M490B
| Type | module |
| Category | INPUT-PRE-AMPS |
| Try it | simulator & front panel |
| Earliest dated evidence | 1978|11 — estimate from a dated variant |
| Evidence | from M490 |
| Confidence | family |
| Used in jobs | 900438 (1990|23), R1400-R2400-sales |
| Variants | M490, M490A, M490C, M490D, M490E, M490F, M490G, M490H, M490J, M490K, M490L, M490M, M490N, M490T |
| Folder | Modules/INPUT-PRE-AMPS/M490B |
Connections and circuit (ideal SPICE model)
Drawn live from its RTO-144 connections: run the generator, turn the gain, watch the VU. Open the netlist to see how the model is built.
Pinout & connections
Each contact as its own documents name it: 15 named (15 high confidence). An empty slot is a contact no page names. Hover a contact for its source; the table under the drawing lists them.
pinout (SVG) · connections (SVG) · pins (JSON)
Pin evidence — 15 contacts
| Pin | Signal | Kind | Confidence | Read from | Source |
|---|---|---|---|---|---|
| P1-1 | LEFT PGRM 1 | audio bus / pair | high | rto-144 | M490B.rto144.json, p. 1 |
| P1-2 | LEFT PGRM 1 | audio bus / pair | high | rto-144 | M490B.rto144.json, p. 1 |
| P1-3 | RIGHT PGRM 1 | audio bus / pair | high | rto-144 | M490B.rto144.json, p. 1 |
| P1-4 | RIGHT PGRM 1 | audio bus / pair | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-A | MIC IN A | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-1 | MIC IN A | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-C | MIC IN B | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-3 | MIC IN B | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-F | INSERT SEND | audio out | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-6 | INSERT SEND | audio out | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-H | INSERT RETURN | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-7 | INSERT RETURN | audio in | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-19 | -25 V | power rail | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-20 | COMMON also: COMMON (rto-144) | ground / common | high | rto-144 | M490B.rto144.json, p. 1 |
| P2-21 | +25 V | power rail | high | rto-144 | M490B.rto144.json, p. 1 |
Pictures
1978 - M490B - 001.jpg
1978 - M490B - 002.jpg
1990 - 900438 - 900438-01-001 - STEREQ LINE INPUL MODULES CUE STEREQ LINE INPUI.jpg
1990 - R1400 - R2400 - 010.jpgPhysical manual inventory
| Item | Location | Status | Scanned |
|---|---|---|---|
| M490B - Mic Pre-amp - User Guide | SCANNED BUT NEEDS STICHING | ||
| M490B - Mic Pre-amp #User Guide | Recently scanned and stiched by WB |
Photos & scans (2)
| Year | File | |
|---|---|---|
| 1978|11 | 1978 - M490B - 001.jpg | note |
| 1978|11 | 1978 - M490B - 002.jpg | note |
Consoles & jobs it is connected to (2)
Their own drawings name this module.
| Job | Year | Drawing | Page |
|---|---|---|---|
| 900438 | 1990|23 | 1990 - 900438 - 900438-01-001 - STEREQ LINE INPUL MODULES CUE STEREQ LINE INPUI.jpg | 1 |
| R1400-R2400-sales | 1990 - R1400 - R2400 - 010.jpg | 1 |