Sansui Tuners
If you have spec sheets or any other literature, please scan them at 150 dpi and send it to me via email.
Note: these linked images are LARGE.
Also see the Integrated Amplifiers page for more tuners
| TU-X1 | TU-919 | TU-719 |
| TU-719, TU-717 and TU-517 Comparison | TU-517 | TU-417 |
| TU-317 | TU-217 |
TU-X1, the mate to the AU-X1, and considered by many to be the finest tuner ever made. courtesy of Sten
TU-919 courtesy of Sten
TU-719 courtesy of Sten
TU-719, TU-717 and TU-517 Comparison
I have recently worked on several vintage Sansui tuners and have some info to report.
The TU-517 and TU-717 are identical with the
following exceptions:
- The TU-717 has a 460khz filter on the input of the AM tuner section. I assume
this is a birdie filter to prevent interference from the 455 khz commonly used
IF frequency of other radio equipment. This circuit is located just above
and to the left of the wheel on the end of the tuning capacitor, in the pic
below. The empty space where the circuit is missing, is shown as a yellow circle
on the TU-517 picture below. It is 2 adjustable inductors and a couple of capacitors.
- The TU-517 has a circuit that is not in the TU-717.
I have recently identified the missing circuit. It is a 19khz MPX trap.
The empty space where the circuit is missing, is shown as a yellow circle on the
TU-717 picture below. It consists of 1 adjustable inductor, a transistor, and a couple of
capacitors.
- The TU-717 has a calibration level switch and oscillator. This is used to set
recording levels on your tape deck as the output is 3 db below the full
modulation level of a radio station.
The following circuit boards are IDENTICAL; power supply, front panel, FM discriminator, main tuner, and output muting.
So if you want the performance of a TU717, consider the TU-517, it's very close. There are literally about a dozen parts not installed in the 517 that are in the 717, including the switches.
The TU-719 is very different inside than a TU-717. One thing it is lacking from the TU-717 is adjustable inductors in the tank circuits of the front end. To get the linearity perfect in the front end requires manually adjusting the coils.
Here's some pics up of the interior of these units.
TU-719 interior
TU-717 interior
TU-517 interior
TU-517 courtesy of M. Landers
TU-417 courtesy of M. Landers
TU-317 courtesy of M. Landers
TU-217 courtesy of M. Landers
