Data set 01
1955 Marconi
Published operating points and test conditions from this source.
Voltage Regulator
Other
@ N STABILOVOLTS STV2 [1]
80
@ N STABILOVOLTS STV280/40
@ N STABILOVOLTS STV2 [2]
40
@ N STABILOVOLTS STV280/40
Published value [1]
0
0-25 M Q be connected between a supply line and each anode of the tube. They may be
Published value [2]
-25
0-25 M Q be connected between a supply line and each anode of the tube. They may be
required= [1]
4 V
required=4V +v and not 4V 4 4v where V is the stabilised voltage per gap, and v is the
required= [2]
4 V
required=4V +v and not 4V 4 4v where V is the stabilised voltage per gap, and v is the
required= [3]
4 V
required=4V +v and not 4V 4 4v where V is the stabilised voltage per gap, and v is the
required= [4]
4 V
required=4V +v and not 4V 4 4v where V is the stabilised voltage per gap, and v is the
extra ignition voltage required per gap. As the ignition currents are of the order of [1]
0 V
extra ignition voltage required per gap. As the ignition currents are of the order of 0-1
extra ignition voltage required per gap. As the ignition currents are of the order of [2]
-1 V
extra ignition voltage required per gap. As the ignition currents are of the order of 0-1
The extra ignition voltage is of the order of
50 V
The extra ignition voltage is of the order of 50 volts per gap, and thus, for the STV
Published value [1]
280 V
280/40 the ignition voltage is theoretically 28050 volts. It should be noted, however,
Published value [2]
40 V
280/40 the ignition voltage is theoretically 28050 volts. It should be noted, however,
Published value [3]
28050 V
280/40 the ignition voltage is theoretically 28050 volts. It should be noted, however,
and a half times the overall stabilised voltage (i.e [1]
420 V
and a half times the overall stabilised voltage (i.e. 420V for the STV280/40). The
and a half times the overall stabilised voltage (i.e [2]
80 V
and a half times the overall stabilised voltage (i.e. 420V for the STV280/40). The
and a half times the overall stabilised voltage (i.e [3]
40 V
and a half times the overall stabilised voltage (i.e. 420V for the STV280/40). The
Where
8 V
Where 8 Vgiab (b) = Variation of stabilised voltage due to supply fluctuation.
Published value
8 V
8 Vstab (L) = Variation of stabilised voltage due to load variation.
Published value
31 A
31, = Variation of load current through tube.
To obtain a stabilised supply of [1]
280
To obtain a stabilised supply of 280 volts, 40 mA with no variation in load.
To obtain a stabilised supply of [2]
40
To obtain a stabilised supply of 280 volts, 40 mA with no variation in load.
Allow [1]
20 mA
Allow 20 mA ionisation current, then supply current = 60 mA.
Allow [2]
60 mA
Allow 20 mA ionisation current, then supply current = 60 mA.
Minimum supply voltage required = [1]
280 V
Minimum supply voltage required = 280 -+ 2%: 420 volts.
Minimum supply voltage required = [2]
2 V
Minimum supply voltage required = 280 -+ 2%: 420 volts.
Minimum supply voltage required = [3]
420 V
Minimum supply voltage required = 280 -+ 2%: 420 volts.
Voltage drop across R = [1]
420 V
Voltage drop across R = 420 —280 = 140 volts.
Voltage drop across R = [2]
-280 V
Voltage drop across R = 420 —280 = 140 volts.
Voltage drop across R = [3]
140 V
Voltage drop across R = 420 —280 = 140 volts.
Example
1 V
Example 1, there is also a voltage change in the tube due to its internal impedance.
A stabilised supply of [1]
140
A stabilised supply of 140 volts, 40 mA is required.
A stabilised supply of [2]
40
A stabilised supply of 140 volts, 40 mA is required.
allow
20 mA
allow 20 mA ionisation current per tube.
Consider also a supply variation of + [1]
109
Consider also a supply variation of +109%, (i.e. +50 volts), then output variation
Consider also a supply variation of + [2]
50
Consider also a supply variation of +109%, (i.e. +50 volts), then output variation
The starting voltage applied to T2 is
280 V
The starting voltage applied to T2 is 280 volts, and the final output required is
Published value [1]
140 V
140 volts, therefore the voltage to be absorbed by Rz is 140 volts.
Published value [2]
140 V
140 volts, therefore the voltage to be absorbed by Rz is 140 volts.
It will be appreciated that the voltage obtained from T;
1 V
It will be appreciated that the voltage obtained from T;1 must be again one and a
half times the output voltage required, as # x [1]
280 V
half times the output voltage required, as # x 280 = 187 volts.
half times the output voltage required, as # x [2]
187 V
half times the output voltage required, as # x 280 = 187 volts.
The nearest gap voltage below this is
140 V
The nearest gap voltage below this is 140 (the second gap) and this is used.
Output variation from Tg = :}%_ [1]
2
Output variation from Tg = :}%_2 = 0-129 volts.
Output variation from Tg = :}%_ [2]
0
Output variation from Tg = :}%_2 = 0-129 volts.
Output variation from Tg = :}%_ [3]
-129
Output variation from Tg = :}%_2 = 0-129 volts.
In order to obtain stabilised voltages in excess of
280 V
In order to obtain stabilised voltages in excess of 280, the tubes may be operated
stabilised voltage of
560 V
stabilised voltage of 560 volts, with evenly spaced intermediate voltages.
as described above in order to obtain stabilised voltages in excess of
140 V
as described above in order to obtain stabilised voltages in excess of 140.
Fig
3 W
Fig. 3. A typical circuit of a stabilised supply unit for a power amplifier
Stabilized voltage
280 V
Published regulated voltage.
Tube current minimum
5 mA
Minimum maintaining current.
Tube current maximum
60 mA
Maximum operating current.
Ignition voltage
420 V
Published minimum or maximum ignition/start voltage as applicable.