It would be much better to take out the trans diode bridge and Conders from the Comet, buy a TDA-type mikruh, they have a minimal body kit, have enough power and don’t sound bad, take the tone block from the Vega, it’s pretty good there, and stuff all this nonsense into one of Columns Comet I’ll send the rest of Comet and Vega to the trash bin, where they belong.
The blocking of the auto-stop shaper is removed. This option will be much better and will not take up precious space in the girl’s apartment.
The tape recorder is designed for recording sound tracks onto compact cassettes, with subsequent playback. I provide a brief description of the operation of the control circuit modes of the tape recorder. DIY modern speaker system from old Soviet speakers
This option will be much better and will not take up precious space in the girl’s apartment. If you decide to reward a girl with Vega, then first solder the amplifiers in it; they are there on separate boards and sit on pins on the main board; over the years they have become one hundred percent oxidized. With resistor R10 it is possible to set the response time of the autostop driver within a small range. Operating instructions for the Comet MS-3 tape recorder.
By the way, the Note was cut to fit the amplifier. I think the same can be done for the Comet. To ensure that the control circuit is stopped in mode, press the SA3 button on the R reset pins of the DD4 trigger to set the log.
Operating instructions for the Comet MS-3 tape recorder. I provide a brief description of the operation of the control circuit modes of the tape recorder. Time capsule Comet 225s-3 Yubileinaya
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Temporary stop of the tape. After releasing the button on the direct output of the trigger DD4. Edited by Egour - Fri, Nominal output power 2x10, maximum 2x20 W. The tape recorder is designed for recording sound tracks onto compact cassettes, with subsequent playback.
To ensure that the control circuit is stopped in mode, press the SA3 button on the R reset pins of the DD4 trigger to set the log. Exactly the same board is used in the Nota tape recorder
The trigger is DD4. To ensure that the control circuit is stopped in mode, press the SA3 button on the R reset pins of the DD4 trigger to set the log.
Range of recorded and reproduced sound frequencies on chrome oxide magnetic tape Tape recorder Comet M-225S-2 What's inside?
Features of acoustic systems of the Soviet period
The technical parameters of Soviet Hi-Fi speakers (in contrast to broadband loudspeakers with a power of about 5 W, which at that time were universally built into the housings of radios, radiograms, tape recorders, etc.) made it possible to reproduce almost the entire spectrum of audible sound frequencies and developed significantly greater power.
Interesting! The fashion for free-standing acoustics has also affected television receivers. Thus, in the 70s of the last century, at the Minsk Production and Production Association "Horizon" they organized mass production of televisions equipped with autonomous active speakers (the prototype of a modern home theater) with a power of 6 W ("Horizon-106D") and 16 W ("Horizon-723" ). However, due to the low sound quality (frequency band - 63-12500 Hz, etc.), they were not widely used.
Despite the sound quality being quite decent even for today, Soviet speaker systems are outdated. Even connecting them to today's sound sources is not as easy as it seems. Thus, a standard sound card built into modern sound-reproducing devices will not allow sound output to old Soviet speakers . The user will have to buy a fairly powerful and high-quality discrete microcircuit or use such Soviet ULFs as “Brig”, “Amfiton”, etc.
In addition, in order to fully enjoy high-quality sound, old Soviet speakers need to be restored - after all, over the past years they have worn out quite a bit. Typically, the potential user will have to replace:
- old wires for special speaker cables;
- decayed sound-absorbing materials (cotton wool, foam rubber) to more modern ones, for example, padding polyester or fiberglass;
- outdated or worn out components for new ones, etc.
Similar schemes
It wouldn’t matter what class the equipment is and how good it sounds, they don’t give a damn. Thu,
The range of recorded and reproduced sound frequencies on chrome oxide magnetic tape. By the way, the Note was cut “for an amplifier.” I think the same can be done for the Comet.
The tape recorder has: The ability to work with two types of tape. The sensor is a photodiode VD1 illuminated by a LED VD2 with an impeller rotating between them, driven by a rubber belt connected to the cassette receiving unit.
Operating instructions for the Comet MS-3 tape recorder. The trigger is DD4. But neither Comet nor Vega has anything to do with the Electronics brand, both are so-so, half in the middle. After releasing the button on the direct output of the trigger DD4. To ensure that the control circuit is stopped in mode, press the SA3 button on the R reset pins of the DD4 trigger to set the log.
File details Tape recorder Comet 225
Operating instructions for the Comet MS-2 tape recorder. If you decide to reward a girl with Vega, then first solder the amplifiers in it, they sit on separate boards and on pins on the main board, over the years they have become one hundred percent oxidized. The tape recorder is designed for recording sound tracks onto compact cassettes, with subsequent playback. All annual upgrades amounted to minor changes in the design of tape recorders to increase consumer demand. Relative noise level in the recording-playback channel with the Mayak noise reduction system, dB.
Worthy Soviet technology bears the proud name “Electronics”, and it was made in Belarus, Russia and a little in Georgia. When you turn on the tape recorder, the control circuit is switched to mode. I provide a brief description of the operation of the control circuit modes of the tape recorder. Thu,
It wouldn’t matter what class the equipment is and how good it sounds, they don’t give a damn. Temporary stop of the tape. It would be much better to take out the trans diode bridge and Conders from the Comet, buy a TDA-type mikruh, they have a minimal body kit, have enough power and don’t sound bad, take the tone block from the Vega, it’s pretty good there, and stuff all this nonsense into one of Columns Comet I’ll send the rest of Comet and Vega to the trash bin, where they belong. Electronic-logical control of all operating modes. Operating instructions for the Comet MS-2 tape recorder. Gold found NOTA 225
Comparison of Soviet and modern speaker systems
In the USSR, the development and production of household radio-electronic equipment (BREA) was carried out by many enterprises of the military-industrial complex, including the Riga PA "Radio Engineering", the Leningrad VNIIRPA named after. A.S. Popova, Lvov NIIBREA and others. The widespread use of speakers was preceded by the appearance on the domestic market of the prototype of modern music centers - tube stereo radios "Symphony" (1964), which were initially equipped with free-standing sound speakers. Their sound was strikingly different from what citizens of the Union, unspoiled by good sound, were used to hearing. For a long time, these three-way closed-type acoustic systems were the standard of high-quality sound, and even now, despite their hopelessly outdated technical parameters (frequency range - 50-18000 Hz, sensitivity - 92 dB, power - 2x6 W), they are in definite demand.
In the last years of the USSR, mathematical modeling and computers began to be used when designing acoustic systems. Along with a choice of new generation high-performance loudspeakers, this has resulted in a speaker system that delivers high fidelity performance. The best of them are still considered to be the following developments:
- VNIIRPA - 75AS-001 (150AS-001);
- NIIBREA - 35AS DS-017 "Amfiton".
In the 90s of the twentieth century, the Soviet High-End (as they now say) simultaneously with the entire country ceased to exist. Since then, new modifications of speakers have appeared in the world, which use innovative circuitry, as well as more modern technologies and materials. All this makes it pointless to compare surviving speakers from the Soviet period with modern foreign models.
Important! Soviet high-fidelity sound reproduction speakers were multi-band, that is, they output high, mid, and low frequencies through separate speakers. Therefore, their sound quality often exceeds the level of cheap Chinese-made acoustics.
Related materials on the topic:
To ensure that the control circuit is stopped in mode, press the SA3 button on the R reset pins of the DD4 trigger to set the log. Operating instructions for the Comet MS-3 tape recorder.
A classic of the genre, replacing electrolytic capacitors solved the problem. But neither Comet nor Vega has anything to do with the Electronics brand, both are so-so, half in the middle. When you turn on the tape recorder, the control circuit is switched to mode.
Magnetic tape consumption counter. If you decide to reward a girl with Vega, then first solder the amplifiers in it, they sit on separate boards and on pins on the main board, over the years they have become one hundred percent oxidized.
Enabling normal belt motion Pressing the SA5 button turns on the log mode. Its weight is 9.5 kg.
See also: Electrical laboratory services
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The trigger is DD4. Dimensions of the tape recorder xx mm. There were also minor modifications to the circuits. But neither Comet nor Vega has anything to do with the Electronics brand, both are so-so, half in the middle.
But neither Comet nor Vega has anything to do with the Electronics brand, both are so-so, half in the middle. LED indicators of recording and playback levels and operating modes. Relative noise level in the recording-playback channel with the Mayak noise reduction system, dB.
Top 10 acoustic systems of the USSR
During the years of Soviet power, many different speakers were produced in the USSR. And although all of them have served their service life for a long time, they are still in demand among lovers of vintage radio equipment. For example, the price of the rarely seen 35AC DS-017 in online store catalogs is about $1,000. The rating below includes a dozen speakers from the Soviet period, requests for which can most often be found on the Internet.
35AC-012 “Radiotehnika S-90”
This famous three-way speaker with a bass reflex, produced by Radiotekhnika (Riga), was created back in 1975. It was assumed that it would be used with powerful high-class ULFs (Hi-Fi). For a long time, the S-90 was considered the best speaker in the country, losing its position to the latest domestic developments only shortly before the collapse of the USSR.
Main technical and operational criteria 35AC-012 “Radiotehnika S-90”:
| Parameter | Defining value |
| Frequency range, Hz | 25…25000 |
| Sensitivity indicator, dB | 88 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | — nominal — 35; — passport — 90; — short-term — 600 |
| Speaker performance | — LF — 75GDN-1-4; — SCH — 20GDS-1-8; — HF — 6GDV-6-16; |
| Dimensions, mm | 710x360x285 |
| Weight, kg | 23 |
The speaker looks like a non-separable box made of 16 mm chipboard, the surfaces of which are finished with veneer imitating valuable wood species. In this case, the material for the front panel was 22 mm thick plywood. The inside of the box was filled with technical wool. Using the regulators brought out, you can set the required level for HF and MF. Each speaker is protected on the outside by a black metal mesh.
25AS-109 (25AS-309)
This three-way speaker was produced in Berdsk at a local radio factory. Technical and operational criteria 25AS-109 (25AS-309):
| Parameter | Defining value |
| Frequency range, Hz | 40…20000 |
| Resistance indicator, Ohm | 4 or 8 |
| Power indicator, W | — nominal — 25; — passport — 35; |
| Speaker performance | — LF — 35GDN-1-4 (25GD-26B); — SCH — 20GDS-4-8 (15GD-11A); - HF - 5GDV-1-8 (3GD-31). |
| Dimensions, mm | 480x285x260 |
| Weight, kg | 13 |
Structurally, the speaker was assembled in a box made of chipboard. Its outer walls were decorated with veneer, and the facade was covered with a false panel. All speakers were protected by a blackened metal mesh.
50AS-022 "Amfiton" (100AS-022)
This three-way bass reflex speaker was manufactured at the Karpaty Production Association (Ivano-Frankivsk). Technical and operational parameters of 50AS-022 “Amfiton” (100AS-022):
| Parameter | Defining value |
| Frequency range, Hz | 25…25000 |
| Sensitivity indicator, dB | 86 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | — passport — 80; – short-term – 150. |
| Indicators of speakers of our own production | — LF — 75GDN-3-4; — SCH — 20GDS-3-8; - HF - 6GDV-7-16. |
| Dimensions, mm | 675x360x300 |
| Weight, kg | 24 |
The non-demountable AC box was assembled from 18 mm chipboard, veneered. The original appearance of the speakers allowed the designers to abandon the front false panel.
25AS-225 "Comet" (15AS-225)
This is a two-way bass-reflex type speaker produced by a precision engineering plant (Novosibirsk). This audio system was supplied with “Comet” and “Nota” tape recorders. Technical and operational parameters of 25AS-225 “Comet” (15AS-225):
| Parameter | Defining value |
| Frequency range, Hz | 63…16000 |
| Sensitivity indicator, dB | 84 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | -nominal - 15; -maximum long-term - 25 |
| Speaker performance | 25GDN-3-4 and 5GDV-1 (VCh) |
| Dimensions, mm | 328x190x190 |
| Weight, kg | 5,8 |
The AC plywood box was covered with decorative film. The facade with loudspeakers was protected from damage by a metal mesh.
"Motherland" AM0301, AM0302
The variety speakers of this series were assembled at the Lyubertsy Electric Musical Instruments Factory. They were used to provide sound for concert venues. These audio systems operated with powerful tube ULFs.
Technical and operational parameters of “Rodina” AM0301, AM0302, etc.:
| Parameter | Defining value |
| Frequency range, Hz | 45…12000 |
| Sensitivity indicator, dB | 96 |
| Resistance indicator, Ohm | 8 or 16 |
| Power indicator, W | passport - 60 or 100 |
| Frequency response unevenness, dB | 15 |
| Average sound pressure, Pa | not less than 0.15 |
Broadband speakers LOMO 4A-32 (GD3030-1, 30GD-301) and 50-watt RSE-type HF heads were used as sound emitters. All these speakers were installed in an open wooden box, covered on the outside with sound-absorbing material, while providing good sound reproduction where “live” real instruments were playing on a large stage.
50AS-012 "Soyuz"
This is a three-way speaker, the production of which was organized at an electromechanical enterprise in Bryansk. The audio system worked with ULF, the maximum long-term power of which did not exceed 50 W.
Technical and operational parameters of 50AS-012 Soyuz:
| Parameter | Defining value |
| Frequency range, Hz | 40…25000 |
| Sensitivity indicator, dB | 85 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | — nominal — 50; — limit — 90 |
| Speaker performance | — LF — 75GDN-3-4; — SCH — 20GDS-3-8; — HF — 6GDV-7-16 |
| Dimensions, mm | 698x357x273 |
| Weight, kg | 23 |
The box of this speaker was made of 18 mm plywood and was lined with veneer.
50AC-106 "Vega"
This three-way speaker with a bass reflex was produced at the Vega Production Association (Berdsk) and was intended to work with high-quality ULF with a power of no more than 35 W.
Technical and operational parameters of 50AS-106 “Vega”:
| Parameter | Defining value |
| Frequency range, Hz | 40…25000 |
| Sensitivity indicator, dB | 84 |
| Resistance indicator, Ohm | 8 |
| Power indicator, W | — maximum — 50; — maximum short-term — 75 |
| Indicators of speakers of our own production | — LF — 35GDN-1-8; — SCH — 20GDS-4-8; — HF — 10GDV-2-16 |
| Dimensions, mm | 580x280x300 |
| Weight, kg | 15,6 |
The sound-emitting heads were located in a plywood box decorated with veneer. The tweeter, located in the upper third of the façade, had a plastic frame, and the midrange and bass heads were protected from damage by a protective mesh.
25AS-027 "Amfiton" (150AS-007), 150AS-007 "LORTA"
These three-way speakers with a bass reflex were produced both at the Lvov Production Association named after. V.I. Lenin (LORTA), and at the Ferropribor enterprise (Leningrad). They were developed specifically for small spaces.
Technical and operational parameters of 25AS-027 “Amfiton” (150AS-007), 150AS-007 “LORTA”:
| Parameter | Defining value |
| Frequency range, Hz | 25…31500 |
| Sensitivity indicator, dB | 86 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | Maximum passport - 50 |
| Speaker performance | — LF — 50GDN-3; — SCH — 20GDS-3; — HF — 10GI-1-4 |
| Dimensions, mm | 600x320x270 |
| Weight, kg | 25 |
The speakers were assembled in a box made of 18 mm thick veneered chipboard. At the same time, the facade slab had a thickness of 38 mm, which significantly increased its rigidity. All loudspeakers are in decorative frames.
35AC-028-1 “Cleaver”
This three-way speaker was manufactured at an instrument-making plant and was intended to work with high-class ULF with a minimum power of at least 20 W. When using less powerful ULFs, the sound acquired an unnatural character.
Technical and operational parameters:
| Parameter | Defining value |
| Frequency range, Hz | 31,5…25000 |
| Sensitivity indicator, dB | 86 |
| Resistance indicator, Ohm | 4 |
| Power indicator, W | -nominal - 35; - passport - 75; -maximum short-term - 130 |
| Speaker performance | — LF — 75GDN-1L-4; — SCH — 20GDS-1L-8; — HF — 6GDV-4-8 |
| Dimensions, mm | 714x396x357 |
| Weight, kg | 32 |
The rigid AC box, decorated with veneer, was assembled from chipboard and multi-layer plywood. Inside, it is filled with super-thin glass fiber, which effectively absorbs acoustic energy. The façade was covered with a removable decorative panel covered with sound-transparent fabric. LED indicators of overload and power level were displayed on the front panel. This made it possible to visually monitor the input power and record its maximum permissible level, protecting the speakers from damage.
Interesting! The company produced an original “Start” design kit for qualified radio amateurs. With its help, it was possible to assemble a speaker system similar in characteristics to the 35AC-028-1 “Cleaver” speakers.
