Mic Kaczmarczik's TubeInformation - The Blue Guitar

4. The first grid voltage -35 V
5. Resistance in the first grid circuit 0.5 Mohms
6. The first grid alternative current, effective, 9.8V;
resistive in a plate tuned circuit 2.5 kohms
7. Heater voltage 5.7 V
8. Cathode-to-heater voltage +- 250V
9. Heater voltage 7 V
10. The first grid voltage -100 V
11. The first grid voltage -200 V
12. All the other electrodes are free
3.2 Electric Characteristics Changing During Operation
Parameters, units Rate
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The first grid reverse current, uA, max 4
Output power at normal ambient temp, W, min 4.5
Plate current instability at high ambient
temperature 358 K, % , max +- 25
3.3 Maximum Ratings
Rate Rate
up to up to
Parameters, units 500 hrs 5000 hrs
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Heater voltage, V:
min 5.7 6
max 7 6.6
Plate voltage, V, max 250 250
The second grid voltage, V, max 250 250
Cathode-to-heater voltage:
of positive polarity V, max 90 90
of negative polarity V, max 200 200
Cathode current, mA, max 90 90
Plate dissipated power, W, max 20.5 20.5
The second grid dissapted power, W, max 2.75 2
Resistance in the first grid circuit, Mohms, max 0.5 0.5
Envelope temperature in the most heated
part against the plate, K, max 483 483
4. OPERATING INSTRUCTION
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4.1 It is not advisable to use the tube in heater series connection
circuit in order to secure tube reliability.
4.2 Heater voltage should not exceedits nominal value in order to
increase parameter instability and operating time.
4.3 The second grid voltage must never exceed (even for a short
time) the maximum rating and voltage applied to the plate at
a given moment.
4.4 If it is possible one should use automatic bias by means of
including resistance of an appropriate value in the cathode circuit.
4.5 In any case resistance in control grid circuit must be confined
to the possible minimum.
4.6 When mounting panels one should provide free floatinging of terminals
in sockets. Panel mounting must be realized by means of a mounting
gadget inserted in a panel; or one may use a tube with straight and
parallel pins.
4.7 It is not allowed to use tube free socket lugs as support mounting
points.
4.8 It is recommended to provide the minimum envelope temperature (e.g.
ventilation improvement, practical tube placement in units, application
of heat sinking panels and screens).
4.9 When operation the tube it is recommended to keep within the values
specified by the absolute maximum ratings. Otherwise the tube will
become inoperative.
4.10 It is not allowed to combine envelope temperature more than 453 K
and heater voltage more than 6.3 V.
5. STORAGE
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