M402B — Effects Equalizer
| Type | module |
| Category | FILTERS |
| Try it | simulator & front panel · download package (zip) |
| Earliest dated evidence | 1970|3 — title-block date |
| Evidence | "DATE JAN 70" in PUBLIC/Manuals + tech DOCUMENTS/Modules/M402 - Equalizer/m402b-docs-10.gif |
| Confidence | high |
| All years found | 1970|3, 1971|4 |
| Variants | M402, M402A |
| Folder | DOCUMENTS/wbsPS-NOT UPLOADED |
| Folder | Modules/AMPLIFIERS/M600 |
| Folder | Modules/AMPLIFIERS/M604 |
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: 9 named (9 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 — 9 contacts
| Pin | Signal | Kind | Confidence | Read from | Source |
|---|---|---|---|---|---|
| 5 | EQ IN LEFT also: EQ IN RIGHT (rto-144) | audio in | high | rto-144 | M402B.rto144.json, p. 1 |
| 6 | EQ IN RIGHT | audio in | high | rto-144 | M402B.rto144.json, p. 1 |
| 8 | EQ IN LEFT | audio in | high | rto-144 | M402B.rto144.json, p. 1 |
| 13 | EQ OUT LEFT also: EQ OUT RIGHT (rto-144) | audio out | high | rto-144 | M402B.rto144.json, p. 1 |
| 14 | EQ OUT LEFT also: EQ OUT RIGHT (rto-144) | audio out | high | rto-144 | M402B.rto144.json, p. 1 |
| 18 | COMMON | ground / common | high | rto-144 | M402B.rto144.json, p. 1 |
| 19 | COMMON | ground / common | high | rto-144 | M402B.rto144.json, p. 1 |
| 20 | +24 V | power rail | high | rto-144 | M402B.rto144.json, p. 1 |
| 22 | +48 V | power rail | high | rto-144 | M402B.rto144.json, p. 1 |
Pictures
1975 - M402B - PRICE LIST - PRICE LIST.jpg
1970 - M402B - 402-02-012 - WAAD-BECK BYBTEMB LTO ISSMOCKD.gif
1971 - M402B - B 1-139-06-001 - M402B EQUALIZER MODULE PCB - COMPONENT LAYOUT.gif
m402b-docs-9.gif
1970 - M402B - 1-139-02-001.jpg
1970 - M402B - 139-06-001 - MIM'BEND RAD UNLESS SPECIFED.jpg
1970 - M402B - 402-02-013.jpg
1970 - M402B - 402-09-001 - TIR' MINBEND RAD UNLESS SPECIFIED.jpg
1970 - M402B - 404-09-002 - BEND RAD UNLESS SPECIFIED.jpg
1970 - M402B - B 402-04-005 - M402B - EQUALIZER MODULE - LAYOUT.gif
1970 - M402B - P1.jpg
1970 - M402B - P10.jpg
1970 - M402B - P11.jpg
1970 - M402B - P12.jpg
1970 - M402B - P13.jpg
1970 - M402B - P2.jpg
1970 - M402B - P3.jpg
1970 - M402B - P4.jpg
1970 - M402B - P5.jpg
1970 - M402B - P6.jpg
1970 - M402B - P7.jpg
1970 - M402B - P8.jpg
1970 - M402B - P9.jpg
1970 - M402B - docs-1.gif
1970 - M402B - docs-11.gif
1970 - M402B - docs-2.gif
1970 - M402B - docs-3.gif
1970 - M402B - docs-4.gif
1970 - M402B - docs-5.gif
1970 - M402B - docs-6.gif
1970 - M402B - docs-7.gif
1970 - M402B - file.jpg
1970 - M402B - wbsps - module - M402b equalizer 003.jpg
1970 - M402B - wbsps - module - m402b equalizer 001.jpg
1970 - M402B - wbsps - module - m402b equalizer 001_small.jpg
1970 - M402B - wbsps - module - m402b equalizer 002.jpg
1970 - M402B - wbsps - module - m402b equalizer 002_small.jpg
1970 - M402B - wbsps - module - m402b equalizer 003_small.jpg
1971 - 1-139-02-001 - EQUALIZER MODULE PCB SCHEMATIC - DRN PHL - ISS 4.jpg
1971 - 1-139-06-001 - EQUALIZER MODULE PCB COMPONENT LAYOUT - DRN PHL - ISS 2.jpg
m402b-docs-10.gif
m402b-docs-8.gif
19xx - M402A - M402B.jpg
Ward Beck Systems M402A 4.jpg
IMG_2008.jpg
1968 - M402A - Ward Beck Systems M402A 1.jpg
1968 - M402A - Ward Beck Systems M402A 2.jpg
1968 - M402A - Ward Beck Systems M402A 4.jpg
1971 - 1-139-02-001 - EQUALIZER MODULE PCB SCHEMATIC - DRN PHL - ISS 10.gif
1971 - 1-139-06-001 - EQUALIZER MODULE PCB COMPONENT LAYOUT - DRN PAHL - ISS 3.gifPrice history
| Year | Kind | Price | Listed as | Effective | Source |
|---|---|---|---|---|---|
| 1975|8 | list price | 415.00 USD | Effects Equalizer | May 1975 | source |
Dates found in the documents
Physical manual inventory
| Item | Location | Status | Scanned |
|---|---|---|---|
| M402B | DUPLICATE | Recently scanned and stiched by WB | |
| M402B - Equalizer | PDF - Already scanned |
Documents (2)
| Year | File | |
|---|---|---|
| 1970|3 | 1970 - M402B - Equalizer (2).pdf | note |
| 1970|3 | 1970 - M402B - Equalizer.pdf | note |
Photos & scans (66)
Sub-assemblies & parts used (1)
| Item | What | Family | Year | How we know |
|---|---|---|---|---|
| 60-7 | 60-7 / INPUT TRANSFORMER | Input transformers (60-n) | 1968|1 | named in its manual |
Named in other drawings & documents (7)
Drawings (20)
Each scan with its trace laid over it: the slider runs from the scan to the vector drawing. Click one to see it large and save it as SVG, DXF, KiCad, PDF or PowerPoint.
1970 - M402B - 1-139-02-001viewer
Waad-Beck Bybtemb Lto Issmockdviewer
1970 - M402B - 402-02-013viewer
M402B / EQUALIZER MODULE / PCB SCHEMATICviewer
M402B / EQUALIZER MODULE / PCB SCHEMATICviewer
Mim'Bend Rad Unless Specifedviewer
M402B EQUALIZER MODULE PCB / COMPONENT LAYOUTviewer
M402B / EQUALIZER MODULE PCB / COMPONENT LAYOUTviewer
1970 - M402B - 402-09-001 - TIR' MINBEND RAD UNLESS SPECIFIEDviewer
Bend Rad Unless Specifiedviewer
Read from the drawing title blocks.
| Drawing | Title | Date | Drawn by | Checked by | Iss. | Source |
|---|---|---|---|---|---|---|
| 402-02-012 | Water Pipe | 1970|3 | 5 | file p.10 | ||
| 402-02-012 | Water Pipe | 1970|3 | 5 | file p.10 | ||
| 402-02-012 | Waad-Beck Bybtemb Lto Issmockd | 1970|3 | 5 | file | ||
| — | Oir Eemd Rad Uless | 1971|4 | 3 | file p.9 | ||
| — | Oir Eemd Rad Uless | 1971|4 | 3 | file p.9 | ||
| B 1-139-02-001 | M402B / EQUALIZER MODULE / PCB SCHEMATIC | 1971|4 | PHL | 4 | file | |
| B 1-139-02-001 | M402B / EQUALIZER MODULE / PCB SCHEMATIC | 1971|4 | PHL | 10 | file | |
| B 1-139-06-001 | M402B / EQUALIZER MODULE PCB / COMPONENT LAYOUT | 1971|4 | PHL | 2 | file | |
| B 1-139-06-001 | M402B EQUALIZER MODULE PCB / COMPONENT LAYOUT | 1971|4 | 3 | file | ||
| — | Equalizer Module Layout Scne | PLL | file p.8 | |||
| — | Equalizer Module Layour Scne | PLL | file p.8 | |||
| — | file | |||||
| — | file | |||||
| — | file | |||||
| 1-129-02-001 | Cia Cib Cie Csi Icie | PAL | file p.12 | |||
| 1-129-02-001 | Cia Cib Cie Csi Icie | PAL | file p.12 | |||
| 1-139-02-001 | file | |||||
| 139-06-001 | Mim'Bend Rad Unless Specifed | file | ||||
| 402-02-013 | file | |||||
| 404-09-002 | Bend Rad Unless Specified | file |