| KyteLabs InfoBase - Electron Tubes & Valves Data | Last modified: 2021-11-07 (20458) |
| A | Anhang Appendix |
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| A.2 | Hinweise und Bemerkungen Notes and Remarks |
1:
Input signal level is adequate to swing the grid to the point where it starts to draw current.
The Total Harmonic Distortions are approximately proportional to the output signal level.
2:
This tube has a center-tapped heater or filament and can be used with both sections in parallel, at half the rated heater voltage, and twice the current.
3:
Special-Quality (SQ) Premium Tube.
Improved-reliability, trustworthy long-life type.
4:
Subminiature type.
5:
Filament type cathode.
6:
Ua and Ug2 maximum rating with cold tube or with the tube cutoff.
7:
This tube has two separate heaters that can be used parallel or serial connected.
8:
Both sections are connected in parallel.
9:
Bias voltage generated by positive grid-supply voltage and high-value cathode resistor.
10:
Bias voltage generated by negative grid-supply voltage and additional cathode resistor.
11:
Not suitable for applications that are critical as to microphonics and hum.
12:
Metal type.
13:
This tube satisfies the specifications in accordance to MIL-E-1.
14:
Contact-potential bias by Rg1.
15:
For telecommunications systems.
16:
Controlled heater warm-up characteristic. 
17:
Frame-grid construction.
18:
Short gold-plated terminals.
19:
Long tin-plated terminals.
20:
Glass type with external metal shield.
21:
The heaters of the two sections are connected in parallel.
22:
Permanent tone level - single tone input signal.
Continuous sine-wave drive.
23:
Voice or music level.
24:
Self bias by common cathode resistor Rk (Rkk).
25:
Common screen-grid resistor Rg2 (Rg2g2).
26:
Characteristics when used as radio-frequency amplifier.
27:
Variable control-grid bias voltage at Rg1.
28:
Grid no.1 tied to grid no.2 (High-µ connection), grid no.3 to ground.
29:
Fixed bias.
30:
Cathode bias by Rk.
31:
Grid voltage referred to mid-point of AC-operated filament.
32:
Directly heated thoriated tungsten filamentary cathode.
33:
Tetrode Connection - Grid no.3 tied to plate.
-
34:
Operation with cathode bias (self bias) by Rk is recommended.
A utiliser de préférence en polarisation automatique.
35:
Frequency Doubler.
36:
Frequency Tripler.
37:
With quick-heating filamentary cathode.
38:
The maximum grid-circuit resistance for contact-potential-bias operation is 25 MOhm.
39:
The indicated plate current has to be adjusted by a variable cathode bias resistor.
40:
Originally this tube was manufactured with a glass bulb diameter of maximum 16.5 mm.
Later versions are provided with the standard 7-pin miniature tube bulb of 19 mm diameter.
41:
Negative bias voltage Ug applied to grid circuit resistor Rg.
42:
Operated as triode: Screen grid g2 and suppressor grid g3 are tied to plate (anode).
43:
Operation with stabilized heater and plate voltage.
44:
Ug1 is an approximate value. Set zero-signal DC plate current separately for each tube.
45:
Overloading the tube, especially the screen grid, by too large input signals, has to be avoided by suitable precautions.
46:
RF single-sideband amplifier A3J - Zero-signal condition.
47:
RF single-sideband amplifier A3J - Single-tone operation.
48:
RF single-sideband amplifier A3J - Two-tone operation.
49:
Premium Tube.
Improved-reliability type with tight tolerances.
50:
RF linear amplifier A3 (telephony).
51:
Current and Power Ratings at Peak of Envelope.
Pout: Peak-Envelope Power (PEP) (with peak envelope conditions for a signal having a minimum peak-to-average power ratio of 2).
52:
Set the indicated zero-signal DC plate current by Ug1.
53:
Capacitors Ca and Ck have been chosen to give an output voltage of 0.8*Ua~ for a frequency of f1=100Hz.
For any other value of f1, multiply the values of Ca and Ck by 100/f1.
In the case of capacitor Ck, the values shown in the charts are for an amplifier with DC heater excitation; when AC is used, depending on the character of the associated circuit, the gain, and the value of f1, it may be necessary to increase the value of Ck to minimze hum disturbance.
It may be desirable to operate the heater at a positive voltage of from 15 to 40 volts with respect to cathode.
54:
The values of Cg, Ck, and Ca should be choosen as large as the low-frequency response does not have a significant drop.
55:
Voltage gain V at an output Ua~ of 2V[rms].
56:
To avoid hum modulation keep the AC-voltage component between heater and cathode as low as possible.
57:
Die Gittergleichspannung Ug= wird so eingestellt, dass der angegebene Katodenstrom Ik erreicht wird.
Adjust DC grid voltage input Ug= to obtain the indicated cathode current Ik.
58:
Both sections operating in push-pull.
59:
With internal neutralization.
60:
With weak internal neutralization for use in wide-range tunable amplifiers.
61:
The ratings of Ia and Ig2 are peak values and can be measured only under pulsed operating conditions. Attention has to be paid on not exceeding the maximum ratings of Pa and Pg2.
62:
Cathode: thoriated carbonized tungsten filament.
63:
Oxide-coated cathode.
64:
Capacitively bypassing the resistor Rg2 is not allowed due to overloading the screen grid.
65:
Forced-air cooling.
66:
Conduction cooling.
67:
When using full maximum ratings.
68:
Second unit cut-off by Ug1 of -100V.
69:
Bei Einstellung der Gittervorspannung müssen Gitterstrom und Sekundäremission berücksichtigt werden.
Allow for contact potential and secondary emission in bias voltage adjustment.
70:
Glass tube with shoulder-type (ST) bulb.
71:
Glass tube with tubular (T) bulb.
72:
Strengthened mount structure to reduce microphonic effect.
73:
Tube with remote-cutoff characteristic.
74:
Absolute maximum ratings.
75:
Design-maximum ratings.
76:
Glass tube with metal shell.
77:
Glass tube with external anode using forced-air cooling.
A weak airflow is necessary to keep the seals below maximum temperature.
Cooling has to be provided prior to the application of filament power and has to be continued for three minutes after the power has been removed from the filament.
78:
Cathode bias is not recommended.
79:
Glass tube with external shield.
80:
Screen grid g2 used as input tied via Rg to control grid g1.
81:
Total Harmonic Distortions k with zero-impedance driving signal source.
82:
Common grid-leak resistor Rg1 (Rg1g1).
83:
Fixed bias or common grid-leak resistor are not recommended.
84:
Thoriated tungsten-mesh cathode.
85:
Coupling capacitors (Cg1, Ca) should be selected to give the desired frequency response.
Rk and Rg2 should be adequately bypassed (Ck, Cg2).
86:
Coupling capacitors (Cg, Ca) should be selected to give the desired frequency response.
Cathode resistor Rk should be adequately bypassed (Ck).
87:
For the prevention of parasitic oscillation, always connect a resistor of 100 to 300 ohms close to the screen grid terminal of the valve holder.
A control grid (stopper) resistor of 10,000 ohms to 50,000 ohms is also recommended.
88:
For the prevention of parasitic oscillation, always connect a resistor of 100 to 300 ohms between screen grid and anode close to the terminals of the valve holder.
A control grid (stopper) resistor of 10,000 ohms to 50,000 ohms is also recommended.
89:
The use of a common auto-bias resistor is not recommended except in applications where the maximum anode dissipation is not attained under any condition of operation.
90:
Stabilised screen supply voltage.
91:
In push-pull applications showing a large change in anode current between the quiescent and full output conditions, a choke input smoothing circuit having a good regulation should be used.
A badly regulated supply will lead to a fall in power output and/or excessive quiescent anode dissipation.
92:
Design centre ratings.
93:
Only during heater warm-up time.
94:
It is essential to use two separate cathode bias resistors due to the high mutual conductance.
95:
The distortion may vary accordingly to matching of pairs.
96:
It is essential to provide two separately adjustable bias voltage sources, having a voltage adjustment range of ±50%.
97:
Ultra-linear connection with grid No.2 tapped at 40% plate signal voltage of the primary winding.
98:
Glass-metal tube with plate radiator using forced-air cooling.
99:
Metal-Ceramic tube with plate radiator using forced-air cooling.
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