HF TUBE POWER AMPLIFIER
Prof. Yosef PINHASI
Variable Frequency Oscillator
VFO
180
1n
+8V
1n
820
2N4416
2N2222
470
50p
1mH
100K 1K
220K
3.6K
1.5n
2N918
C0
47K
L3
5V
100K
10V
47u 0.1u
1mH
0.1u
0.47u
50p 1N4148
BAND
FREQUENCY
160m
80m
40m
30m
20m
16m
15m
12m
10m
6m
1.8-2 MHz
3.5-4 MHz
7.0-7.3 MHz
10.1-10.15 MHz
14.0-14.35 MHz
18.068-18.168 MHz
21.0-21.450 MHz
24.89-21.99 MHz
28.0-29.7 MHz
50.0-50.2 MHz
100K
12K
0.1u 6.8V
240
100u
L3
C0
16.784 µH
0 pF
4.286 µH
0 pF
Driver and Power Amplifier
10n
+250V
250
1N4004
1N4004
10n
10n
1N4004
+500V
2.2mH
5n
1.4KV
20K
10W
1n
10.5mA
1+
5n
1.4KV
2.5mH
1N4004
6+
15mA
14-115mA
4.7n
5KV
5+
1,5
5-
+250V
1n
100p
0V
250
+500V
2+
+185V
2
6C4
6146A
6
5
7
6
+8.5V
1
4
1mH
2.2mH
4+
TUNE
100pF
25K
1M
800
3+
12
900pF
LOAD
200V
5w
10n
5n
10n
10n
5n
-50V
5n
5n
5n
5n
L
2.08µH
2.56µH
3.03µH
3.49µH
3000
30
2500
20
2000
10
1500
0
1000
-10
500
-20
0
-30
13
13.2 13.4 13.6 13.8
14
14.2 14.4 14.6 14.8
Frequency [MHz]
15
Phase
Output impedance [Ohm]
14MHz
2000Ω
2500Ω
3000Ω
3500Ω
Vpeak=400V ; RLOAD=50Ω
POWER CTUNE CLOAD
40W
70pF 382pF
32W
56pF 326pF
27W
47pF 283pF
23W
40pF 247pF
L
4.09µH
5.03µH
5.95µH
6.86µH
3000
30
2500
20
2000
10
1500
0
1000
-10
500
-20
0
-30
6.5
6.6
6.7
6.8
6.9
7
7.1
Frequency [MHz]
7.2
7.3
7.4
7.5
Phase
Output impedance [Ohm]
7MHz
2000Ω
2500Ω
3000Ω
3500Ω
Vpeak=400V ; RLOAD=50Ω
POWER CTUNE CLOAD
40W 143pF 783pF
32W 114pF 670pF
27W
95pF 583pF
23W
82pF 512pF
Number of turns
5
6
7
8
9
10
11
12
13
14
15
Inductance
1.67µH
2.26µH
2.90µH
3.59µH
4.33µH
5.09µH
5.88µH
6.70µH
7.54µH
8.40µH
9.28µH
Resistance
8.06mΩ
9.68 mΩ
11.3 mΩ
12.9 mΩ
14.5 mΩ
16.1 mΩ
17.7 mΩ
19.4 mΩ
21.0 mΩ
22.6 mΩ
24.2 mΩ
Voltage, current and power meter
1N34
1N34
1mH
6+
100K
5+
RF in
10n
10n
4+
25K
1.2K
2+
1M
1+
1M
1mA
5+
3+
1.
2.
3.
4.
5.
6.
Plate voltage:
Screen voltage:
Grid voltage:
Plate current:
Screen current:
RF Power:
500V
180 - 200V
-40 - -50V
0 - 100mA
0 - 10mA
0 – 100W
100K
Power supply
160VAC
250mA
500mA
+500VDC
1N4005
160VAC
100u
250mA
240K
+250VDC
220VAC
100u
240K
2A
6.3VAC
1N4005
7808
10
+8VDC
1000u
1N4005
1000u
100
1N4005
47K
-50VDC
47V
100u
0.1u
LED