Leestereo
Super Member
This Kenwood Basic C1 is the matching preamplifier to AK member Unican Eric's Kenwood M1. The M1 received a complete restoration and upgrade (http://www.audiokarma.org/forums/showthread.php?t=608332) and the same was planned for the C1.
The restoration/upgrade included the following:
1. Replacement all of the power supply electrolytic capacitors with higher spec. 105°C, low ESR types (increasing capacity where appropriate and possible).
2. Adjustment of the power supply rail voltages to ~16V for the line stage and ~18V for the phono stage (the original rail voltages exceed the maximum specified for the op amps).
3. Upgrading the op amps to NJM2068DD (line stage) and NJM4580DD (phono stage).
4. Replacement of the signal path capacitors, with either "audio grade" bipolar electrolytic capacitors, film types or C0G types, as appropriate.
Here are some pictures of the Kenwood Basic C1 preamplifier as first received:
The restoration/upgrade included the following:
1. Replacement all of the power supply electrolytic capacitors with higher spec. 105°C, low ESR types (increasing capacity where appropriate and possible).
2. Adjustment of the power supply rail voltages to ~16V for the line stage and ~18V for the phono stage (the original rail voltages exceed the maximum specified for the op amps).
3. Upgrading the op amps to NJM2068DD (line stage) and NJM4580DD (phono stage).
4. Replacement of the signal path capacitors, with either "audio grade" bipolar electrolytic capacitors, film types or C0G types, as appropriate.
Here are some pictures of the Kenwood Basic C1 preamplifier as first received:
Last edited: