Modern TS E 47-730

The Modern TS E 47-730 is a black-and-white television set made by Electronica in Bucharest, with a 47 cm, 110° picture tube and a transistorised channel selector with varicap tuning; the power stages still used tubes [1]. Compared with the Opera, the Modern family also has a sound IF stage with one silicon transistor [1]. The TS and ST models have no tone control [1]. The text calls it the Modern TS E 47-720 [1].

In 1970 the Miraj chassis received a channel selector with continuous tuning by varicap diodes, using Siemens AF109R and AF106 transistors and BB109 varicaps; the expensive, failure-prone turret tuner had had its day [1]. This first transistorised channel selector for the OIRT standard had been designed by Eugen Statnic in Munich in 1966 [1]. From 1970 a new series with this selector was approved – Opera E 59-711, Clasic E 59-701, Lux E 65-700, Modern TS, Olimp TS E 47-740, Venus TS E 47-742, Aria E 47 and others – while tubes were kept in the power stages until 1976 [1]. A push-button unit stored six stations, and about 600,000 germanium selectors were made in 1970–1972; the selector was later modernised with IPRS silicon transistors (BF200, BF183, BF182) and BB139 varicap diodes made under an ITT Intermetall licence [1]. The Opera family was the first with a complete transistorised channel selector on a small printed circuit [1].

Other models of the same group: Opera E 59-711, Opera E 59-722, Clasic S E 59-701, Clasic E 59-722, Lux S E 65-700, Olimp TS E 47-740, Venus TS E 47-742, Venus ST E 47-744.

In the source table, video sensitivity is given for 6 V rms on the picture-tube cathode, the signal-to-noise ratio on the sound path, and the selectivity values are, in order, the rejection of the own sound carrier and of signals below and above the picture carrier (and, where given, of the IF and the image frequency); the audio response is at −3 dB [1].