Monthly Archives: January 2020
Schematic and parts list of the Hammond Preamp AO-28 (B3, C3)
Schematic of Hammond Preamp AO-28
AO-28 Capacitors
| Amount | Capacity | Type | Voltage | Schematic Nr. | Mouser Part Nr. |
|---|---|---|---|---|---|
| 1 | 25/25V | Electrolytic | 25V | C30 | 75-TVA1205 |
| 2 | 30/25V | Electrolytic | 25V | C9, C26 | 75-TVA1412 |
| 1 | 10/350V | Electrolytic | 350V | C59 | 75-TVA1705 |
| 1 | 30/350V | Electrolytic | 350V | C58 | 75-TVA1907 |
| 1 | 40/400V | Electrolytic | 400V | C57 | 75-TVA1712 |
| 1 | 40/450V | Electrolytic | 450V | C56 | 75-TVA1712 |
| 1 | 50/300V | Electrolytic | 300V | C60 | 75-TVA1713 |
| 3 | 100PF | ceramic | 500V | C3,C8,C29 | 5982-15-500V100 |
| 1 | 150PF | ceramic | 500V | C35 | 5982-10-500V150 |
| 2 | 220PF | ceramic | 500V | C18, C20 | 5982-10-500V220 |
| 1 | 24PF | ceramic | 500V | C7 | 5982-10-500V24 |
| 1 | 30PF | ceramic | 500V | C6 | 5982-15-500V30 |
| 1 | 390PF | ceramic | 500V | C32**, C35* | 5982-15-500V390 |
| 1 | 39PF | ceramic | 500V | C2 | 5982-15-500V39 |
| 1 | 51PF | ceramic | 500V | C15 | 5982-15-500V50 |
| 1 | 680PF | ceramic | 500V | C17 | 5982-19-500V680 |
| 1 | 82PF | ceramic | 500V | C24 | 5982-15-500V82 |
| 1 | 0.0015uF | ceramic | 500V | C34 | 75-715P600V0.0015 |
| 3 | 0.001uF | ceramic | 500V | C25,C21,C34 | 75-715P600V0.001 |
| 2 | 0.0022uF | ceramic | 500V | C19,C33* | 75-715P600V0.0022 |
| 1 | 0.0033uF | ceramic | 500V | C33** | 75-715P600V0.0033 |
| 2 | 0.0047uF | FILM | 100V | C11, C12 | 75-715P600V0.0047 |
| 1 | 0.0082uF | FILM | 1000V | C32 | 75-5GAD82 |
| 1 | 0.01uF | FILM | 200V | C5 | 75-715P200V0.01 |
| 2 | 0.033uF | FILM | 400V | C23,C16 | 75-715P400V0.033 |
| 1 | 0.047uF | FILM | 400V | C28 | 75-715P400V0.047 |
| 3 | 0.33uF | FILM | 200V | C4,C10,C31 | 75-715P200V0.33 |
| 1 | 1.0uF | FILM | 200V | C13 | 75-710P105X9400 |
AO-28 Resistors
| Amount | Resistance | Wattage | Type | Subtype | Schematic Nr. | Mouser part Nr. |
|---|---|---|---|---|---|---|
| 6 | 47K | 0.5W | Metal | Film | R6,R16,R47,R52*,R53*,R54* | 273-47K-RC |
| 2 | 1.2K | 0.5W | Carbon | Comp. | R42,R17 | 30BJ500-1.2K |
| 1 | 1.5M | 0.5W | Carbon | Comp. | R57 | 30BJ500-1.5M |
| 4 | 1.8M | 0.5W | Carbon | Film | R30,R32,R27,R4 | 293-1.8M-RC |
| 2 | 100K | 0.5W | Metal | Film | R41,R62** | 273-100K-RC |
| 1 | 100 Ohms | 0.5W | Carbon | Comp. | R25 | 30BJ500-100 |
| 3 | 10M | 0.25W | Carbon | Film | R5,R14,R18 | 291-10M-RC |
| 1 | 15M | 0.25W | Carbon | Film | R34 | 291-15M-RC |
| 1 | 1M | 0.5W | Metal | Film | R21 | 273-1.0M-RC |
| 1 | 2.2K | 0.5W | Carbon | Comp. | R49 | 30BJ500-2.2K |
| 2 | 2.2M | 0.5W | Carbon | Comp. | R7,R20 | 30BJ500-2.2M |
| 1 | 2.7M | 0.5W | Carbon | Film | R15 | 293-2.7M-RC |
| 1 | 220K | 0.5W | Metal | Film | R62 | 273-220K |
| 1 | 22K | 0.5W | Carbon | Comp. | R56 | 30BJ500-22K |
| 1 | 22 Ohms | 0.5W | Carbon | Comp. | R50 | 30BJ500-22 |
| 3 | 270K | 0.5W | Metal | Film | R37,R3,R12 | 273-270K-RC |
| 1 | 3.3M | 0.5W | Carbon | Film | R35 | 293-3.3M-RC |
| 1 | 3.9M was 6.8M | 0.5W | Carbon | Film | R10 | 293-6.8M-RC |
| 2 | 330K | 0.5W | Carbon | Comp. | R36,R29 | 30BJ500-330K |
| 1 | 330K | 0.5W | Metal | Film | R39 | 273-330K-RC |
| 2 | 390K | 0.5W | Metal | Film | R38,R63 | 273-390K-RC |
| 1 | 39K | 0.5W | Metal | Film | R61 | 273-39K-RC |
| 1 | 4.7K | 0.5W | Carbon | Comp. | R51 | 30BJ500-4.7K |
| 1 | 4.7M | 0.5W | Carbon | Film | R13 | 293-4.7M-RC |
| 1 | 4.7M | 0.5W | Carbon | Comp. | R58 | 30BJ500-4.7M |
| 2 | 470K | 0.5W | Carbon | Comp. | R8,R19 | 30BJ500-470K |
| 1 | 470K | 0.5W | Metal | Film | R48 | 273-470K-RC |
| 6 | 47K | 0.5W | Metal | Film | R6,R16,R47,R52*,R53*,R54* | 273-47K-RC |
| 2 | 68K | 0.5W | Metal | Film | R31, R33 | 273-68K-RC |
| 1 | 820K | 0.5W | Metal | Film | R9 | 273-820K-RC |
| 1 | 820 Ohms | 0.5W | Carbon | Comp. | R22 | 30BJ500-820 |
| 1 | 82K | 0.5W | Carbon | Comp. | R55 | 30BJ500-82K |
| 2 | 22K | 1W | Ceramic | Comp. | R23, R24 | 588-OX-22K |
| 1 | 180 Ohms | 5W | Cement | R99 | 280-CR5-180 | |
| 2 | 2.7K | 5W | Cement | R100, R101 | 280-CR5-2.7K | |
| 3 | 4700 Ohms | 5W | Cement | R94, R95, R96 | 280-CR5-4.7K | |
| 1 | 900 Ohms | 10W | Cement | R91 | 280-CR10-910 | |
| 1 | 7500 Ohms | 10W | Cement | R98 | 280-CR10-5.0K |
* These components are for AO-28-1 amplifiers with no code letter only
** These components are for H-AO-28-5 amplifiers