Old Polish radio Amator 2B stereo (DSS201) - schematic diagram, gallery
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Here I will present another popular piece of equipment from the communist era - the Amator radio, or more precisely the 2B version (DSS201). The Amator 2B differs from the Amator 2 in that it has no tuning indicator.
Amator 2 allowed the reception of long wave, medium wave, short wave and FM frequency ranges. The AM intermediate frequency was 465kHz and FM 10.7MHz. Details later in the diagram, and now pictures.
Front and top with the characteristic three vent inserts:
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Rear:
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It is also worth adding that there is a fuse hiding at the bottom of the case to be removed:
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Looking inside:
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Let's start perhaps with the power supply, of course there is a 50Hz mains transformer:
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You can see the fuse and the separate PCB from the slide potentiometers:
PCB, isostat type buttons, tuning scale;
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CEMI, UL1321, UL1601, UL1211 circuits can be seen.
Elwa electrolytic capacitors:
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Tuning mechanism and bulb (incandescent, not LED) from backlight:
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I really like the tuning mechanisms on these types of old radios. This is probably because I grew up with much newer equipment. Here you can see how the bulb is fixed:
Ferrite antenna:
PCB underside:
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However, photos can't show everything. It's time for a bit of documentation.
Schematic of the Amator 2 stereo:
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UL1321 (dual acoustic preamplifier circuit):
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UL1601 (stereo signal decoder circuit):
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UL1211 (AM/FM intermediate frequency amplifier):
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The power amplifier is based on two GML-026s. GML-026 schematic:
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By the way, I see now that I didn't take a photo of them, you can only see their legs in the PCB photo, so I'll use a photo from another topic:
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The photos above show a slightly different circuit, GML-026/2, but I was unable to find GML-026.
Source: https://www.elektroda.pl/rtvforum/topic1869247.html
Summary Summary
Radio potentially up and running. It's not that bad, spares are still obtainable, even GML-026, will there be a bargain for it? Well I don't know, but I'm happy to have shared another old radio with the forum. If anyone has similar specimens in their collection then feel free to post pictures.
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Comments
I think it was the coolest radio I used in those days. I still feel sentimental about it to this day. I wish I had kept it until modern times. [Read more]
It is for this reason that I sometimes try to show this type of equipment in this section, even though I normally deal with digital electronics anyway. All the more reason for me to encourage others to... [Read more]
Where are the 2N3055 transistors from on the schematic of this GML? [Read more]
. The colleague is confusing concepts. First of all: GML-026 and GML-026/2 are two different circuits. At the same time, the radio presented appears to have a factory-installed GML-026/2. It is impossible... [Read more]
Indeed, the photo in the linked thread shows GML-026/2 and not GML-026. When I get a chance I will take a correct photo, unless anyone has one to hand? [Read more]
https://obrazki.elektroda.pl/3921815700_1715011553_thumb.jpg . These are 2N3055 structures bought with the then valuable foreign exchange, hence the later switch to locally produced power transistors, Please,... [Read more]
. 2N3055 was produced by Hungarian Tungsram and Czechoslovakian Tesla (as well as more powerful KD502/503) - so there was no need to buy structures for foreign exchange - CEMI also somehow in the late... [Read more]
this article came to me perfectly here ;p I no longer need to dismantle what I have to look inside out of curiosity :-) Some time ago I told my neighbour that if she had any old electronic equipment... [Read more]
@MarekS6 don't throw it away because it's a shame. A little work and patience and it will play and be a pleasure to the eye. And I found something like this and a vintage one in my stash. https://obrazki.elektroda.pl/5785859500_1715069446_thumb.jpg... [Read more]
The power supply reefs from Amators, still quite reasonably priced and in good quantity at auctions, are currently the cheapest source for rewinding into output transformers for SE and PP tube amplifi... [Read more]
Putting the tuning cable on this receiver is something of a nightmare. The design itself seems unfriendly in terms of disassembly. The Zodiac was better done in this respect. [Read more]
A long time ago I just swapped the frayed line for monofilament, a horrible replacement but not to be outdone. [Read more]
. But functionally they are identical and can be used interchangeably. [Read more]
I own the older brother of the DSS201, in the DSS101 I inserted the LA3101 instead of the UL1321, plus the recommended blocking capacitors on the preamp inputs, it has its years and is not Hi Fi for it... [Read more]
. There is also a difference in the schematic, as the preamp is made with only one transistor + UL1321. [Read more]
. I put it on in "two" with the service manual at hand and managed. In the meantime I've learned that different versions of the "Amateur" had different cable mechanisms. I like it if the internal cable... [Read more]
In the 1980s I had an Amator 3. It had an orange backlight, an indicator on LEDs (red) and a "better", more powerful amplifier on a "pseudo-hybrid" (GML in discrete version, on through-hole components... [Read more]
If you'd had it when the DSS101 was produced and driven the ZG 20 with it, you'd have been a power demon on the estate :) , beautifully looking with their glowing scales with the lights off in the room.... [Read more]
:) I had some ZG for this. As far as I remember 25W. But as it was in my teens, it got destroyed :) . [Read more]