Schematic and parts list of the Hammond Preamp AO-28 (B3, C3)

Schematic of Hammond Preamp AO-28

AO-28 Capacitors

AmountCapacityTypeVoltageSchematic Nr.Mouser Part Nr.
125/25VElectrolytic25VC3075-TVA1205
230/25VElectrolytic25VC9, C2675-TVA1412
110/350VElectrolytic350VC5975-TVA1705
130/350VElectrolytic350VC5875-TVA1907
140/400VElectrolytic400VC5775-TVA1712
140/450VElectrolytic450VC5675-TVA1712
150/300VElectrolytic300VC6075-TVA1713
3100PFceramic500VC3,C8,C295982-15-500V100
1150PFceramic500VC355982-10-500V150
2220PFceramic500VC18, C205982-10-500V220
124PFceramic500VC75982-10-500V24
130PFceramic500VC65982-15-500V30
1390PFceramic500VC32**, C35*5982-15-500V390
139PFceramic500VC25982-15-500V39
151PFceramic500VC155982-15-500V50
1680PFceramic500VC175982-19-500V680
182PFceramic500VC245982-15-500V82
10.0015uFceramic500VC3475-715P600V0.0015
30.001uFceramic500VC25,C21,C3475-715P600V0.001
20.0022uFceramic500VC19,C33*75-715P600V0.0022
10.0033uFceramic500VC33**75-715P600V0.0033
20.0047uFFILM100VC11, C1275-715P600V0.0047
10.0082uFFILM1000VC3275-5GAD82
10.01uFFILM200VC575-715P200V0.01
20.033uFFILM400VC23,C1675-715P400V0.033
10.047uFFILM400VC2875-715P400V0.047
30.33uFFILM200VC4,C10,C3175-715P200V0.33
11.0uFFILM200VC1375-710P105X9400

AO-28 Resistors

AmountResistanceWattageTypeSubtypeSchematic Nr.Mouser part Nr.
647K0.5WMetalFilmR6,R16,R47,R52*,R53*,R54*273-47K-RC
21.2K0.5WCarbonComp.R42,R1730BJ500-1.2K
11.5M0.5WCarbonComp.R5730BJ500-1.5M
41.8M0.5WCarbonFilmR30,R32,R27,R4293-1.8M-RC
2100K0.5WMetalFilmR41,R62**273-100K-RC
1100 Ohms0.5WCarbonComp.R2530BJ500-100
310M0.25WCarbonFilmR5,R14,R18291-10M-RC
115M0.25WCarbonFilmR34291-15M-RC
11M0.5WMetalFilmR21273-1.0M-RC
12.2K0.5WCarbonComp.R4930BJ500-2.2K
22.2M0.5WCarbonComp.R7,R2030BJ500-2.2M
12.7M0.5WCarbonFilmR15293-2.7M-RC
1220K0.5WMetalFilmR62273-220K
122K0.5WCarbonComp.R5630BJ500-22K
122 Ohms0.5WCarbonComp.R5030BJ500-22
3270K0.5WMetalFilmR37,R3,R12273-270K-RC
13.3M0.5WCarbonFilmR35293-3.3M-RC
13.9M was 6.8M0.5WCarbonFilmR10293-6.8M-RC
2330K0.5WCarbonComp.R36,R2930BJ500-330K
1330K0.5WMetalFilmR39273-330K-RC
2390K0.5WMetalFilmR38,R63273-390K-RC
139K0.5WMetalFilmR61273-39K-RC
14.7K0.5WCarbonComp.R5130BJ500-4.7K
14.7M0.5WCarbonFilmR13293-4.7M-RC
14.7M0.5WCarbonComp.R5830BJ500-4.7M
2470K0.5WCarbonComp.R8,R1930BJ500-470K
1470K0.5WMetalFilmR48273-470K-RC
647K0.5WMetalFilmR6,R16,R47,R52*,R53*,R54*273-47K-RC
268K0.5WMetalFilmR31, R33273-68K-RC
1820K0.5WMetalFilmR9273-820K-RC
1820 Ohms0.5WCarbonComp.R2230BJ500-820
182K0.5WCarbonComp.R5530BJ500-82K
222K1WCeramicComp.R23, R24588-OX-22K
1180 Ohms5WCementR99280-CR5-180
22.7K5WCementR100, R101280-CR5-2.7K
34700 Ohms5WCementR94, R95, R96280-CR5-4.7K
1900 Ohms10WCementR91280-CR10-910
17500 Ohms10WCementR98280-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