Audio Segment

Kücke T-21

Kücke T-21 is a studio-quality stereo FM tuner from the 1980s. It features solid build quality with a sandwich construction, which makes adjustments more challenging. A big advantage is the use of connectors, which allow each board to be easily detached. This particular unit has been fully restored and aligned. The device service manual was not available at the time, so we relied on our experience and IC datasheets when needed. The RF front end PCB design differs from the other boards, suggesting that it was sourced from a different manufacturer.

Manufacturer: Kücke & Co. GmbH
Official website:

1. Kücke T-21 - Front View1. Front View
2. Kücke T-21 - Back View2. Back View
3. Kücke T-21 - On the Desk3. On the Desk
4. Kücke T-21 - On the Desk4. On the Desk
5. Kücke T-21 - Stations Board5. Stations Board
6. Kücke T-21 - Inside View6. Inside View
7. Kücke T-21 - Inside View7. Inside View
8. Kücke T-21 - Inside View8. Inside View
9. Kücke T-21 - Inside View9. Inside View
10. Kücke T-21 - Inside View10. Inside View
11. Kücke T-21 - Inside View11. Inside View
12. Kücke T-21 - Inside View12. Inside View
13. Kücke T-21 - Display Board13. Display Board
14. Kücke T-21 - Inside View14. Inside View
15. Kücke T-21 - RF Front End15. RF Front End
16. Kücke T-21 - RF Front End16. RF Front End
17. Kücke T-21 - Inside View17. Inside View
18. Kücke T-21 - Inside View18. Inside View
19. Kücke T-21 - Inside View19. Inside View
20. Kücke T-21 - Tuner Alignment20. Tuner Alignment
21. Kücke T-21 - Inside View21. Inside View

General Specifications

Antenna Input: 75Ω
FM Tuning Range: 87.5MHz-108.0MHz
Frequency Response (-1dB): 15Hz-15KHz
Dimensions (WHD): 451×100×365mm

FM Tuner

Measurements of the tuner section were performed using an FM signal generator, with its output fed directly into the antenna input. AM measurements were not conducted.

22. Kücke T-21 - FR Mono - Left Chanel22. FR Mono - Left Chanel
23. Kücke T-21 - FR Mono - Right Chanel23. FR Mono - Right Chanel
24. Kücke T-21 - FR Stereo - Left Chanel24. FR Stereo - Left Chanel
25. Kücke T-21 - FR Stereo - Right Chanel25. FR Stereo - Right Chanel
26. Kücke T-21 - THD Mono - Left Chanel26. THD Mono - Left Chanel
27. Kücke T-21 - THD Mono - Right Chanel27. THD Mono - Right Chanel
28. Kücke T-21 - THD Stereo - Left Chanel28. THD Stereo - Left Chanel
29. Kücke T-21 - THD Stereo - Right Chanel29. THD Stereo - Right Chanel
30. Kücke T-21 - Separation Left Off - Left Chanel30. Separation Left Off - Left Chanel
31. Kücke T-21 - Separation Right Off - Right Chanel31. Separation Right Off - Right Chanel
32. Kücke T-21 - IMD Mono - Left Chanel32. IMD Mono - Left Chanel
33. Kücke T-21 - IMD Mono - Right Chanel33. IMD Mono - Right Chanel
34. Kücke T-21 - IMD Stereo - Left Chanel34. IMD Stereo - Left Chanel
35. Kücke T-21 - IMD Stereo - Right Chanel35. IMD Stereo - Right Chanel
36. Kücke T-21 - THD vs Frequency Mono - Left Chanel36. THD vs Frequency Mono - Left Chanel
37. Kücke T-21 - THD vs Frequency Mono - Right Chanel37. THD vs Frequency Mono - Right Chanel
38. Kücke T-21 - THD vs Frequency Stereo - Left Chanel38. THD vs Frequency Stereo - Left Chanel
39. Kücke T-21 - THD vs Frequency Stereo - Right Chanel39. THD vs Frequency Stereo - Right Chanel