Valve Data - Racal Instruments RA-117 User Manual

18. Valve Data

INTRODUCTION
1. Details of valves used in the receiver are given in Tables 1 and 2 overleaf. The location
of valves is shown in fig. 8 and valve base connections are given in the circuit dia-
gram. Voltages were obtained from a B9A or B7G stand-off valve base using a 20,000
ohms/volt meter on the optimum range in each case. Valve pin numbers are indicated
in brackets in Table 2.
2. The receiver was set as follows:-
(1) SYSTEM switch to MAN.
(2) R.F./I.F. GAIN to MAX.
(3) No signal i.e. first and second v.f.o. off tune.
(4) B.F.O. off except for checking V19.
(5) SYSTEM switch to CAL in order to check V13 and V15 only.
Pin 6AK5W 6ES8
No. M8100 ECC189
1 Grid1 Anode2
2 Cathode Grid2
& Grid3
3 Heater Cathode2
4 Heater Heater
5 Anode Heater
6 Grid2 Anode1
7 Cathode Grid1
8 Cathode1
9 Screen
Base B7G B9A
Cct. Type
Ref. Anode Screen
V1 140(5) 75(6)
V2 165(5) 120(6)
V3 172(1) -
90(6)
V4 175(5) 120(6)
V5 175(5) 95(6)
V6 196(5) 85(6)
V7 173(7) 120(9)
TABLE 1.
6AS6 6BA6 6688
EF93 E180F
Grid1 Grid1 Cathode
Cathode Grid3 Grid1
Heater Heater Cathode
Heater Heater Heater
Anode Anode Heater
Grid2 Grid2 I.C.
Grid3 Cathode Anode
Grid 3
& Screen
Grid2
B7G B7G B9A
TABLE 2
Cathode American
1.16(2) 6AK5W
3.0(2) 6AK5W
1.1(8) 6ES8
2.0(2) 6AS6
- 6BA6
0.95(2) 6BA6
0.85(1) 6688
[67]
12AT7 6BE6W
ECC81
Anode2 Grid1
Grid2 Cathode
& Grid5
Cathode2 Heater
Heater Heater
Heater Anode
Anode1 Grid2
& Grid 4
Grid1 Grid3
Cathode1
Heater C.T.
B9A B7G
Equivalent Function
M8100 Crystal osc./
amplifier
M8100 Harmonic
generator
ECC189 R.F.amplifier
Harmonic mixer
EF93 First v.f.o.
EF93 37.5 Mc/s
amplifier
E180F First mixer
6AL5 6AQ5
EB91
Cathode1 Grid1
Anode2 Cathode
& Grid3
Heater Heater
Heater Heater
Cathode2 Anode
Screen Grid2
Anode1 Grid1
B7G B7G