604-S

RIZ, Radio Industrija Zagreb; Zagreb

Data
Forum
Pictures
Collections

  • Year
  • 1960
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 205919
    • alternative name: Radioindustrija Zabreb

 Technical Specifications

  • Number of Tubes
  • 11
  • Main principle
  • Superheterodyne (common); ZF/IF ?/10700 kHz
  • Wave bands
  • Broadcast, Long Wave, Short Wave plus FM or UHF.
  • Power type and voltage
  • Alternating Current supply (AC) / 110/220 Volt
  • Loudspeaker
  • 4 Loudspeakers
  • Power out
  • 10 W (unknown quality)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 604-S - RIZ, Radio Industrija Zagreb;
  • Shape
  • Tablemodel, low profile (big size).
  • Dimensions (WHD)
  • 650 x 360 x 290 mm / 25.6 x 14.2 x 11.4 inch
  • Notes
  • Stereo AF amplifier 2 x 5 W. Similar to model 604. Four oval loudspeakers.
  • Net weight (2.2 lb = 1 kg)
  • 17 kg / 37 lb 7.1 oz (37.445 lb)
  • Literature/Schematics (1)
  • Opravka radio aparata / V. Mesaroš, 1965
  • Author
  • Model page created by Danko Tkalec. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum

Forum contributions about this model: RIZ, Radio: 604-S

Threads: 1 | Posts: 18

A few years ago, I’ve tried to upgrade one of my great valve radios to be a full stereo device.

It was some kind of Grundig set, license produced in my country, with 11 valves, two separate channels with two output transformers with EL84-s.

I was thinking about possibility to make them a full stereo, putting inside a stereo decoder.

I have use a MC1310 chip, put whole construction in old screening IF transformer can, because chip is very small and don’t look so odd on chassis.

Thing works, but never give a good quality stereo sound.

A stereo indication lamp glows even on weaker stations, but sound is a little distorted, and stereo effect is poor.

My thoughts are that MC1310 isn’t so bad quality chip, like are my results in this project.

Probably something missing in this project, like signal level adjustment in and out of the decoder, some kind of output filtering etc. ; something what  good quality sets have calculated in factory production.

Is anyone of you tried to do something like this, and what were the results?

Sorry I can’t write German, but I know read and understand them, so any comment is welcome.

Here is a schematic diagram, red lines shows like I’ve connect a decoder.

Best regards.

Attachments

Berislav Bradaric, 26.Dec.11

Weitere Posts (18) zu diesem Thema.