Grundig radio 1957 model 3088 (Algemeen)

door Pandu Rajan , 07.10.2016, 06:14 (2971 dagen geleden) @ hyperbo

Dear Mr. Dirk

The above set was imported by one of my friends from Germany.The set has been fully restored and all the capacitors have been replaced including the main filter capacitor 50ufd + 50UFD. All the bands are working correctly and the set is in excellent working condition. The sound quality is superb. The only problem was with the dial cord. It was given to a local technician for solving the problem but he was unable to understand the system and he could not do it. I have solved the problem and have given the details in my earlier postings.Now both the dial cords are working correctly.
In India valve sets with FM were never manufactured. FM transmission came to India very late and the valve sets manufacturing was stopped after 1972/73. So this type of problem was never faced in India. Some time back I restored a Telefunken Concertino radio set of 1961 but in this set the FM and the AM bands are Tuned by separate knobs and hence this type of problem was not there.
For me also it took some time to understand the mechanical system.
Now the only problem is the High volume even when the volume control is in zero position. This is more noticable in the FM band where the gain is quite high as all the stations are local.I have checked the volume control R34 and it is O.K. the resistance R35 390 ohms is also O.K. The ground connection of R35 is also O.K. Can this problem be due to the valve EABC80?
For the time I do not have this valve in spare as this valve was never used in Indian radio sets. I think because of the resistance R35 there will be some signal voltage even in zero position of the volume control.

Regards

P. Rajan