| Year | Type | Ref. | Tubeset |
| Interpret 569W | 8LN335 | 2*ECH4, EBF11, EL12/325, EM4, AZ4 | |
| Mentor II | 8LN336 | 2*ECH4, 2*EF40, ECC40, EM4, 2*AD1, AZ4 | |
| Studio I = Interpret 569W | 8LN335 | 2*ECH4, EBF11, EL12/325, EM4, AZ4 | |
| Studio II = = Mentor II | 8LN336 | 2*ECH4, 2*EF40, ECC40, EM4, 2*AD1, AZ4 | |
| Standard | 8LN337 | 2*ECH4, EBL1, EM4, AZ4 | |
| Tonfilmanlage KII Universalverst. | 8LN338 | EF40, 2*ECC40, 2*EL41 |