7623
The Tektronix 7623 is a 100 MHz analog multi-mode storage mainframe, introduced in 1972.
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.
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 |
|
| — 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.
The 7623, like the other 76xx models, has a linear supply which does not provide +5 V for lights (A9) without modification.
Links
- Three kinds of Storage, in Tekscope, July 1972 or @ radiomuseum.org
- 7623A @ amplifier.cd
- 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
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7623
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7623A
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7623A
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7623A trace
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7623A rear connections
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7623A right internal
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7623B
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left side, X and Y output amplifiers
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right side, storage logic board
