| Preamplifier | Production period |
| 099 | 2010 — 2019 |
| 011 | 2001 — 2010 |
| 935 MK2 | 1997 — 2004 |
| 935 MK1 | 1993 — 1997 |
| Concerto | 1992 — 1995 |
| 897 | 1989 — 1995 |
| 877 MK2 | 1990 — 2000 |
| 877 MK1 | 1987 — 1990 |
| 870 MK2 | 1990 — 1992 |
| 870 MK1 | 1987 — 1990 |
| 846 | 1984 — 1990 |
| 838 | 1983 — 1991 |
| 808 MK3 | 1985 — 1999 |
| 808 MK2 | 1983 — 1985 |
| 808 MK1 | 1980 — 1983 |
| 785 | 1979 — 1988 |
| 777 | 1977 |
