My Telefunken Collection


STP 1



Device Type

Pre-Amplifier

Start of Sale

1980

General Description

THE STP 1 was the pre-amplifier in Telefunken's 1980 'state of the art' Hifi System, and is the companion for the STM 1. However, while the STM 1 was a more or less an exact copy of the TA 750's power amp section, the STP didn't take over all the bells and whistles of the TA 750's pre-amp section. Instead, it's a straight and simple pre-amplifier with everything that is typically needed.

like all components from this system, the STP 1 was also available as a non-rackmount version, which was named CP 20.

NOTE: This unit lacks the original top cover, which was dark brown and not grey.

Features

microphone jack, tape-to-tape copy

Connectors

2xPhono (2xDIN, 1xCinch), Monitor (DIN+Cinch), Aux (DIN+Cinch), Tape (DIN), Microphone (DIN), Output (DIN)

Technical Data

(taken from the service manual)

Phono Deemphasis: according to DIN 45 547
Nominal Input Voltages/ 210 mV / 470 kOhm / 33 dB (tape)
Nominal Input Impedances/210 mV / 470 kOhm / 33 dB (aux)
Overdrive Reserve: 240 mV / ~80 kOhm / 36 dB (monitor)
2.0 mV / 47 kOhm / 33 dB (phono)
1.6 mV / 47 kOhm / 33 dB (micro)
Output Level at Nominal 1 V at output socket
Output Level: 1.4 mV / kOhm at tape socket
1.2 V at record socket
Signal/Noise Ratio 62 dB (tape/aux)
According to DIN 45 500: 60 dB (phono/micro)
Channel Separation: > 55 dB at 1 kHz
> 40 dB at 10 kHz
Input Separation: > 50 dB at 10 kHz
Tone Control: bass: +16 to -16 dB at 40 Hz
treble: +12 to -12 dB at 15 kHz
Balance Control: +3 to -13 dB
Noise Filter: 6 kHz turnover frequency, 12.5 dB/oct.
Semiconductors: 4 integrated circuits
4 transistors
1 diode
1 LED
Power Supply: 220 / 110 V AC
Fuses: Mains 220V = 1 x T 80 mA
110V = 1 x T 160 mA
Secondary 2 x T 100 mA
Dimensions: 482 x 80 x 350 mm (W x H x D)
Weight: 5.4 kg

Common Failures

The STP 1 uses selen-based rectifiers in its power supply - the small, 4-legged red boxes with an AEG logo. These devices have a finite lifetime, so expect them to die some day. Otherwise, there is not much in the STP 1 that could break, apart from the usual problems with scratching pots. An yes, the STP 1 also belongs to the generation of devices that fights with broken power switches...

Spare Part Numbers

(taken from the service manual)

Cabinet Parts
Position Order No. Designation
501 309 796 047 cabinet, brown
309 796 049 cabinet, champagner
502 309 863 991 chassis
503 309 833 584 front mask, brown (STP 1)
309 833 501 front mask, champagner (STP 1)
309 833 599 front mask, brown (CP 20)
309 833 600 front mask, champagner (CP 20)
504 309 853 973 handle for cabinet
505 339 061 750 rubber foot
506 309 802 115 control knob for range
507 309 802 113 control knob for treble, bass,
bass, volume
508 309 800 131 push button knob for noise, copy,
mono
509 309 809 951 toggle switch knob
510 309 833 585 knob cover
511 309 921 921 mains switch rod with knob
Electrical Parts
Position Order No. Designation
BS 5318 349 654 944 AF adjust module
BS 5342 349 369 991 input selector switch module
BS 5345 309 369 986 copy module
BS 5351 309 362 014 switch module
BS 5519 309 310 137 mains transformer with fuse board
BS 5522 309 369 985 power supply board
BU 1 309 672 921 microphone socket
BU 2 309 672 922 output socket
D 1 309 327 022 LED FLV 110 red
FU 1 309 627 917 fuse T 80 mA
514 309 695 935 power cord
515 309 630 023 mains switch
516 309 632 947 switch 2 x UM
AF Adjust Module
Position Order No. Designation
BS 5318 349 654 944 AF adjust module
C 315 309 412 645 Al-electr. cap. 47 µF / 25 V
C 318 309 412 655 Al-electr. cap. 47 µF / 50 V
C 319/323 309 412 644 Al-electr. cap. 47 µF / 16 V
C 320/324-326 309 410 634 Al-electr. cap. 4.7 µF / 35 V
IC 301/302 309 368 212 IC HA 1457
R 316 309 511 068 film var. resistor 2x100 kOhm - volume
R 344 309 511 069 film var. resistor 2x25 kOhm - balance
R 354 309 511 070 film var. resistor 2x100 kOhm - bass
R 373 309 511 071 film var. resistor 2x100 kOhm - treble
S 301 309 639 971 toggle switch 4 x UM
S 302 309 639 977 toggle switch 5 x UM
Input Selector Switch Module
Position Order No. Designation
BS 5342 349 369 991 input selector switch module
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, 6 positions
Copy Module
Position Order No. Designation
BS 5345 309 369 986 copy module
BU 301/302/ 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
518 309 921 922 switch rod
Switch Module
Position Order No. Designation
BS 5351 309 362 014 switch module
C 302 309 412 674 Al-electr. cap. 47 µF / 40 V
C 306/1306 309 410 634 Al-electr. cap. 47 µF / 25 V
C 501 309 414 694 Al-electr. cap. 220 µF / 25 V
C 502/503 309 413 485 Al-electr. cap. 100 µF / 25 V
D 301 309 325 927 diode 1 N 4148
L 301/1301 309 249 083 filter coil 120 kHz
S 301/302 309 635 915 pressure switch, noise/mono
T 301/1301 309 001 242 transistor BC 550 C
T 302/1302 309 001 241 transistor BC 238 C
Power Supply Board
Position Order No. Designation
BS 5522 309 369 985 power supply board
C 503/509 309 414 770 Al-electr. cap. 470 µF / 40 V
FU 501/502 309 627 906 fuse T 100 mA
GR 501/502 309 320 928 Se-rectifier B 30 C 400 A 5
IC 501/502 309 368 178 IC UA 78 MGU 1 C
L 501/502 309 249 053 RF choke
R 502 309 504 402 variable resistor 1 K/1/0.15 W
Mechanical Parts
Position Order No. Designation
520 309 943 021 shaft (input selector switch)
521 309 928 904 clutch
522 309 900 295 diode holder, 1-fold
523 309 653 501 fuse holder

Available Documents


Back to List
©2002 Alfred Arnold, alfred@ccac.rwth-aachen.de