HP 450A Operating And Servicing Manual page 19

Model 450A
Section V
Circuit
Description Mfr.
*
<Fp
TQ
RS
Ref.
Stock No.
R17 Same as R1
R18
Resistor: fixed, composition, 01121 0693-1031
2
1
10,000 ohms ±10%, 2 W
R19
Resistor: fixed, composition, 01121 0690-5631 1 1
56,000 ohms ±10%, 1 W
R20 Not assigned
R21
Resistor: fixed, wirewound, 35434 0816-0003 1 1
500 ohms ±10%, 10 W
R22
Resistor: fixed, composition, 01121 0690-5641 1 1
560,000 ohms ± 10%, 1 W
R23 Same as R18
R24 Resistor: fixed, composition, 01121 0690-3331 1 1
33,000 ohms ±10%, 1 W
R25
Resistor: Optimum value selected at
factory.
R26 Resistor: fixed, composition,
01121 0690-8231 1 1
82,000 ohms ±10%, 1 W
R27
Resistor: variable, wirewound,
28480 M-77 1 1
)
linear taper, 10 ohms
R28
Resistor: fixed, composition, 01121 0687-6811 1 1
680 ohms ± 10%, 1/2 W
R29
Resistor: fixed, composition, 01121 0690-1511 1 1
150 ohms ±10%, 1 W
Sl,2 Switch, toggle
04009 3101-0001 2 1
T1
Transformer, power 28480 9100-0016 1 1
.
V1, 2, 3
Tube, electron: 5654 86684 1923-0001 3
3
V4
Tube, electron: 5Y3GT 86684 1930-0010 1 1
V5 Tube, electron: 6AU5GT 33173
1923-0020 1
1
V6
Tube, electron: 6AV6 82219 1939-0001 1 1
V7
Tube, electron: OA2 97966 1940-0004 1 1
)
*
Refer to
II
List of Manufacturers"
TQ Total Quantity used in the instrument.
RS Recommended spares for one year
isolated service for one instrument.
Figure 5-1. Replaceable Parts (Sheet 3 of 4)
00001-1
5-3