A HIGH-PRECISION TUBE PHONO PREAMPLIFIER
by Fred Nachbaur, Dogstar Music ©1998, 2001

5: PARTS LIST, STEREO PHONO PREAMPLIFIER
rev. 05/01
© 1998, 2000 Fred Nachbaur
(See NOTE below for some sources.)


PART DESCRIPTION NOTES
C ------ CAPACITORS
C1-3 .01uF 600V (optional) cer/mylar unl. noted
C4, C6 47 uF 250V electr.
C5 47 uF 350V electr.
C7 100 uF 450V electr.
C8, 9 10 uF 450V electr.
C10-14 2200 uF 16V electr.
C101,201 0.1 uF 50V
C102,202 2.2 uF 50V elect.
C103,203 10 uF 450V elect.
C104,204 47 uF 50V electr.
C105,205 10 uF 50V electr.
C106,206 20uF 250V electr.
C107,207 1 uF 450V electr.
C108,208 100-1000 pF (as needed)
C109,209 1 uF 250V electr.
C110,210 47 pF 250V
C111,211 6800 pF 250V
C112,212 2200 pF 250V

D ------ SEMICONDUCTOR DIODES
D1-3 1N4007 ECG/NTE 125
D4-7 1N4002 or better ECG/NTE 116

F ------ FUSE
F 1 0.25A Slo-blo (MDL) fuse/ holder Holder: Mode 55-800-0, etc.

J ------ JACKS AND CONNECTORS
J P1 2-wire AC plug and cord 5A Mode 30-021-0
J101-103 RCA jack Mode 24-181-0
J201-203 RCA jack Mode 24-181-0

PCB ---- PRINTED CIRCUITS
PCB 1 Preamp PCB (optional) (artwork available from website)

R ----- RESISTORS
R1 470R 1/2W 1/4 5% unless noted
R2, R3 3.3K
R4, R5 1R 2W
R101, 201 100K
R102, 202 100K
R103, 203 47K
R104, 204 1.5K
R105, 205 27K
R106, 206 330K 1/2W
R107, 207 180K 1/2W
R108, 208 91K 1/2W
R109 ,209 160K
R110, 210 51K
R111, 211 22K
R112, 212 100K
R113, 213 47K
R114, 214 27K
R115, 215 4.7K
R116, 216 47K
R117, 217 10K
R118, 218 160K
R119, 219 220K
R120, 220 1K
R121, 221 1.2K
R122, 222 43K

S ------ SWITCHES
S 1 SPST 6A mini-toggle (power) Mode 41-230A-0
S 2 DPDT 6A mini-toggle (power) Mode 42-342A-0

T ------ TRANSFORMERS
T 1 Power Transformer, 12V .5A or better Mode 60-912-0
T 2 Power Transformer, 12V .3A or better Mode 60-912-0

V ------ VACUUM TUBES (VALVES)
V1, 3 12AX7A dual triode
V2 12AT7A dual triode

VR ----- NEON REGULATORS
(Mode 55-120-0)
VR101-3 3x NE-2 matched with VR201-3
VR201-3 3x NE-2 matched with VR101-3

Chassis, as desired
Bottom plate for chassis, if needed
Hookup wire (600V)
Shielded cable, single and double conductor
Perf-board as required for power supply sections
Mounting hardware (bolts, nuts, washers, L brackets for mounting perfboard)
Strain relief for power cord
Terminal strips, phenolic solder type
Tube sockets (3 ea. 9-pin PCB- or chassis-mount)

 
Note:
Many parts such as connectors, pots, etc. can be obtained from any Mode Electronics distributor (visit www.mode-elec.com for the distributor nearest you). The Mode part number for many such components is given above. Tubes and sockets can be ordered online from many suppliers; a search for tubes and sockets will return many such suppliers.


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