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

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

• Service Manual

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