Leningrad T1 - rare Sovjet tv set from 1946

[yagosaga]

Originally Posted by Eric H

The chassis looks extraordinarily clean, and look at the size of that power transformer! what Hz did the Russians use then/now?

The Sovjets used 220 Volts, 50 Hz. Due to the lack of suitable television valves, they used different filaments voltages. That's the reason for the large mains transformer. The horizontal frequency is 8,575 Hz. Video bandwidth is appr. 1 to 1.5 MHz.

EHT is generated in the line output circuit, but there is no damper.

- Eckhard

[electroking]

Originally Posted by yagosaga

The Sovjets used 220 Volts, 50 Hz. Due to the lack of suitable television valves, they used different filaments voltages. That's the reason for the large mains transformer. The horizontal frequency is 8,575 Hz. Video bandwidth is appr. 1 to 1.5 MHz.

EHT is generated in the line output circuit, but there is no damper.

- Eckhard

The double diode with both plates tied together (at the bottom right
of the schematic) looks like a damper to me...

[yagosaga]

Originally Posted by electroking

The double diode with both plates tied together (at the bottom right
of the schematic) looks like a damper to me...

I have seen that. But I am not really sure about it. The damper usually is connected with the primary coil, the other end is connected with the plate of the line output tube. This "damper" here has an own coil. It looks like a limiter. But the function of the damper is also to increase the plate voltage of the line output tube.

I have taken a look at the schematics for the Sovjet peoples tv set, the KVN-49. There is absolutely no damper and no double diode.

Kind regards,
Eckhard

[Telecolor 3007]

In Romania you can find a "KVN"-49 at Iashi.