Category:Super High Fidelity
Country of Manufacture:Germany
Release dates:1968 - 1973
Speeds: 15, 30
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Ferrite, Glass
Head Configuration: Stereo - Stacked
# Motors: 3
Voltage(s): 110-120v, 220-240v, Multi
Outputs: XLR Balanced
Frequency Response:40Hz to 20kHz
Wow and Flutter:.08% at 15 ips
Signal-to-Noise Ratio:68 dB at 15 ips
Sound quality rating:8 / 10
Long-term reliability rating: 8/ 10
The Telefunken M 28C was a half track broadcast version 0f the M 28 with 38 cm/s and 19 cm/s, balanced inputs and outputs.
No mixing console, microphone amplifiers , VU meters, track switching or A-B switching.
The service manual available in German is approx. 100 pages And may be available through the following links
All electrolytic capacitors should be replaced.
Plug-in connectors connectors should be repaired (re-solder from the PCB, open it and put some lube on the movable areas).
Clean all the relay contacts as no replacement relays are available.
A source that may be worth checking for various things