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I would like to invite you to a short photo gallery and documentation of another radio receiver from my collection - a mono Beskid from the Unitra Diora stable, also known as DMP-411. This receiver was produced in the 1970s-80s and allows to receive radio waves in the long (165-285 kHz), medium (525-1605 kHz), short (5.96-9.8) MHz and UKF OIRT (65.5-73.5 MHz) ranges. It also allows connection of a DIN input (e.g. from a tape recorder). It is powered from the mains, still 220V/50Hz, power consumption approximately 10W.
Unitra Diora Beskid from outside .
The front panel is made of black plastic, the case is made of plywood:
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On the front panel, we see the main switch and four isostat switches for changing the ranges (U, D, S, K). There is also a 'hidden' function there - pressing U and D simultaneously activates the DIN (tape) input. In addition to this, there are two sliders (in my case without 'heads') for adjusting the strength and timbre of the sound.
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The fibreboard is removable at the back.
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On the rear panel there is an aerial output and a DIN-type turntable/magnetophone output. This output is activated by pressing the D and S range selector keys simultaneously.
The radio is a box just under 14cm high, 18cm deep and 52cm wide.
Unitra Diora Beskid inside .
The back plate is removed by loosening three screws:
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Inside you'll notice a ferrite antenna, an incandescent light bulb (backlighting), a 50Hz mains transformer (it's not those days that switching power supplies were popular) and a single TONSIL GD10-16/5/2 5W 4Ohm speaker.
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To get further, loosen the screws holding the catches in the housing groove:
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PCB freed from its hooks, which need to be loosened from the underside of the case:
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Extending the front end from the PCB, you can see the adjustable capacitor used for tuning by changing the capacitance:
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In the photos I have tried to capture the characteristic components of the time well, here for example you can see the isostat switches, filters, coils (also those with an air core) and even the BF195 and BF194 transistors in those characteristic housings of theirs. You can also see the tuning mechanics with the string.
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There's quite a bit of dirt around the front, but I shouldn't complain anyway, it's the best preserved electro-junk receiver I've come across so far.
Volume and tone potentiometers:
Unitra Zatra TS 6/10 mains transformer:
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Finally the integrated circuits - the radio is realised on UL1211 and UL1402.
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What is the UL1211? Below you have it in Polish:
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And about the UL1402:
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Whole PCB:
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From the underside I did not take a photo, but it is rather clear that it is single-sided and the assembly is through-hole (THT).
Finally, the schematic. The schematic has already appeared on our forum several times, but for the sake of convenience I will post it here anyway:
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According to the information I found the schematic fits related receivers: Silesian DMP-401, Beskid DMP-411 and Giewont DMP-413.
Summary .
This radio is older than I am and in my childhood I was not likely to encounter such wonders any more, but I still liked it very much, especially as it is one of the better preserved copies that came into my hands.
Some time ago I posted a similar topic on the forum about UNITRA Snowball R-207 and if another similar receiver falls into my hands, I will be happy to document it too.
And what radios do you guys have in your collections? The first 5 posts by different users with a photo with a card with an Elektroda nickname and Unitra equipment in the background will get 200 Elektroda points from me.
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