement (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Key Specifications

	— Common —
Fastest cal. sweep	5 ns/Div
Bandwidth	100 MHz with 7A11, 7A16, 7A17 and similar amplifiers; 75 MHz with 7A13, 7A18
Calibrator	40 mV, 400 mV or 4V into 1 MΩ, 1 kHz
Storage modes	variable persistence, fast variable persistence, bistable, fast bistable, non-store
Weight	13.6 kg (30 lb)
Power	170/180 W
Options	Option 01 - No Readout Option 03 - EMI modification Option 05 - Line frequency change (50-400 Hz), only for R7623 Option 07 - No signals out board Option 12 - Fast Writing CRT (200 cm/µs, 220 Div/µs)
	— 7623 —
Stored writing speed	fast var persist - 100 Div/μs, var persist - 0.5 Div/μs, bistable - 0.03 Div/μs
CRT	T7410 (154-0659-00), 8 x 10 Div. @ 0.9 cm, P31 phosphor, 8.5 (+7/-1.5) kV acceleration
	— 7623A —
Stored writing speed	fast var persist - 150 Div/μs, fast bistable - 50 Div/μs, var persist - 0.5 Div/μs, bistable - 0.03 Div/μs
CRT	T7411 (154-0723-00), 8 x 10 Div. @ 0.9 cm, P31 phosphor, 8.5 (+7/-1.5) kV acceleration
	— 7623B —
Bandwidth	tba
Stored writing speed	1000 cm/μs (in reduced-scan mode)

Internals

The 7623 uses a Transfer storage CRT which includes an internal, fast-responding storage mesh. In fast mode, the time base is inhibited after a sweep, and the transfer cycle is started. Individual sweeps therefore occur in about one-second intervals.

The vertical output amplifier is built around a 155-0080-00 hybrid in the non-A version. The 7623A vertical amplifier is a discrete design with bridged T-coils. Other custom Tek ICs used in the 7623 include 155-0011-00 clock & chop blanking, 155-0022-00 channel switch, and the 7000 series readout system chips.

Links

Three kinds of Storage, in Tekscope, July 1972 or @ radiomuseum.org
Tek 7623A @ barrytech.com / Tek 7623B @ barrytech.com
Tek 7623 @ radiomuseum.org
Catalog page with specs

Prices

Year	1973	1974	1976	1980	1984	1990	1991
Model	7623	7623A	7623A	7623A	7623A	7623A	7623B
Catalog price	$2,850	$3,000	$3,500	$4,295	$6,310	$8,900	$12,350
2015 value	$15,070	$14,280	$14,440	$12,230	$14,260	$15,980	$21,280

Pictures

7623
7623A
7623A
7623A trace
7623A rear connections
7623A right internal
7623B
left side, X and Y output amplifiers
right side, storage logic board