Tube Line Preamplifier Progect 1

Tube Line Preamplifier Project

Tube_line_preamplifier_1.gif (22844 bytes)

Fig.1

�� , �� . �� , �� . �� , �� , �� . �� Fig. 1. �� . �� . �� Cascade S.R.P.P (Shunt Regulated Push �Pull) �� Cathode Repeater, �� . �� S.R.P.P �� ECC82 (U1a-b), �� , �� . �� R.F �� , �� . �� , �� MKT. �� , �� . �� VOLUME �� BALANCE, �� . �� Cathode Repeater , �� ECC81 (U2a). �� . �� . �� , �� , ��, �� . �� , �� . �� , �� , �� . � �� . �� RL6, � �� , �� , �� . � RL6 �� , �� . �� . �� SEL- DELAY, (Fig.2).

	Part List

R1-7=1Mohm

R12-13=100ohm

C9=4.7uF 250V*

R2=100Kohm 1W

C1=220nF 250V*

U1=ECC82

R3-8=1Kohm 1W

C2=220pF ceramic or mylar

U2=ECC81

R4=1.2Kohm 1W

C3=2.2uF 350V*

RV1=2X100Kohm log.

R5-11=5.6Kohm 2W

C4=1000uF 16V

RV2=2X100Kohm lin.

R6=100Kohm

C5-6=2X50uF 450V

RL1....6=Relay 12V 2X2 [1A]

R9=22Kohm

C7=1uF 250V*

R10=100Kohm

C8=220nF 630V

*polypropylene or MKT

Input Selector - Delay Drive

Tube_line_preampl_sel_delay_1.gif (19321 bytes)

Fig.2

�� Fig. 2 , �� . � �� S2, �� (Fig. 1), �� JF3/1�..6 . �� Led (D1�.D5). �� . �� Fig. 2, �� , �� IC1. � �� (10��), R6, C2, �� RL7 �� , �� . �� , �� , �� . � �� RL7 �� Q1, JF3/9-10 �� LED (D10). �� RL7 �� , �� R8, C3 (20��) , �� Q2 �� RL6 �� JF3/7-8, �� . �� LED (D11). �� S3, �� , �� Q2 �� 0V, �� RL6, �� ( MUTE). �� . �� +12V �� +V DELAY, � �� IC1. �� .

	Part List

R1.....5=1.2Kohm

C2=10uF 25V

Q1-2=BD679

R6-8=1Mohm

C3=22uF 25V

IC1=4081

R7-9=10Kohm

D1......5=3mm Red LED

S2=SEL 1X6 step

R10-11=1.2Kohm

D6......9=1N4148

S3=1X2 mini switch

C1=100nF 100V

D10-11=3mm Green LED

Power Supply

tube_line_preampl_power_supply_1.gif (26771 bytes)

Fig.3

�� Fig. 3 �� . �� . �� , �� . �� (��) . �� . �� , �� . �� PHONO. �� PHONO. �� RL7 �� . �� , �� [IC1-2]. �� . �� , �� . � �� (�� 1.5�� 1W �� , �� ) �� . �� . �� +12V[IC3], �� . �� D7,R7,D8,C20 �� IC1 [Fig. 2], �� +12V �� zener D8. �� [+V DELAY] �� '' �� '' �� , �� , �� . �� C20 �� . To Block �� Fig.3. �� , �� 0V, �� , �� , �� , �� 0V �� . � �� PHONO �� .

�� : Tube PHONO Preamplifiers with ECC83

	Part List

R1=2.2Kohm 5W	C8-13=10uF 16V	IC3=7812 [1A]
R2-4=100Kohm 2W	C10-15-19-20=47uF 25V	T1=230Vac / 200V 0.15A
R3=680ohm 5W	C16=470uF 25V	T2=230Vac / 12V 3A
R5-6=220ohm	C17-18=100nF 100V	F1=0.2A slow
R7=470ohm 1W	BR1=4 X 1N5408	F2=0.1A fast
TR1-2=4.7Kohm trimmer	BR2=4 X 1N5408	S1= Switch 2X2 10Aac
C1=33nF 630V	BR3=4 X 1N4007	RL7=12Vdc Relay 2X2 10A
C2.....5=2X50uF >350V	D1.....7=1N4007	EMI RF Filter 230Vac/6A
C6=4700uF 25V	D8=12V 0.5W zener	* with heatsink
C7-9=100nF 100V	IC1-2=LM317*

[ Tube Line Preamplifier Project 1 in English ]

Sam Electronic Circuits 12/01

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