Integrated Amplifier
1979
The TA 350 was the 'standard' amplifier in the 1979 series. It provided an output power sufficient for all speakers available in the mass market at that time, and all necessary inputs and controls are avaiable. Of course it does not have the 'luxury' features of the TA 750, but it's still a respectable design of this time.
(taken from the User's Manual)
| RMS Output Power: | 2x50 W |
| Peak Output Power: | 2x70 W |
| Distortion Factor: | <0.25 at nominal output power |
| Nominal Load: | 4 Ohms |
| Intermodulation Factor: | < 1 % (250 Hz/8 kHz, 4:1) |
| Transmission Range: | < 20 Hz ... > 30 kHz for +/- 1.5 dB |
| Power Bandwidth: | < 15 Hz ... > 43 kHz for K = 0.7 % |
| Dampening Factor: | 26 at 40 Hz - 12.5 kHz |
| Nominal Input Voltages/ | 200 mV/470 kOhms/30 dB (Tuner/Tape) |
| Overdrive Resistance | 230 mV/80 kOhms/36 dB (Monitor) |
| (at 1 kHz) | 2 mV/47 kOhms/30 dB (Phono/Micro) |
| Output Levels | 1.2 mV/kOhm at Tape Rec and 40 kHz Modulation |
| Headphone: > 200 Ohms | |
| 4 Speakers: 4-16 Ohms (DIN 41 529) | |
| (2xRoom 1/2x Room 2) | |
| Tone Controls: | Bass: +15 to -15 dB at 40 Hz |
| Treble: +12 to -12.5 dB at 15 kHz | |
| Filter: | 6 kHz Frequency = 8 dB/Oct. |
| Phono deemphasis: | according to IEC resp. DIN 45 336 and 45 357 |
| Signal/Noise Ratio | 60 dB (DIN 45 500, Sht. 6) |
| Dampening between L/R: | > 50 dB at 1 kHz |
| > 40 dB at 10 kHz | |
| Dampening among Inputs: | > 70 dB at 10 kHz |
| Dampening Factor: | 1:13 (1 kHz) / 1:8(40 Hz) |
| General | |
|---|---|
| Semiconductors: | 6 Integrated Circuits |
| 15 Transistors | |
| 1 LED | |
| 6 Diodes, 1 Rectifier | |
| Mains Voltage: | 220/110 Volts at 50/60 Hz |
| Fuses: | Mains 220 V 1 x T 1.6 A |
| 110 V 2 x T 1.6 A | |
| Secondary 2 x T 2.5 A | |
| T 630 mA | |
| Dimensions: | 460 x 145 x 350 mm |
I haven't had any major problems with my TA 350 so far. The only problem so far were corroded connectors that transport the audio signals to the power am board, making one channel rather silent...
The Hifi Chassis 1000 uses a single supply voltage and therefore needs output coupling capacitors. The TA 350 uses two 1500 &mirco;F capacitors per channel, connected in parallel. Since there was not enough board space, the capacitors are 'stacked' and held in place via cable binders. Not a very professional construction, and it might become a problem one day...
(taken from the service manual)
| Cabinet Parts | ||
|---|---|---|
| Position | Order No. | Designation |
| 501 | 309 796 043 | cabinet, brown |
| 502 | 309 796 042 | cabinet, silver |
| 503 | 309 833 542 | front mask, brown |
| 504 | 309 833 543 | front mask, silver |
| 505 | 309 833 544 | cover, printed |
| 506 | 309 833 390 | cover for fuse |
| 507 | 309 770 920 | cabinet foot |
| 508 | 309 833 535 | knob cover |
| 509 | 309 809 952 | toggle switch, brown |
| 510 | 309 809 951 | toggle switch, silver |
| 511 | 309 802 115 | control knob for loudspeaker, input selector |
| 512 | 309 802 113 | control knob for bass and treble |
| 513 | 309 802 117 | control knob for lower part, volume |
| 514 | 309 802 118 | control knob for upper part. volume |
| 515 | 309 800 128 | push button knob |
| Electrical Parts | ||
| Position | Order No. | Designation |
| BS 5340 | 349 654 942 | AF-adjust module |
| BS 5342 | 349 369 991 | input selector switch board |
| BS 5345 | 309 369 986 | re-record board |
| BS 5421 | 349 364 971 | AF power stage board |
| BS 5518 | 309 310 139 | mains transformer with fuse board |
| BS 5526 | 309 369 987 | power supply board |
| BS 5736 | 309 651 971 | headphone connection board |
| BS 5761 | 309 651 970 | loudspeaker socket board |
| FU 1 | 309 625 610 | fuse T 1.6 A |
| S 3/4/5 | 309 630 994 | mains switch, 2-fold |
| 516 | 309 695 935 | power cord with connector, 2-wires |
| AF Adjust Board | ||
| Position | Order No. | Designation |
| BS 5340 | 349 654 942 | AF-adjust module |
| C 305/314/1305 | 309 413 485 | Al-electr. cap. 100 µF/25 V |
| C 311/1311 | 309 410 634 | Al-electr. cap. 4.7 µF/35 V |
| C 315 | 309 413 481 | Al-electr. cap. 100 µF/35 V |
| D 1 | 309 327 022 | LED FLV 110 red |
| IC 301/1301 | 309 368 212 | IC HA 1457 |
| R 303/1303 | 309 511 061 | film variable resistor - volume |
| R 315/1305 | 309 511 062 | film variable resistor - bass |
| R 325/1325 | 309 511 063 | film variable resistor 2 x 100 KOhm - treble |
| S 301 | 309 639 971 | toggle switch 4 x UM |
| 517 | 309 639 006 | frame for 2 toggle switch |
| 518 | 309 639 007 | frame for 4 toggle switch |
| 519 | 309 900 295 | diode holder, 1-fold |
| S 302/303/304 | 309 639 980 | toggle switch, 2 X UM |
| Input Selector Switch Board | ||
| Position | Order No. | Designation |
| BS 5342 | 349 369 991 | input selector switch board |
| BU 301/302 | 309 679 503 | cinch socket |
| BU 303/304/305 | 309 672 801 | DIN socket, 5 contacts |
| C 301/312/ | 309 410 728 | Al-electr. cap. 4.7 µF/40 V |
| 1301/1312 | ||
| C 306/1306 | 309 412 645 | Al-electr. cap. 47 µF/25 V |
| C 308/1308 | 309 414 794 | Al-electr. cap. 100 µF/35 V |
| C 316 | 309 410 634 | Al-electr. cap. 4.7 µF/35 V |
| IC 301/1301 | 309 368 212 | IC HA 1457 |
| L 301/1301 | 309 249 053 | RF choke |
| S 301 | 309 639 005 | rotary switch |
| Re-Record Board | ||
| Position | Order No. | Designation |
| BS 5345 | 309 369 986 | re-record board |
| BU 301/302/303/ | 309 679 503 | cinch socket |
| 304/308/309 | ||
| BU 305/306/310 | 309 672 801 | DIN socket, 5 contacts |
| S 301 | 309 635 911 | pressure switch 6 x UM |
| AF-Power Stage Module | ||
| Position | Order No. | Designation |
| BS 5421 | 349 364 971 | AF power stage board |
| C 402 | 309 412 674 | Al-electr. cap. 47 µF/40 V |
| C 403 | 309 410 634 | Al-electr. cap. 4.7 µF/35 V |
| C 406 | 309 413 515 | Al-electr. cap. 100 µF/16 V |
| C 408/1408 | 309 413 481 | Al-electr. cap. 100 µF/35 V |
| C 412/422/ | 309 414 796 | Al-electr. cap. 1500 µF/70 V |
| 1412/1422/1519 | ||
| C 512 | 309 414 662 | Al-electr. cap. 22 µF/35 V |
| C 518/519 | 309 414 798 | Al-electr. cap. 2200 µF/70 V |
| D 401 | 309 325 027 | diode 1 N 4148 |
| D 502/503/504/ | 309 327 008 | diode MR 751 |
| 505 | ||
| FU 501 | 309 627 910 | fuse T 630 mA |
| FU 502/1502 | 309 627 916 | fuse T 2.5 A |
| GR 501 | 309 320 928 | rectifier B 30 C 400 A 5 |
| IC 502 | 309 368 130 | IC UA 78 GU 1 C |
| L 401/501 | 309 249 053 | RF choke |
| MOD 1/2 | 309 370 953 | AF pre-amplifier |
| R 419/1419 | 309 504 805 | variable resistor S 500/1/0.15 W |
| S 401 | 309 639 996 | thermo switch, 1 contact |
| T 401/1401 | 309 001 918 | transistor BC 238 C |
| T 402 | 309 001 224 | transistor BC 559 B |
| T 403 | 309 001 235 | transistor BC 549 B |
| T 404 | 309 001 206 | transistor BC 546 B |
| T 405/1405 | 309 001 216 | transistor BC 546 |
| T 406/1406 | 309 001 264 | transistor BDV 65 A |
| T 407/1407 | 309 001 265 | transistor BDV 64 A |
| T 408 | 309 001 949 | transistor BC 238 B |
| 520 | 309 651 976 | sockets bar, 7 contacts |
| Power Supply Module | ||
| Position | Order No. | Designation |
| BS 5526 | 309 369 987 | power supply board |
| C 502 | 309 413 497 | Al-electr. cap. 100 µF/50 V |
| C 503 | 309 414 662 | Al-electr. cap. 22 µF/35 V |
| D 501 | 309 325 634 | diode BZY 85 C 16 |
| D 502 | 309 325 027 | diode 1 N 4148 |
| IC 501 | 309 368 234 | IC MC 78 L 15 C |
| Loudspeaker Socket Board | ||
| Position | Order No. | Designation |
| BS 5761 | 309 651 970 | loudspeaker socket board |
| 521 | 309 671 964 | loudspeaker socket, 4 x 2 poles |
| BU 3 | 309 672 917 | coax socket, 2 contacts |
| S 1 | 309 639 008 | rotary switch |
| Mechanical Parts | ||
| Position | Order No. | Designation |
| 522 | 309 863 988 | frame chassis |
| 523 | 309 866 983 | guide |
| 524 | 309 921 915 | mains switch rod |
| 525 | 309 943 017 | shaft |
| 526 | 309 928 904 | clutch |
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